申请人:Ciba-Geigy Corporation
公开号:US04245098A1
公开(公告)日:1981-01-13
A novel process for producing 2,3,5-trichloropyridine is described. The process comprises the addition reaction of trichloroacetaldehyde with acrylonitrile in the presence of a catalyst, and the subsequent cyclization of the intermediately formed 2,4,4-trichloro-4-formylbutyronitrile, with the splitting-off of water, to give 2,3,5-trichloropyridine. 2,4,4-Trichloro-4-formylbutyronitrile occurring as an intermediate product in the process according to the invention is a novel compound. It can be produced by the addition reaction of trichloroacetaldehyde with acrylonitrile in the presence of a catalyst. 2,3,5-Trichloropyridine can be used as intermediate for the production of herbicidal active substances.
描述了一种生产2,3,5-三氯吡啶的新工艺。该工艺包括在催化剂存在下,三氯乙醛与丙烯腈的加成反应,以及随后的中间体2,4,4-三氯-4-甲酰丁腈的环化,水的分解,形成2,3,5-三氯吡啶。根据该发明的工艺中出现的中间产物2,4,4-三氯-4-甲酰丁腈是一种新化合物。它可以通过在催化剂存在下,三氯乙醛与丙烯腈的加成反应来生产。2,3,5-三氯吡啶可用作制备除草剂活性物质的中间体。