Process for the preparation of dichloro-(2,2)-paracyclophane

Details Process for the preparation of dichloro-(2,2)-paracyclophane Process for the preparation of dichloro-(2,2)-paracyclophane

C - Chemistry, Metallurgy

07

C

260/653.1

C07C 17/26 (2006.01) C07C 25/22 (2006.01) C07C 209/74 (2006.01)

Patent

CA 2032714

Process for the preparation of dichloro-(2,2)- paracyclophane from p-methylbenzylhalide through 2(3)-chloro-p-methylbenzyltrimethylammonium halide by Hofmann elimination of 2(3)-chloro-p-methylbenzyl trimethylammonium hydroxide in an aqueous solution of alkali metal hydroxide, wherein the 2(3)-chloro- p-methylbenzyltrimethylammonium halide is prepared by chlorination of p-methylbenzyltrimethylammonium halide and the Hofmann elimination is conducted in the presence of dioxane.

Méthode de préparation de dichloro-(2,2)-paracyclophane à partir d'un halogénure de p-méthylbenzyle, via un halogénure de 2(3)-chloro-p-méthylbenzyltriméthylammonium par élimination d'Hofman de l'hydroxyde de 2(3)-chloro-p-méthylbenzyltriméthylammonium dans une solution aqueuse d'hydroxyde de métal alcalin; l'halogénure de 2(3)-chloro-p-méthylbenzyltriméthylammonium est préparé par chloration de l'halogénure de p-méthylbenzyltriméthylammonium et élimination d'Hofmann en présence de dioxane.

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