Reactions of cyano(alkynyl)ethenes with some alkynyl- and diynyl-ruthenium complexes

Reactions of Ru(CCPh)(PPh3)2Cp with (NC)2CCR1R2 (R1 = H, R2 = CCSiPri38; R1 = R2 = CCPh 9) have given η3-butadienyl complexes Ru{η3-C[C(CN)2]CPhCR1R2}(PPh3)Cp (11, 12), respectively. Deprotection (tbaf) of 11 and subsequent reactions with RuCl(dppe)Cp and AuCl(PPh3) afforded binuclear derivatives Ru{η3-C[C(CN)2]CPhCHCC[MLn]}(PPh3)Cp [MLn = Ru(dppe)Cp 19, Au(PPh3) 20]. Reactions between 8 and Ru(CCCCR)(PP)Cp [PP = (PPh3)2, R = Ph, SiMe3, SiPri3; PP = dppe, R = Ph] gave η1-dienynyl complexes Ru{C[C(CN)2]CRCH[CC(SiPri3)]}(PP)Cp (15-18), respectively, The phthalodinitrile C6H(CCSiMe3)(CN)2(NH2)(SiMe3) (10) was obtained serendipitously from (Me3SiCC)2CO and CH2(CN)2.