STEREOCHEMISTRY

Part-IV

Nomenclature of Organic Compounds

B.Sc Hons (Chemistry)

Sem-I , Paper CC-1

Dr. Indranil ChakrabortyKharagpur College

Absolute Nomenclature

Flying Wedge

4/2 back + ve, 1/3 back –ve4/2 front – ve, 1/3 front + ve

Lowest priority group 1 to 2 to 3 Configuration

Back /Away from the viewer Clock wise R

Back /Away from the viewer Anti- Clock wise S

Front / Close to the viewer Clock wise S

Front / Close to the viewer Anti- Clock wise R

Even back + ve, Even front – veOdd back – ve, Odd front + ve

Relative Configuration

D/L system of nomenclature

Threo/ Erythro nomenclature