Method for preparing metallic carbene-based catalysts for...

Details Method for preparing metallic carbene-based catalysts for... Method for preparing metallic carbene-based catalysts for...

2006-03-28

2006-03-28

Nazario-Gonzalez, Porfirio (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C556S479000, C556S474000, C556S140000, C556S136000, C556S012000, C502S152000, C502S158000

Reexamination Certificate

active

07019145

ABSTRACT:
The invention concerns an improved method for preparing catalysts for hydrosilylation reactions of compounds with ethylene or acetylene unsaturation (for example olefins or acetylene derivatives), in particular but not exclusively those involving polyorganosiloxanes (POS) bearing Si—H units and POS bearing Si-(ethylene or acetylene unsaturation) units. Said preparation corresponds to the following synthesis (I), wherein: A=B=carbon: T1, T2=cyclohexyl, t-butyl or methyl; T3, T4=H; DVTMS=divinyltetramethylsiloxane; t-BuOK=potassium tert-butylate; T.A=room temperature. The invention is characterised in that it consists in carrying out said synthesis in a single step by bringing together salt (III) above, Karstedt (IV) in the presence of a solvent (V) (THF) and a base (VI) (t-BuOK) at room temperature.

REFERENCES:
patent: 2823218 (1958-02-01), Hook
patent: 2970150 (1961-01-01), Bailey
patent: 3775452 (1973-11-01), Karstedt
patent: 5359113 (1994-10-01), Bank
Enders et al., “Diastereoselective Systhesis of Chiral(triazolinylidene)rhodium Complexes Containing an Axis of Chirality,” Eur. J. Inorg. Chem. No. 7, 1998, pp. 913-919.

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