First proposed by George Hammond in 1955 , the postulate states that :
Hammond 's postulate ( or alternatively the Hammond -- Leffler postulate ) , is a hypothesis in physical organic chemistry which describes the geometric structure of the transition state in an organic chemical reaction .
First proposed by Hammond   in 1955 , the postulate states that :
Hammond 's postulate ( or alternatively the Hammond -- Leffler postulate ) , is a hypothesis in physical organic chemistry which describes the geometric structure of the transition state in an organic chemical reaction .