Synthesis of the first stable Fischer-type carbene metal complex with a C-O-P structural motive of the carbene ligand

Fischer-type (phenyl)carbene pentacarbonyltungsten complexes, which have an organo phosphorus moiety bonded to oxygen (5, 8) or to nitrogen (10a,b), a re synthesized by reaction of the O-Li and N-Li precursor carbene complexes with either bis(diisopropylamino)chlorophosphane (5) and/or [bis(trimethyl silyl)methylene]chlorophosphane (8, 10a,b) via lithiumchloride elimination; whereas the bulky substituted complex 5 decomposed in solution under forma tion of bis(diisopropylamino) chlorophosphaneoxide via an unknown reaction pathway, complex 8 was stable at ambient temperature; complexes 10a,b slowl y rearranged in solution to the 2H-azaphosphirene complex 11; the complexes 8 and 10a,b were unambiguously confirmed by NMR spectroscopy. (C) 2000 Els evier Science B.V. All rights reserved.