反应详情

The reaction was conducted in the same manner as in Example 1 for 6 hours by using 8.9 g (30 mmol) of neopentyl 3,4,5-trichlorobenzoate instead of neopentyl 2,3,4,5-tetrachlorobenzoate in Example 1, 2.6 g (45 mmol) of spray-dried potassium fluoride, 1.3 g (3 mmol) of tetraphenyl phosphonium bromide and 9 g of anhydrous sulfolane. The post-treatment was conducted in the same manner, followed by distillation under reduced pressure to obtain 5.3 g of neopentyl 3,5-dichloro-4-fluorobenzoate. Further, the distillation residue was subjected to silica gel column chromatography and eluted with benzene to obtain 2.0 g of neopentyl 3,5-dichloro-4-fluorobenzoate as slightly yellow plates. The combined yield was 87%. The physical properties are shown below.

1. distillationfollowed by distillation under reduced pressure