Ruthenium Tris(pyrazolyl)borate Complexes.Part 20 [1],Synthesis,Characterization,and Reactivity of Neutral Trispyrazolylborate Ruthenium Vinylidene Complexes

摘要

The reaction of RuTp(COD)Cl (1) with PPh_2Pr~i and terminal alkynes HC=CR (R = C_6H_5,C_4H_3S,C_6H_4OMe,Fc,C_6H_4-Fc,C_6H_9) affords the neutral vinylidene complexes RuTp(PPh_2Pr~i) (C1)(=C=CHR) (2a-2f) in high yields.These complexes do not react with MeOH to give methoxy carbene complexes of the type RuTp(PPh_2Pr~i)(Cl)(=C(OMe)CH_2R),but react with oxygen to yield the CO complex RuTp(PPh_2R)(Cl)(CO) (3).The structures of 2b,2f,and 3 have been determined by X-ray crystallography.