Phosphino and Phosphonito Carbyne Complexes: [Mo(≡CX)(CO)₂{HB(pzMe₂)₃}] (X = PPh₂, P(═O)(OEt)₂; pz = Pyrazol-1-yl)

Abstract

The phosphinocarbyne complex [Mo(≡CPPh2)(CO)2{HB(pzMe2)3}] is obtained by successive treatment of [Mo(≡CBr)(CO)2{HB(pzMe2)3}] with nBuLi and ClPPh2. An alternative approach to phosphorus-functionalized carbyne complexes involves the palladium-mediated reaction of [Mo(≡CBr)(CO)2{HB(pzMe2)3}] with diethylphosphinic acid to provide [Mo{≡CP(O)(OEt)2}(CO)2{HB(pzMe2)3}]. In contrast to aminomethylidynes, which typically display trigonal nitrogen centers, the phosphorus atom in [Mo(≡CPPh2)(CO)2{HB(pzMe2)3}] is pyramidalized.