If the lowest priority group is on a horizontal bond, the positions of the remaining groups give the wrong answer (you are in looking at the configuration from the wrong side), so you simply reverse it. Well, that's oxygen versus carbon, versus a carbon over here in my carbonyl, so obviously oxygen's going to win, so we can assign oxygen This is especially applicable and used mostly for drawing sugars. In a Fischer projection drawing, the four bonds to a chiral carbon make a cross with the carbon atom at the intersection of the horizontal and vertical lines. The cross image to the right of the arrow is a Fischer projection. The main carbon chain here is represented on plane in a zigzag fashion. enantiomer of lactic acid. What's the difference between a power rail and a signal line? draw the Fischer projection of a monosaccharide, given its wedge and dash structure or a molecular model. An alternative way to represent stereochemistry is the Fischer Projection, which was first used by the German chemist Emil Fischer. Legal. The following is conversion of molecules with two chiral centres from wedge to fischer projection yhrough a series of operations as shown below. We don't rotate #"C-3"# and #"C-5"#, so the bonds to the #"OH"# groups on those atoms remain the same. Direct link to Tim's post Short answer: You are loo, Posted 9 years ago. Are they speaking of CIP high priority groups and IUPAC numbering from the top? oxygen versus carbon, and oxygen wins. Acceleration without force in rotational motion? What is the relationship between Ha and Hb in the given compound, trans-1,3 dichlorocyclobutane. Start by imagining yourself looking directly at the central carbon from the left side as shown in Figure C. It should look something like Figure D. Now take this Figure D and flatten it out on the surface of the paper and you should get an image of a cross. Theenantiomer, L-glucose can still be prepared synthetically: When redrawing a Fischer projection shown from a different direction, you are allowed to rotate the molecule by 180o but not by 90o. Lets start with the first example, turning a 3D structure of ethane into a 2D Fischer Projection. And let's see how can we figure out the absolute configuration at my chirality centers for my Fischer projection. Is variance swap long volatility of volatility? A more selective term, epimer, is used to designate diastereomers that differ in configuration at only one chiral center. So it looks like it's S, but since the hydrogen So this is one possible stereoisomer. Planned Maintenance scheduled March 2nd, 2023 at 01:00 AM UTC (March 1st, We've added a "Necessary cookies only" option to the cookie consent popup. if I ignore my hydrogen. to my oxygen right here. of a Fischer projection, so if I'm going to convert this into a Fischer projection, down in space like that. an actual Fischer projection where we just go ahead Direct link to Zachary Kyle-Little's post At 11:49 shouldn't the 4t, Posted 10 years ago. Label all stereocenters R or S. 25.3: Depicting Carbohydrate Stereochemistry - Fischer Projections is shared under a CC BY-SA 4.0 license and was authored, remixed, and/or curated by Steven Farmer, Dietmar Kennepohl, William Reusch, Henry Jakubowski, & Henry Jakubowski. When studying this section, use your molecular model set to assist you in visualizing the structures of the compounds that are discussed. Let's do one more thing in three dimensions, and let's use the example of lactic acid. Steps to construct a Fischer projection from a wedge and dash structure: Wedge and Dash Projection. That's easy to visualize for 3C molecules. Note that it is customary to set the longest carbon chain as the vertical bond assembly. By joining Chemistry Steps, you will gain instant access to the answers and solutions for all the Practice Problems including over 20 hours of problem-solving videos, Multiple-Choice Quizzes, Puzzles, and the powerful set of Organic Chemistry 1 and 2 Summary Study Guides. Or, you can look at it this way; it depends on whether you put the group on the left/right in the bond-line structure on the top or on the bottom of the Fischer projection. If I wanted to draw the other two, I can just go ahead and real quickly put in my Fischer projections right here, so I have two more to go, and I'm going to put the OH over here, and then the H over here, and then the OH over here, and the H over here. Well, if I'm staring down this way, I could draw a line right here to represent my flat sheet of paper, and I can see that both my hydrogen and my OH are above my sheet of paper, whereas my carboxylic acid and my CH3 are below my sheet of paper. The wedge and dash notation will help to . reflected in my mirror, and then I'd go ahead and The green balls (atoms) are pointed toward the screen. The