Allenylidene indenyl ruthenium(II) complexes as sources of highly functionalized alkynyl complexes: synthesis of the first bimetallic derivatives containing a vinylidene–carbene bridge

Abstract

The alkynylphosphonioruthenium(II) complex [Ru{–CC–C(PMe₃)(H)Ph}(PPh₃)₂(η–C₉H₇)][PF₆] reacts with aldehydes, ketones and phenylisocyanate via a Wittig process to afford either enynyl or keteniminyl complexes; [Ru(CCCPh₂)(P-Ph₃)₂(η-C₉H₇)][PF₆] undergoes regioselective necleophilic attacks at C_γ by the anionic species [M(CO₅)C(OMe)CH₂]-(M Cr, Mo, W) to yield binuclear alkynyl-carbene complexes [(η-C₉H₇)(PPh₃)₂Ru-CC-CPh₂-CH₂-C(OMe)M(CO)₅] which are the precursors of the first vinylidene–carbene bimetallic cationic derivatives [(η-C₉H₇)(PPh₃)₂RuCC(H)–CPh₂–CH₂–C(OMe)M(CO)₅]⁺.