Bei Chen, Fengting Liang, Haipeng Chen and Jianbo Wang
Direct competitions of intramolecular C–H insertions into benzylic C–H and 4-nitro and 4-methoxy substituted benzylic C–H by rhodium(II)-mediated carbenoids were investigated, and the relative reactivities obtained by direct competition were comparable to those obtained by a previously reported indirect method.