Reinvestigation of the Vilsmeier-Haack Formylation of Triphenylamine

Abstract

Two previously claimed results on the Vilsmeier-Haack formylation of triphenylamine were demonstrated to be in error and the unambiguous reproducible procedures were developed to prepare 4-formyltriphenylamine (3) and 4,4'-diformyltriphenylamine (4), respectively, in good yields.