Question

Draw the Fischer-projection formula of D-glyceraldehyde

Answer 1

H-C=O
|
H-C-OH
|
CH2OH
The bond is between C- atoms.

Answer 2

In regard to the illustration of the three-dimensional structure of chiral molecules, one must confirm to a few rules, so that the configuration can be unequivocally interpreted from a two-dimensional drawing. For that matter, the Fischer projection, already introduced by Emil Fischer in 1891, is still in use today, particularly in the case of carbohydrates and amino acids.Fig.1D-glyc­er­alde­hydeIn order that the Fischer projection may be obtained, the longest continuous carbon chain must first of all be arranged in the overall eclipsed conformation. Subsequently, the chain is vertically aligned in such a way that the highest oxidized carbon atom is located at the top (COOH > CHO > CH2OH >CH3). The chain is then rotated around a vertical axis, so that the vertical bonds of the carbon chain point away from the viewer, while the horizontal bonds of the substituents point towards the viewer. All bonds are illustrated as unbroken lines. In the end, the molecule is projected (flattend) onto the plane (paper or blackboard).