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Three-Dimensional Representations

Assigning Priorities

Determining Stereochemical Relationships

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Three-Dimensional Representations: Fischer Projections

Fischer Projections are used often in drawing sugars and hydrocarbons, because the carbon backbone is drawn as a straight vertical line, making them very easy to draw. When properly laid-out, Fischer Projections are useful for determining enantiomeric or diasteromeric relationships between two molecules, because the mirror image relationship is very clear.

In a Fischer Projection, each place where the horizontal and vertical lines cross represents a carbon. The vertical lines are actually oriented away from you (similar to dashes in the Wedge-Dash Notation) and the horizontal lines are oriented toward you (similar to wedges in the Wedge-Dash Notation).

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