Preparation of unsaturated ketones

Details Preparation of unsaturated ketones Preparation of unsaturated ketones

C - Chemistry, Metallurgy

07

C

260/577, 260/582

C07C 45/75 (2006.01)

Patent

CA 2026779

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 120-150°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.

Cétones non saturées produites à partir de cétones et de paraformaldéhyde dans des conditions de réaction douces, en présence d'un catalyseur renfermant un sel d'acide de type halogéné d'une amine secondaire et d'une petite quantité d'un acide carboxylique. On privilégie des températures de 120-150 degrés C et des pressions de 775-1135 kilopascals. Des cétones di-insaturées, comme les cétones divinyliques, peuvent également être produites; si la cétone de départ renferme déjà un groupe insaturé, on obtient un second groupe insaturé.

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