Process for the preparation of ketals

Details Process for the preparation of ketals Process for the preparation of ketals

1993-10-19

1995-03-21

Richter, Johann

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

Organic compounds

Oxygen containing

568592, 568594, 568605, C07C 4156

Patent

active

053997786

ABSTRACT:
Ketals of longer-chain or branched alcohols are prepared from dimethyl ketals or their ketones by reaction of the dimethyl ketals and the alcohols at high temperatures of 150.degree. to 180.degree. C. in the presence of acid catalysts. The enol ethers and mixed ketals which are separated by distillation are added to the next reaction batch and also react to form the target product. The starting material, dimethyl ketal, may also be formed during the reaction from the ketone and trimethyl orthoformate.

REFERENCES:
patent: 3072727 (1963-01-01), Howard et al.
patent: 3127450 (1964-03-01), Lorette et al.
Streitweiser et al, Introduction to Organic Chemistry, pp. 372-377, 1976.
Mackenzie et al, J. Organic Chemistry, (20), pp. 1695-1701, 1955.
Carswell et al., J. American Chemical Society, (50) pp. 235-241, 1928.

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