反应详情

For example, 2,2-difluoro-4-pentenoic acid 8c is contacted with about 1.0 to 1.5 molar equivalents of an appropriate chlorinating agent. The reaction is carried out in a suitable solvent, such as dichloromethane, toluene or dimethylformamide. The reaction is carried out at a temperature of from about 20° C. to about 35° C. and generally requires about 4 to 24 hours. The product, 2,2-difluoro-4-pentenoyl chloride 8a, can be isolated by fractional distillation and purified by techniques well known in the art, such as chromatography.

1. customis carried out at a temperature of from about 20° C. to about 35° C. and generally requires about 4 to 24 hours