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Catalysis of hydrosilylation: Part XXIV. H 2 PtCl 6 in cyclohexanone as hydrosilylation catalyst—what is the active species in this catalytic system?
Author(s) -
Guliński J.,
Kłosin J.,
Marciniec B.
Publication year - 1994
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.590080415
Subject(s) - hydrosilylation , chemistry , cyclohexanone , catalysis , platinum , solvent , organic chemistry , polymer chemistry
A cyclohexanone solution of H 2 PtCl 6 was examined to find the catalytic species responsible for the hydrosilylation of the olefinic C=C bond. Similarly to other H 2 PtCl 6 –solvent systems (e.g. Speier's and Karstedt's catalysts), the real catalyst appeared to be colloidal platinum formed in situ by stepwise reduction [Pt(IV)→Pt(O)] and dechlorination of the platinum precursor. The role of cyclohexanone seems to be to form sufficiently stable platinum complexes to avoid rapid platinum precipitation and aggregation. The studies of H 2 PtCl 6 –solvent systems are of practical importance since these compounds are widely used catalyst precursors for hydrosilylation on an industrial scale.