.alpha.-(o-Chlorophenyl)-aminomethylene-.beta.-formylaminopropionitrile, process for its preparation by reacting a metal salt of .alpha.-formyl-.beta.-formylaminopropionitrile with a salt of o-chloroaniline in an aqueous medium, and use of the product to prepare the compound of the formula ##STR1## by reaction with acetamidine. The pyrimidine thus obtained is an intermediate for the preparation of vitamin B.sub.1.
.alpha.-(邻
氯苯基)-
氨亚甲基-.beta.-甲酰基
氨基
丙腈的制备方法是将.alpha.-甲酰基-.beta.-甲酰基
氨基
丙腈的
金属盐与
邻氯苯胺的盐在
水介质中反应,所得产物通过与乙酰胺基的反应制备出式子##STR1##的化合物。所得的
嘧啶是
维生素B.sub.1的制备中间体。