ALLENYLIDENE INDENYL RUTHENIUM(II) COMPLEXES AS SOURCES OF HIGHLY FUNCTIONALIZED ALKYNYL COMPLEXES - SYNTHESIS OF THE FIRST, BIMETALLIC DERIVATIVES CONTAINING A VINYLIDENE-CARBENE BRIDGE

The alkynylphosphonioruthenium(II) complex [Ru{-C=C-C(PMe(3))(H)Ph}(PPh(3))(2)(eta-C9H7)][PF6] reacts with aldehydes, ketones and phenylisocyanate via a Wittig process to afford either enynyl or keteniminyl complexes; [Ru(=C=C=CPh(2))(PPh(3))(2)(eta-C9H7)][PF6] undergoes regioselective nucleophilic attacks at C-gamma by the anionic species [M(CO5)=C(OMe)CH2]-(M=Cr, Mo, W) to yield binuclear alkynyl-carbene complexes [(eta-C9H7)(PPh(3))(2)Ru-C=C-CPh(2)-CH2-C(OMe)=M(CO)(5)] which are the precursors of the first vinylidene-carbene bimetallic cationic derivatives [(eta-C9H7)(PPh(3))(2)Ru=C=C(H)-CPh(2)-CH2-C(OMe)=M(CO)(5)]+(.)