Preparation of unsaturated ketones

Details Preparation of unsaturated ketones Preparation of unsaturated ketones

1989-06-19

1990-07-31

Reamer, James H.

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

Organic compounds

Oxygen containing

568345, 568390, C07C 4575

Patent

active

049451847

ABSTRACT:
Unsaturated ketones are produced from ketones and paraformaldehyde under mild reaction conditions utilizing a catalyst comprising a halogen acid salt of a secondary amine and a small amount of a carboxylic acid.
Temperatures of 120.degree.-150.degree. C. and pressures of 775-1135 kilopascals are preferred. Di-unsaturated ketones such as divinyl ketone may also be produced; if the starting ketone already has an unsaturated group, a second unsaturated group will be produced.

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patent: 4355184 (1982-10-01), Kaku et al.
Hays et al, "Condensation of Formaldehyde with Compounds Containing Activated Hydrogens", J. Am. Chem. Soc., vol. 73, pp. 5369-5373 (Nov. 1951).

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