Nucleophilic additions to a diphosphirenium salt: ring opening and ring expansion reactions

Abstract

P-Bis(diisopropylamino)-C-diisopropylamino diphosphirenium tetrafluoroborate 1 reacts with lithium diisopropylamide and tert-butyl isocyanide affording phosphaalkene 3 and the original four-membered heterocycle 5;5 is characterized by X-ray diffraction and its chemical reactivity.