Syntheses and structural studies of several diynyl-ruthenium complexes and their adducts with cyano-alkenes

Abstract

<jats:title>Abstract</jats:title><jats:p>Herein are described some continuing investigations into the reactions of cyano‐alkenes with diynyl‐ruthenium complexes which have resulted in the preparation and characterisation of diynyl‐ruthenium compounds Ru(C≡CC≡C<jats:italic>R</jats:italic>)(PP)Cp [<jats:italic>R</jats:italic> = Ph, PP = dppe; <jats:italic>R</jats:italic> = Fc, PP = dppf; <jats:italic>R</jats:italic> = CPh=CBr<jats:sub>2</jats:sub>, PP = (PPh<jats:sub>3</jats:sub>)<jats:sub>2</jats:sub>], together with the polycyanobutadienyls Ru{C≡CC[=C(CN)<jats:sub>2</jats:sub>]C<jats:italic>R</jats:italic>=C<jats:italic>R</jats:italic>′(CN)}(PP)Cp′ [<jats:italic>R</jats:italic> = Fc, (PP)Cp′ = (dppf)Cp; <jats:italic>R</jats:italic> = H, SiMe<jats:sub>3</jats:sub>, (PP)Cp′ = (dppe)Cp*] formed by [2 + 2]‐cycloaddition of the cyano‐alkenes to the outer C≡C triple bonds and subsequent ring‐opening reactions. Single‐crystal XRD molecular structure determinations of six complexes are reported.</jats:p>