反应详情

55.2 g (0.2 mol) of trans-4-hydroxycyclohexyl allyloxybenzoate prepared as described in Example 1 were dissolved in 300 ml of dry toluene, and 43 g (0.205 mol) of 6-bromohexanoyl chloride (prepared from the free acid by conventional reaction with thionyl chloride; b.p. 60-62° C. at 0.04 mbar) were added dropwise at 105° C. over the course of 60 minutes with stirring. After the mixture had been stirred at 105° C. for a further 90 minutes, the solvent was stripped off under reduced pressure, and the residue was crystallized out using petroleum benzine/methyl tert-butyl ether (20:1), giving 83 g (92%) of trans-[4-(6-bromo-hexanoyl)cyclohexyl] 4-allyloxybenzoate, melting point 56° C. 79 g (0.174 mol) of this ester, 25 g (0.21 mol) of potassium methacrylate and 0.2 g of 2,6-di-tert-butyl-4-methylphenol (stabilizer) were dissolved in 400 ml of dimethylformamide, and the mixture was heated at 70-75° C. for 3 hours with stirring. The solvent was then distilled off under reduced pressure, the residue was taken up in 400 ml of methyl tert-butyl ether, and the solution was washed with water, 0.05 N NaOH, and again with water, dried and evaporated. The residue was recrystallized from methanol, yielding 70 g (87.5%) of the title compound, which melts at 50° C. and clears at 55° C.

1. additionb.p. 60-62° C. at 0.04 mbar) were added dropwise at 105° C. over the course of 60 minutes
2. stirringAfter the mixture had been stirred at 105° C. for a further 90 minutes
3. customthe residue was crystallized out