Transition metal compounds containing alkynylsilyl groups − complexes with a metal-silicon bond

Abstract

Two transition metal complexes containing alkynylsilyl groups and a metal−silicon bond (CpFe(CO)2SiMe2CCPh (1), Co(CO)4SiMe2CCPh (2)) have been synthesized by nucleophilic substitution (salt elimination) using both strongly and weakly nucleophilic metallates. No disturbing interactions of the metallate with the CC bond were observed. The synthesis of a third complex ((Ph3P)2RhClHSiMe2CCPh (3)) by oxidative addition was hampered by transition metal catalyzed reactions of the Si−H with the CC triple bond. The reactivity of 1 toward complexation and hydrosilylation of the CC triple bond was studied, leading to the trinuclear dicobaltatetrahedrane compound 1 ∗ Co2(CO)6 (4) and the vinylsilyl complex CpFe(CO)2SiMe2CH=CPh(SiEt3) (5), respectively. The complexes were characterized by NMR (1–5), IR (1–5), and UV/VIS spectroscopy (1, 3, 4) as well as X-ray crystallography (1–4).