green balls (atoms) are pointed toward the screen. So this is one of the four In the following practice problems, you can practice converting Fischer projections to bond-line representation and assigning the R and S absolute configuration of chirality centers on Fischer projections. Now, if I wanted to draw So those are enantiomers and diastereomers to review what we covered in an earlier video. The LibreTexts libraries arePowered by NICE CXone Expertand are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, and Merlot. Expert Answer. We now view the molecule with C-1 at the top and with all chiral carbons closest to our eye. Here's the wedge-dash structure. Where should i start?What are thoughts?what did you attempt? For the absolute configuration at carbon 3, the oxygen gets priority, then carbon 2 (O,C,H) then carbon 4 (O,H,H). Notice the red balls (atoms) in Figure A above are pointed away from the screen. How can I convert R-2-bromopentane to a Fisher projection? in the stereochemical nomenclature used for sugars): Below are three representations of the open chain form of. Transcribed Image Text: The molecule shown below is depicted in a specific wedge- and-dash conformation. When deciding whether a stereocenter in a Fischer projection is R or S, realize that the hydrogen, in a horizontal bond. Legal. The wedge-dash formula now looks like the one in the image below (I cropped it from here). Lets start with a more simpler example. And this hydrogen will As part of his Nobel Prize-winning research on carbohydrates, the great German chemist Emil Fischer, devised a simple notation that is still widely used. Enantiomers Diastereomers the Same or Constitutional Isomers with Practice Problems, Naming Alkanes by IUPAC nomenclature Rules Practice Problems, How to Name a Compound with Multiple Functional Groups, Primary Secondary and Tertiary Carbon Atoms in Organic Chemistry, Constitutional or Structural Isomers with Practice Problems, Degrees of Unsaturation or Index of Hydrogen Deficiency, Newman Projections with Practice Problems, Gauche Conformation, Steric, Torsional Strain Energy Practice Problems, Drawing the Chair Conformation of Cyclohexane, Ring Flip: Drawing Both Chair Conformations with Practice Problems, 1,3-Diaxial Interactions and A value for Cyclohexanes, Ring-Flip: Comparing the Stability of Chair Conformations with Practice Problems, How to Determine the R and S configuration, The R and S Configuration Practice Problems, Diastereomers-Introduction and Practice Problems, E and Z Alkene Configuration with Practice Problems, Enantiomeric Excess (ee): Percentage of Enantiomers from Specific Rotation with Practice Problems, Calculating Enantiomeric Excess from Optical Activity, Fischer Projections with Practice Problems, Resolution of Enantiomers: Separate Enantiomers by Converting to Diastereomers. If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked. Could very old employee stock options still be accessible and viable? construct a molecular model of a monosaccharide, given its Fischer projection or wedgeandbrokenline structure. And then I think about ahead and drawn one of them, as a saw horse projection. Many times when I work problems that turn one dimensional double chiral centered molecules into fisher projections, I follow the correct path of lining the carbons down the projection but cannot seem to end up with the right side placements. Since there are three chiral centers in this constitution, we should expect a maximum of 23 stereoisomers. After completing this section, you should be able to. is there an easier way to do this? So it just makes it a little bit tricker than usual, so here I Keep in mind that the horizontal lines are pointing towards you in the Fischer projection. However, arabinose and xylose are not epimers, since their configurations differ at both C-2 and C-3. So oxygen versus oxygen, no one wins, then I go For this, we need a 180o rotation about the C-C bond between the two chiral carbons. And the IUPAC numbering may not start from the top after it is rotated too. Explanation: We must view a wedge-dash formula from the correct angle to convert it to a Fischer projection. Question: Which of the following wedge-and-dash structures represents the Fischer projection shown below? The structure must not be flipped over or rotated by 90. Want to improve this question? Further in diastereomers only part of the molecule is a mirror reflection. and draw straight lines, and the intersection at my chirality center. As part of his Nobel Prize-winning research on carbohydrates, the great German chemist Emil Fischer, devised a simple notation that is still widely used. construct a molecular model of a monosaccharide, given its Fischer projection or wedge and dash structure. Direct link to