Depicting Carbohydrate Stereochemistry: Fischer Projections A 90 rotation breaks the Fischer convention by exchanging the groups that go into and come out of the plane A 90 or a 270 rotation changes the representation to the enantiomer CH090 H OH Not HOCH2- -CHO same as CH2OH OH (R)-Glyceraldehyde (S)-Glyceraldehyde ▪ A 90° rotation breaks the Fischer convention by exchanging the groups that go into and come out of the plane ▪ A 90° or a 270° rotation changes the representation to the enantiomer Depicting Carbohydrate Stereochemistry: Fischer Projections