反应详情

温度

80 °C

First, 7.4 g (90.2 mmol) of sodium acetate and 8.0 g (28.2 mmol) of 1,1-dibromo-3,3,3-trifluoroacetone were mixed with 70 ml of water, and the mixture was stirred at 80° C. for 30 minutes and then cooled, to which 7.0 g of ethyl 2-chloro-5-hydrazinocinnamate was added at 10° C. or lower, and the mixture was stirred for 3 hours. The precipitated crystals were collected by filtration and dried, which afforded 9.6 g (27.5 mmol) of ethyl 2-chloro-5-(3,3,3-trifluoro-2-oxopropylidenehydrazino)cinnamate.

1. additionwas added at 10° C.
2. stirringlower, and the mixture was stirred for 3 hours
3. filtrationThe precipitated crystals were collected by filtration
4. customdried