Metallacumulenes: preparation of novel alkenyl–allenylidene– and diynyl–ruthenium complexes. Crystal structure of a Ru–CC–CC–C(OSiMe3)Ph2 derivative

Abstract

Complexes (η⁶-arene)(PR₃)RuCl₂1 react with HCC–CC–CPh₂OX derivatives (X = H, SiMe₃) to afford, in alcohol or in the presence of HNPh₂, 3-alkenyl allenylidene complexes [(η⁶-arene)(PR₃)ClRuCCC(Y)CHCPh₂]⁺(Y = OEt 4a, OPrⁱ5a, NPh₂6) and diynyl–ruthenium derivatives in the presence of HNPrⁱ₂.