Abstract
New methoxycarbene ruthenium(II) complexes and the allenylidene [Ru(η5-C9H7){CCC(C12H8)}{P(OEt)3}(PPh3)][PF6], bearing the phoshite P(OEt)3 as auxiliary ligand, have been isolated and characterized. Nucleophilic attacks to the allenylidene chain lead, regioselectively, to allenyl or alkynyl complexes, depending on the nucleophile and the reaction conditions. Thus, the reaction with the anionic nucleophile NaSMe leads to the allenyl complex [Ru(η5-C9H7){C(SMe)CC(C12H8)}{P(OEt)3}(PPh3)]. However, when neutral phosphanes are used, novel alkynyl complexes [Ru(η5-C9H7){CC–C(PR3) (C12H8)}{P(OEt)3}(PPh3)] were obtained.
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