Sensitive nature of ligand coupling and pseudorotation to electronic effect of substituent---ligand coupling in the reactions of benzylic aryl sulfoxides with benzylic Grignard reagents
Unlike the reaction of benzylic 2-pyridyl sulfoxides with benzylic Grignardreagents, in the reaction of p-benzenesulfonylphenyl benzylic sulfoxides with benzylic Grignardreagents, benzylic groups bearing an electron-withdrawing group tends to couple with the aryl group preferentially. This change is considered to be due to a slight change of electronic environements which would effect on the ease