UNIT II: PROSTEREOISOMERISM AND CONFORMATIONAL STUDY 15 hrs.
Topicity and Prostereoisomerism: topicity of ligands and faces – homotopic ligands and faces
– enanatiotopic ligands and faces – diastereotopic ligands and faces – nomenclature of
stereoheterotopic ligands and faces – symbols for stereoheterotopic ligands and faces –
prostereoisomerism and stereoisomerism – chemical and biochemical transformation of
stereoheterotopic ligands and faces – molecules with one prochiral center – Re and Si system
of nomenclature for ligands.
Conformations of cyclic systems – conformation of monosubstituted cyclohexanes –
disubstituted cyclohexanes: typical – atypical disubstituted cyclohexanes – conformation of
polysubstituted cyclohexanes – conformation of fused bicyclic ring systems: decalins –
conformational study of fused polycyclic ring systems: perhydrophenanthrenes –
perhydroanthracenes – structure and nomenclature of bridged ring systems.
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