Acetylketene dialkyl acetals and a process for their preparation

Details Acetylketene dialkyl acetals and a process for their preparation Acetylketene dialkyl acetals and a process for their preparation

1987-12-28

1989-04-25

Reamer, James H.

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

Organic compounds

Oxygen containing

568415, C07C 4564

Patent

active

048250082

ABSTRACT:
The invention relates to a process for the preparation of acetylketene dialkyl acetals of the formula CH.sub.3 CO--CH.dbd.C(OR.sup.2).sub.2 in which R.sup.2 can be an alkyl radical with 1 to 12 carbon atoms, and also these compounds themselves, providing that R.sup.2 is an alkyl radical with 3 to 12 carbon atoms. In the preparation process an alkyl acetoacetate of the formula CH.sub.3 CO--CH.sub.2 COOR.sup.1 is reacted with a saturated primary or secondary alcohol R.sup.2 OH in the presence of an acid catalyst, in which R.sup.2 has the abovementioned meaning and in which R.sup.2 OH or is higher boiling than R.sup.1 OH.

REFERENCES:
patent: 2570713 (1951-10-01), Richmond
patent: 3932520 (1976-01-01), Hoffmann
Hiroyama et al, Chem. Abst; vol. 86, #171491r (1977).
Chirila, Chem. Abst; vol. 88, #22780y (1978).
McElvain et al, "Mechanism of the Reaction of Ketene Acetal with Various Halides", J. Amer. Chem. Soc. 74, 2662-2667 (1952).

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