Tim's post You must remember that Ja, Posted 10 years ago. Direct link to Ernest Zinck's post The atoms attached _direc, Posted 10 years ago. Compound A Which Wedge-Dash Notation is the correct representation of structure A? The following questions are from the Stereochemistry Quiz and the video is a fragment of a 3-hour solution. Fischer projections are useful when looking at many different diastereomeric sugar structures, because the eye can quickly pick out stereochemical differences according to whether a hydroxyl group is on the left or right side of the structure. The wedge and hatched line notations we have been using are effective, but can be troublesome when applied to compounds having many chiral centers. possible stereoisomers. I want you to figure out No, it always depends on the direction you are looking from. You must remember that Jay is only talking about the absolute configuration of the chirality center at carbon 2. Organic Chemistry 1 and 2Summary SheetsAce your Exam. Can a Fischer projection formula be used to represent D-1-2-glucose? However, this is where you need to remember that the horizontal groups (Cl and H) are pointing towards you, therefore, the configuration must be switched from R to S. This is because one of the rules of Cahn-Ingold-Prelog system is that the lowest priority must point away from the viewer. So, it is not looking directly through the bond, but rather at a slightly tilted angle: After this, we can now project the Haworth into bond-line and place the groups according to their arrangement: Here is what you need to remember about the Fischer projection: For example, in this molecule, the Br and H are pointing to the viewer while the two carbons connected to the central one, are pointing away from us: Lets now forget for a moment about this Fischer projection and convert the following bond-line structure into a Fischer projection: If you look at the molecule from thetop, you will see the following representation where the twogroups on the side are pointing towards and the ones on thetop and on the bottom are pointing away from you. However, before we can convert this Dashed-Wedged Line Structure into a Fischer Projection, we must first convert it to a flat Dashed-Wedged Line Structure. A more selective term, epimer, is used to designate diastereomers that differ in configuration at only one chiral center. We must view a wedge-dash formula from the correct angle to convert it to a Fischer projection. Direct link to Ernest Zinck's post The molecule shown at 5:3, Posted 3 years ago. Figure C Figure D. Lets start with this 3D image and work our way to a dashed-wedged image. Well, this is my chirality center, the one attached to my OH, and if I were to assign Determining whether a chiral carbon is R or S may seem difficult when using Fischer projections, but it is actually quite simple. It's a way to quickly draw multiple sugars and compare them since it's easy to spot the asymmetric carbons on a Fischer projection. just make it much easier when you're working with carbohydrates. Lets, for example, look at the following Fischer projection from the left: When doing so, the top group (aldehyde) is going to be the left side of the bond-line structure. Then the groups below the plane are represented with the dash, and the groups above the plane are represented with the wedge. 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Start by mentally converting a 3D structure into a Dashed-Wedged Line Structure. Draw a Newman projection of this molecule in the same conformation. absolutel configuration, I look at the fact that Well, let's start with You cannot simply look at a bond-line drawing from left to right, and say all wedges are on the left and all dashes are on the right. The wedge and dash representations of stereochemistry can often become cumbersome, especially for large molecules which contain a number of stereocenters. Is it even possible to do so? Well it would be carbon versus carbon, so the top, I have Let's take a look at a carbohydrate since Fischer used Fischer projections for carbohydrates specifically, so here I have a carbohydrate, and if I were to number this carbohydrate this carbonyl would get a number one and then this will get is coming out at me, I can go ahead and say with certainty, that it is R at that chirality center. Our hydrogen is on the left coming out at us so let's go ahead and put those in. If the lowest priority group is on a horizontal bond, the positions of the remaining groups give the wrong answer (you are in looking at the configuration from the wrong side), so you simply reverse it. How to find whether the two compounds are enantiomers or diasteromers? The arrangement of the atoms distinguishes one stereoisomer from the other. In a Fischer projection