Cyclohexanone → 1-(4-(1,3-Dioxolan-2-yl)phenyl)cyclohexanol

참여 물질

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반응 단계

A solution of 22.9 g of 2-(p-bromophenyl)-1,3-dioxolan in 100 ml of tetrahydrofuran is added dropwise, at 60° C, to a well stirred suspension of 2.65 g of magnesium chips, which have been washed with chloroform and activated with iodine, in 100 ml of absolute tetrahydrofuran. The dropwise addition is carried out in such a manner that after the onset of the reaction, the temperature does not rise above 60° C. At the conclusion, the reaction mixture is heated for one hour, then cooled to 30° C and, while stirring, 11 g of cyclohexanone are added dropwise. After being heated for 1 hour to 50° C, the reaction mixture is evaporated in vacuo in a rotary evaporator and the residue mixed with ice and a saturated ammonium chloride solution. Extraction with ether is effected, and the ethereal extracts are dried over sodium sulphate and evaporated. The residue is distilled under a high vacuum and yields the 2-[p-(1-hydroxy-cyclohexyl)-phenyl]-1,3-dioxolan having a boiling point of 160°-170° C (0.05 mm Hg), which becomes solid on standing and melts at 95°-97° C after recrystallization from ether + petroleum ether.

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