New silyl-substituted phosphaalkenes Mes*Pdouble bond; length as m-dashC(Cl)–Si(Cl)PhR, promising building blocks in silicon and phosphorus chemistry

Three new silyl-substituted phosphaalkenes Mes*Pdouble bond; length as m-dashC(Cl)–Si(Cl)PhR (R = chlorine, 1; R = 9-methylfluoren-9-yl, 2; R = 9-trimethylsilylfluoren-9-yl, 3) were obtained and completely characterized. The coordination compounds 4 and 5, resulting from the reaction between Au(SMe2)Cl and 1 and 3, respectively, are also described. All these compounds are potential precursors of phosphasilaallenes, not stabilized until now and new ligands in transition metal chemistry.