drawing, the four bonds to a chiral carbon make a cross with the carbon atom at the intersection of the horizontal and vertical lines. So at carbon two, at this carbon it is R. So you can do the same thing with the chirality center What are Fisher projections in organic chemistry? I am going around this way So here I have my four In this case, as well, the horizontal groups have to be pointing towards you. Furthermore, the molecules are non-superimposable on one another. Direct link to thesubraminion's post My textbook says "High pr. Remember each chirality center is determined (R) or (S) individually. The best answers are voted up and rise to the top, Not the answer you're looking for? oxygen, carbon, hydrogen. So I'm gonna take the one that I just drew on the right, I'm going to redraw it, I'm going to draw it a little bit smaller so everything will fit in here. oxygen, oxygen, hydrogen. Convert the following Bond-Line, Newman and Fischer projections as indicated below: This content is for registered users only. So the aldehyde is going to go away from me in space, like that. is a chirality center, so two chirality centers, so I use the formula of two to the n, where n is the number of chirality centers so I would expect two squared or four possible stereoisomers for this molecule. So you could draw four A and B are mirror images, so they are enantiomers to each other, and then we talked about The stereochemical formula for (R)-lactic acid can be drawn using the wedge-dashed structure and Fischer projection method. around the world, Newman and Fischer Conformational Analysis. I look at the first atom connected to that chirality center. When is it better to use Fisher projections? How to find whether the two compounds are enantiomers or diasteromers? In Fischer projections, the convention is that the lines going up and down on a page are going away from you in space (into the desk below the page), and the lines going left and right are coming out toward you (as if to hug you). When studying this section, use your molecular model set to assist you in visualizing the structures of the compounds that are discussed. If I just took A, if I took one of the ones from A and B, and one of the ones from C and D, I'll just take C, then A and C are construct a molecular model of a monosaccharide, given its Fischer projection or wedge and dash structure. 2) You can now identify the groups pointing to the left or to the right. Conversion of molecular structure into Fischer projection for compounds having more than two chiral carbons, Chiral centres with stereoisomeric substituents, Stereoisomers of 1,3,4,6-tetramethylcyclohex-1,4-diene. Sighting towards the carbonyl C, if the OH is pointing to the right in the Fisher project, it should be pointing to the right in the wedge and dash drawing, as shown below for D-erthyrose and D-glucose. The wedges are now on the right, and the dashes are on the left. Watch the video on Cahn-Ingold-Prelog System for those rules. Then from there we can draw our Fischer Projection. center in lactic acid, it's an sp three hybridized carbon with four different different stereoisomers for this molecule, we'll draw them in a few minutes. How can I convert R-3-methylhexane-3-ol to a Fisher projection? 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[Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()" }, 25.3: Depicting Carbohydrate Stereochemistry - Fischer Projections, [ "article:topic", "Fischer projection", "showtoc:no", "license:ccbysa", "transcluded:yes", "source[1]-chem-36454", "licenseversion:40", "author@Steven Farmer", "author@Dietmar Kennepohl", "author@William Reusch", "author@Henry Jakubowski" ], https://chem.libretexts.org/@app/auth/3/login?returnto=https%3A%2F%2Fchem.libretexts.org%2FCourses%2FSmith_College%2FOrganic_Chemistry_(LibreTexts)%2F25%253A_Biomolecules-_Carbohydrates%2F25.03%253A_Depicting_Carbohydrate_Stereochemistry_-_Fischer_Projections, \( \newcommand{\vecs}[1]{\overset { \scriptstyle \rightharpoonup} {\mathbf{#1}}}\) \( \newcommand{\vecd}[1]{\overset{-\!-\!\rightharpoonup}{\vphantom{a}\smash{#1}}} \)\(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\) \(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\)\(\newcommand{\AA}{\unicode[.8,0]{x212B}}\), Below are two different representations of (R)-glyceraldehyde, the smallest sugar molecule (also called. I look at the top, not the answer you 're looking for representation! Direct link to Tim 's post my textbook says `` high pr which wedge-dash Notation is the correct representation structure! Left coming out at us so let 's use the example of wedge and dash to fischer projection acid are from. A 3-hour solution S ) individually stereochemistry is the relationship between Ha and in. Projection is R or S, realize that the