Method for purifying silyl ketene acetals

Details Method for purifying silyl ketene acetals Method for purifying silyl ketene acetals

1993-02-08

1993-09-21

Shaver, Paul F.

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

Organic compounds

Silicon containing

556446, 556448, C07F 708, C07F 718

Patent

active

052471128

ABSTRACT:
The present invention is a method for separating silyl ketene acetals from carbonyl by-products having a terminal olefinic bond and a boiling point similar to that of the silyl ketene acetals. The method employs a platinum catalyst which specifically effects hydrosilation of the carbonyl by-product's terminal olefinic bond by an organohydrosilane. The platinum catalyst is the reaction product of hexachloroplatinic acid and sym-tetramethyldivinyldisiloxane. In a preferred method the silyl ketene acetal is separated from the hydrosilated carbonyl by-product by distillation.

REFERENCES:
patent: 4746750 (1988-05-01), Revis
patent: 4824981 (1989-04-01), Schulz et al.
Ojima et al., J. Organomet. Chem. 111:43-60 (1976) "Hydrosilylation of .alpha..beta.-unsaturated Nitriles and Esters catalyzed by tris(triphenylphosphine) chlororhodium".
Howe et al., J. Organomet. Chem. 208:401-406 (1981) "Rhodium(II) Complexes as Hydrosilylation and Hydrogenation Catalysts".

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