反应详情

Oxalyl chloride (94.0 g, 0.739 mol) is added dropwise to a mixture of 2,4-difluoro-5-nitrobenzoic acid (100.0 g, 0.492 mol), methylene chloride and N,N-dimethylformamide (0.600 ml). The resultant mixture is stirred 3.25 hours at relux, cooled to room temperature, and concentrated in vacuo to afford the title compound as a brown oil (111 g, 95.2).

1. concentrationconcentrated in vacuo