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 phenylisocy anate via a Wittig process to afford either enynyl or keteniminyl comp lexes; [Ru(=C=C=CPh(2))(PPh(3))(2)(eta-C9H7)][PF6] undergoes regiosele ctive nucleophilic attacks at C-gamma by the anionic species [M(CO5)=C (OMe)CH2]-(M=Cr, Mo, W) to yield binuclear alkynyl-carbene complexes C 9H7)(PPh(3))(2)Ru-C=C-CPh(2)-CH2-C(OMe)=M(CO)(5)] which are the precur sors of the first vinylidene-carbene bimetallic cationic derivatives P h(3))(2)Ru=C=C(H)-CPh(2)-CH2-C(OMe)=M(CO)(5)]+(.)