Preparation of higher unsaturated ketones

Details Preparation of higher unsaturated ketones Preparation of higher unsaturated ketones

1980-06-26

1982-01-12

Breitenstein, G. T.

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

Organic compounds

Oxygen containing

568346, 568398, 568356, C07C 4548

Patent

active

043107052

ABSTRACT:
An improved process for the preparation of higher unsaturated ketones, such as geranylacetone and farnesylacetone, by reacting a .beta.,.gamma.-unsaturated alcohol and an alkyl acetoacetate at an elevated temperature in the presence of an organic aluminum compound, with elimination, and removal, of the alcohol derived from the alkyl acetoacetate in a reactor system carrying a fractionating column. The improvement in the purity, yield, and especially space-time yield of the product is achieved by starting from an alcohol having a higher boiling point than that of the alkyl acetoacetate used, carrying out the reaction in the presence of a small amount of an inert liquid which has a boiling point between that of the alkyl acetoacetate and the alcohol to be eliminated therefrom, and ensuring that the temperature at the bottom of the fractionating column is only slightly higher than the boiling point of the added liquid, under the prevailing pressure.

REFERENCES:
patent: 2795617 (1957-06-01), Kimel et al.
patent: 2839579 (1958-06-01), Kimel et al.
patent: 3101375 (1963-08-01), Crocker
patent: 4173588 (1979-11-01), Pasedach et al.
Carroll, J. Chem. Soc., 1941, pp. 507-511.

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