Chapter 20.4, Problem 20.12P

Interpretation Introduction

Interpretation:

The chiral carbons in ,  and  has to be identified.

Concept introduction:

Chiral carbon:

Chiral carbon is the one which is bonded to four different molecules or groups.

Monosaccharides:

• Monosaccharides forms cyclic hemiacetals, the oxygen atom in the  group of second last carbon (from bottom) attacks the carbonyl group of the same compound.
• The carbon atom in carbonyl group of monosaccharides is called anomeric carbon.
• Haworth projection is used to represent sugars in their cyclic hemiacetal forms.
• In Haworth projection,
• -indicates, the  group of anomeric carbon  and substituent on the  carbon is trans to each other.  -indicates, the  group of anomeric carbon  and substituent on the  carbon is cis to each other.