Process for the preparation of 2-ethyl-1,3-hexane diol

Details Process for the preparation of 2-ethyl-1,3-hexane diol Process for the preparation of 2-ethyl-1,3-hexane diol

C - Chemistry, Metallurgy

07

C

C07C 31/20 (2006.01) C07C 29/141 (2006.01) C07C 29/38 (2006.01) C07C 45/72 (2006.01)

Patent

CA 2171205

The invention relates to a process for the preparation 2-ethyl-1,3-hexane diol from n-butyraldehyde by aldol condensation in the presence of an alkali metal hydroxide or alkali earth metal hydroxide catalyst. To promote the reaction and to improve its controllability, a neutral phase-transfer catalyst is additionally used in the process according to the invention. 2-Ethyl-1,3-hexane diol is used in insecticides and, for example, in the polyesters.

L'invention se rapporte à un procédé de préparation du 2-éthyl-1,3-hexane diol à partir du n-butyraldéhyde par condensation d'aldol en présence d'un catalyseur d'hydroxyde métallique alcalin ou alcalino-terreux. Pour activer la réaction et améliorer sa contrôlabilité, on utilise en outre dans le procédé selon l'invention un catalyseur neutre de transfert de phase. On utilise le 2-éthyl-1,3-hexane diol dans des insecticides et, par exemple, dans la préparation de polyesters.

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