Ch_322a_5.012

Ch_322a_5.012 - Fischer Projection Formulas Emil Fischer...

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Fischer Projection Formulas Emil Fischer (1852-1919), one of the most prominent German chemists of the late 19th and early 20th centuries, devised a convention for representing three-dimensional structural information in two dimensions. These "Fischer formulas" are especially helpful in keeping track of stereochemical details in structures with more than one stereocenter. Example: (R)-2-chlorobutane C H Cl CH 3 CH 2 CH 3 The Two-Dimensional Fischer Formula Draw vertical and horizontal crossing lines. The point of intersection is the stereocenter. The horizontal line represents bonds projected towards the viewer. H Cl The vertical line represents bonds projected away from the viewer. CH 2 CH 3 CH 3
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How to Use Fischer Formulas: (S,R)-2,3-Dibromobutane CH 3 -CH-CH-CH 3 Br Br * * By convention, Fischer formulas are written with the main chain extending top to bottom . C C CH 3 CH 3 Br Br H H (S,R)-2,3-Dibromobutane (meso) 3-dimensional representation CH 3 CH 3 Br Br H H Fischer Formula Note:
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This note was uploaded on 07/22/2009 for the course CHEM 322AL taught by Professor Jung during the Summer '07 term at USC.

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Ch_322a_5.012 - Fischer Projection Formulas Emil Fischer...

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