1,2-Butanediol → 2-(4'-Chloro-2'-difluoromethoxyphenyl)-2-methyl-4-ethyl-1,3-dioxolane

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Reaction Steps

12.8 parts of 1-(4-chloro-2-difluoromethoxyphenyl)ethan-1-one and 10.4 parts of 1,2-butanediol are heated under reflux for 12 hours in 100 ml of abs. toluene in the presence of 0.2 part of p-toluene-sulfonic acid as catalyst, while removing the water of reaction with a water separator. The reaction mixture is cooled to room temperature and then washed with 2×100 ml of water, dried over sodium sulfate and filtered. The solvent is removed by evaporation and the residual oil is purified by high-vacuum distillation; b.p. 78°-80° C./0.04 mbar.

Provenance & Evidence