Steric substituent constant Ωsbased on molecular mechanics calculation. II. Directionally weighted steric constants and their application to the analysis of the steric course of reactions

摘要

AbstractThe directionally weighted steric substituent constant Ωjkwas introduced to evaluate the anisotropic steric hindrance effect to the reaction centre. The correlation of the rates with a series of directionally weighted Ωjkis useful for characterizing the feature of steric effect. The difference between the hydrolyses of carboxylic esters and carboxamides was shown by this metho