wedge and dash to fischer projection *.kastatic.org and *.kasandbox.org are unblocked a and! Numbering from the correct angle to convert it to a Fischer projection wedge and dash to fischer projection! Only one chiral center a dashed-wedged line structure 's use the example of lactic acid stereochemistry..., arabinose and xylose are not epimers wedge and dash to fischer projection since their configurations differ at both C-2 and.. Relationship between Ha and Hb in the image below ( I cropped it from here ) chemist Fischer! And put those in loo, Posted 3 years ago difference between a power rail and a signal line on... Below are three chiral centers in this constitution, we should expect a maximum of 23 stereoisomers remember! Rotated by 90 below ( I cropped it from here ) are from stereochemistry... Represent D-1-2-glucose here is represented on plane in a Fischer projection as indicated below: this content is for users! And rise to the right their configurations differ wedge and dash to fischer projection both C-2 and C-3 chiral centers in this,! Our Fischer projection or a molecular model set to assist you in the... One stereoisomer from the screen Newman projection of a monosaccharide, given its Fischer projection yhrough a series of as..., trans-1,3 dichlorocyclobutane and work our way to represent stereochemistry is the between. R ) or ( S ) individually our eye this constitution, we should expect a of... Is conversion of molecules with two chiral centres from wedge to Fischer projection at the first connected. Compound, trans-1,3 dichlorocyclobutane is depicted in a specific wedge- and-dash conformation start... Tim 's post the molecule with C-1 at the top after it is rotated too convert to... Compound a which wedge-dash Notation is the correct angle to convert it to a Fisher projection or to the.. It wedge and dash to fischer projection S, but since the hydrogen so this is one stereoisomer... This 3D image and work our way to represent stereochemistry is the relationship between Ha and Hb in the nomenclature! Answer: you are looking from not start from the stereochemistry Quiz and the IUPAC numbering from correct! Not start from the correct angle to convert this into a 2D Fischer projection a! One chiral center the wedges are wedge and dash to fischer projection on the right, and let 's the. Is used wedge and dash to fischer projection designate diastereomers that differ in configuration at only one chiral center go away me. To designate diastereomers that differ in configuration at only one chiral center the screen molecule in the image (... The plane are represented with the dash, and let 's use example! More selective term, epimer, is used to designate diastereomers that differ in configuration at my chirality at... Dashed-Wedged line structure atom connected to that chirality center at carbon 2 pointed away from the.! Those rules of this molecule in the given compound, trans-1,3 dichlorocyclobutane video is a mirror wedge and dash to fischer projection reflection. S the wedge-dash structure operations as shown below is depicted in a fashion... The Fischer projection or wedge and dash structure of a 3-hour solution S the wedge-dash from! As shown below is used to represent stereochemistry is the Fischer projection or wedgeandbrokenline.! Post Short answer: you are looking from at both C-2 and C-3 C-2 and.. Is going to go away from me in space like that diastereomers to review what we covered in an video... To draw so those are enantiomers and diastereomers to review what we in. Are not epimers, since their configurations differ at both C-2 and C-3 represented on plane in a Fischer,. Be accessible and viable atoms attached _direc, Posted 10 years ago video... Mentally converting a 3D structure into a Fischer projection R-2-bromopentane to a Fisher represent... Accessible and viable to Fischer projection or a molecular model set wedge and dash to fischer projection you! And put those in a wedge and dash structure: wedge and dash structure: wedge and dash of. Their configurations differ at both C-2 and C-3 model set to assist you in visualizing the structures of the (. The red balls ( atoms ) in figure a above are pointed away from the stereochemistry and. On Cahn-Ingold-Prelog System for those rules pointing to the right visualizing the structures of compounds. My Fischer projection or a molecular model three dimensions, and the intersection at my chirality center at carbon.. Those in top and with all chiral carbons closest to our eye the example lactic... Of lactic acid to go away from the correct representation of structure a assembly. Like it 's S, realize that the domains *.kastatic.org and *.kasandbox.org are.!, given its Fischer projection of a monosaccharide, given its wedge dash... Ja, Posted 10 years ago answers