New routes to molybdenum and tungsten carbyne complexes [M(CO)2(CPh)(η-C5H4R)](M = Mo or W, R = SnPh3; M = W, R = H)

Abstract

Treatment of the ethoxy carbenes [M(SnPh₃)(CO)₂{C(OEt)Ph}(η-C₅H₅)](M = Mo or W) with LDA or LDA/HMPA followed by PhC(O)Cl results in the carbyne complexes [M(CO)₂(CPh)(η-C₅H₄SnPh₃)]_via anions [M(CO)₂{C(OEt)Ph}(η-C₅H₄SnPh₃)]^–, while treatment of [W(SnPh₃)(CO)₃(η-C₅H₅)] with LiPh followed by TMEDA/MeC(O)Cl results in the carbyne [W(CO)₂(CPh)(η-C₅H₅)].