Combinatorial Approach to the Catalytic Hydrosilylation
of Styrene Derivatives: Catalyst Systems Composed of Organoiron(0)
or (II) Precursors and Isocyanides
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Abstract
(COT)<sub>2</sub>Fe and the open
ferrocenes (MPDE)<sub>2</sub>Fe
(MPDE = η<sup>5</sup>-3-methylpentadienyl) and (DMPDE)<sub>2</sub>Fe (DMPDE = η<sup>5</sup>-2,4-dimethylpentadienyl) were found
to function as catalyst precursors for the hydrosilylation of alkenes
in the presence of auxiliary ligands. Screening trials determined
that the optimal catalyst system was composed of (COT)<sub>2</sub>Fe and adamantyl isocyanide, allowing the selective hydrosilylation
of styrene derivatives with trisubstituted hydrosiloxanes and a polydimethylsiloxane
bearing Me<sub>2</sub>SiH moieties as the end groups. Under the appropriate
conditions, the dehydrogenative silylation side reaction was completely
suppressed, and the reaction TON exceeded 5000
