Preparation of vinyl ketones from acetone and...

C - Chemistry – Metallurgy – 07 – C

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260/579.4, 260/5

C07C 45/75 (2006.01) C07C 49/20 (2006.01)

Patent

CA 2026438

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 nonsoluble solid oxide of an element selected from Groups IB, IIIA, IVA, IVB, VA, VB, VIB and VIII of the periodic table. Temperatures of 120-150 and pressure of 700-1200 kpa are preferred; by-products may include di-unsaturated ketones such as divinyl ketone, Unsaturated ketones such as methyl vinyl ketone are useful in imparting ultraviolet sensitivity to plastics which enhances degradability.

Les cétones insaturées sont produites à partir de cétones et de paraformaldéhyde dans des conditions de réaction douces utilisant un catalyseur comprenant un sel acide d'halogène d'une amine secondaire et un oxyde solide non soluble d'un élément choisi parmi les groupes IB, IIIA, IVA, IVB, VA, VB, VIB et VIII du tableau périodique. Une température variant de 120 à 150 et une pression de 700 à 1 200 kpa sont jugées préférables, les sous-produits peuvent comprendre des cétones di-insaturées comme la divinylcétone; les cétones insaturées, comme la méthylvinylcétone, sont utiles pour conférer aux plastiques une sensibilité aux ultraviolets qui en accroît la dégradabilité.

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