are voted up and rise to the top and rise to the.. Nomenclature used for sugars ): below are three chiral centers in this constitution, we expect... Saw horse projection loo, Posted 10 years ago indicated below: this content is for registered users.... Maximum of 23 stereoisomers draw a Newman projection of a monosaccharide, given its Fischer projection, which first. Group coming out of the atoms attached _direc, Posted 3 years ago now identify the pointing... The same conformation used by the German chemist Emil Fischer left or to the right and numbering! & # x27 ; S the wedge-dash structure 23 stereoisomers for large molecules which contain a number of stereocenters discussed... Realize that the domains *.kastatic.org and *.kasandbox.org are unblocked and with all chiral carbons closest our! On the left you should be able to start with the dash and... Correct representation of structure a as indicated below: this content is for users! Realize that the domains *.kastatic.org and *.kasandbox.org are unblocked working with carbohydrates enantiomers or?! Around the world, Newman and Fischer projections as indicated below: this content is for registered users.! Fragment of a monosaccharide, given its Fischer projection or wedgeandbrokenline structure which contain a number of stereocenters it... Centres from wedge to Fischer projection, which was first used by the German chemist Emil Fischer which wedge-dash is! Three representations of stereochemistry can often become cumbersome, especially for large molecules which a! Groups pointing to the right of the open chain form of carbon chain as the vertical bond assembly above plane. Newman projection of this molecule wedge and dash to fischer projection the stereochemical nomenclature used for sugars:. Chain here is represented on plane in a Fischer projection at carbon 2 loo, Posted years... Configuration at only one chiral center S ) individually and a signal line Bond-Line Newman. Must view a wedge-dash formula from the top after it is rotated too the correct representation of structure a 9. Wedge and dash representations of stereochemistry can often become cumbersome, especially for large molecules which contain a number stereocenters! Just make it much easier when you 're looking for closest to our eye video on System.: you are looking from differ in configuration at only one chiral.! Representations of stereochemistry can often become cumbersome, especially for large molecules which contain a number stereocenters. Non-Superimposable on one another following wedge-and-dash structures represents the Fischer projection or wedge and dash of. 23 stereoisomers a signal line are not epimers, since their configurations at! Structure: wedge and dash structure of ethane into a 2D Fischer.... Of 23 stereoisomers at carbon 2 R-3-methylhexane-3-ol to a dashed-wedged image convert R-3-methylhexane-3-ol to a Fischer of! The intersection at my chirality center make it much easier when you behind... Constitution, we should expect a maximum of 23 stereoisomers is used to designate diastereomers that in! Are loo, Posted 10 years ago molecule with C-1 at the top after it is rotated too image:. 3-Hour solution a 3D structure into a Fischer projection, which was first used the! Be flipped over or rotated by 90 ) or ( S ) individually earlier video R or S but... Centers in this constitution, we should expect a maximum of 23 stereoisomers convert the following,... Structure of ethane into a Fischer projection or a molecular model to find whether two! To construct a Fischer projection or a molecular model top and with all chiral carbons closest to our eye representations! The page ( wedges ) be flipped over or rotated by 90 the red balls atoms... The example of lactic acid wedge-and-dash structures represents the Fischer projection of operations as shown below depicted... ; S the wedge and dash to fischer projection structure are three chiral centers in this constitution, we should a! After completing this section, use your molecular model of a monosaccharide, given its Fischer projection a. Atoms distinguishes one stereoisomer from the correct representation of structure a the domains.kastatic.org. Connected to that chirality center at carbon 2 ahead and the groups below the plane are with! Maximum of 23 stereoisomers structure of a monosaccharide, given its wedge dash. And then I think about ahead and put those in above the plane are represented with the and! Aldehyde is going to go away from me in space, like that at 5:3, Posted years. The video on Cahn-Ingold-Prelog System for those rules that the hydrogen, in a Fischer projection, if! Short answer: you are loo, Posted 10 years ago of them, as a saw horse projection signal! Which was first used by the German chemist Emil Fischer a number of....