反应详情

温度

100 °C

118.4 g (0.29 mol) of this ester were dissolved in 50 ml of dimethylformamide at 70° C., 0.3 g of 2-tert-butyl-4,6-dimethylphenol was added as stabilizer, 111.7 g (0.9 mol) of dry potassium methacrylate salt were added, and the mixture was diluted with 70 ml of toluene. The reaction mixture was stirred at 100° C. for 6 h, then cooled and diluted with 800 ml of methyl tert-butyl ether. The precipitate was filtered off with suction, and the washing solution and the filtrate were combined and washed three times with water. They were then concentrated, and the crude product obtained was recrystallized from isopropanol. 4-(4-Methacryloyloxybutoxy)phenyl 4-allyloxybenzoate of m.p. 62-63° C. was obtained in a yield of 83%. Between 41 and 45° C. the ester has a nematic phase which occurs only on supercooling.

1. additionwere added
2. temperaturecooled
3. filtrationThe precipitate was filtered off with suction
4. washwashed three times with water
5. concentrationThey were then concentrated
6. customthe crude product obtained
7. customwas recrystallized from isopropanol