Process for producing alpha, beta-unsaturated ketones

Details Process for producing alpha, beta-unsaturated ketones Process for producing alpha, beta-unsaturated ketones

1984-07-31

1986-03-11

Reamer, James H.

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

Organic compounds

Oxygen containing

568388, 560174, 560121, 560126, C07C 4565

Patent

active

045755701

ABSTRACT:
A process for producing alpha,beta-unsaturated ketones represented by the following general formula ##STR1## wherein R.sub.1 represents a hydrocarbon radical, R.sub.2 represents an organic radical bonded through a carbon-carbon bond, R.sub.3 and R.sub.4 represent a hydrogen atom or a hydrocarbon radical, and R.sub.1, R.sub.2, R.sub.3 and R.sub.4 may be straight-chained or form a ring in arbitrary combinations,
which comprises contacting an alpha-disubstituted-beta-keto acid ester represented by the general formula ##STR2## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are as defined, and R.sub.5, R.sub.6, R.sub.7 and R.sub.8 represent a hydrogen atom or a hydrocarbon radical,
with a catalyst consisting essentially of (a) a compound of a platinum-group metal and optionally (b) a monodentate ligand (b).

REFERENCES:
patent: 4496766 (1985-01-01), Tsuji et al.
Tsuda et al., J.A.C.S., vol. 102, pp. 6381-6384 (1980).
Isao Shimizu, et al., "Palladium-Catalyzed Decarboxylation-Dehydration of Allyl Beta-Keto Carboxylates and Allyl Enol Carbonates as a Novel Synthetic Method for Alpha-Substituted Alpha, Beta--Unsaturated Ketones," J. of Chem. Soc., 104 (1982), pp. 5844-5846.

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