A homonuclear π-system with a singlet carbene-type α and a nucleophilic β phosphorus – the first use in P-heterocyclic synthesis

Abstract

A μ₂-(η¹,η²)-dinuclear diphosphene complex having two W(CO)₅ groups with dimethyl acetylenedicarboxylate, 4-phenyl-1,2,4-triazoline-3,5-dione and diethyl azodicarboxylate was applied to P-heterocyclic synthesis, i.e., using a singlet carbene-type reactivity of a homonuclear π-system assisted by a haptotropic shift thus rendering a more nucleophilic β phosphorus and, hence, a subsequent ring expansion.