Synthesis of substituted dibenzophospholes. Part 6. Preparation of symmetrical and non-symmetrical quaterphenyl intermediates

Abstract

Further examples are given of the synthetic approach to 4,6-diaryldibenzophospholes by arylation of 1,3-dinitrobenzene and coupling of the resulting biphenyls to symmetrically substituted quaterphenyls. Satisfactory procedures are described for the monoarylation of 2,2′,4,4′-tetranitrobiphenyl and for arylation of the products to provide non-symmetrically substituted tetranitroquaterphenyls. Some procedures for the regioselective alkoxydenitration of tetranitroquaterphenyls are described.