The 4.4′-benzidine rearrangement of 4-alkyl substituted hydrazobenzenes
作者:Marc E. Bouillon、Hartmut H. Meyer
DOI:10.1016/j.tet.2016.03.103
日期:2016.6
When treated with dilute inorganic acids N,N′-diarylhydrazines (hydrazobenzenes) with an alkyl substituent in the 4-position undergo [5,5]-sigmatropic rearrangement reactions to furnish 4-(4′-aminophenyl)-4-alkylcyclohexa-2,5-dienimines (ipso-benzidines) in moderate to excellent yields. Steric bulk of the 4-alkyl substituent in the starting material decreases the yield of the respective ipso-benzidine