5-amino-1,2,3-thiadiazoles of the formula ##STR1## are made by reacting halogenoacetaldehydes of the formula X--CH.sub.2 --CH.dbd.O II with hydrazine derivatives of the formula H.sub.2 N--NH--COR III preferably in an aqueous medium or in a mixture of an aqueous medium with organic solvents so as to form acylhydrazones of the formula X--CH.sub.2 --CH.dbd.N--CH--CO--R IV whereupon the latter are reacted with thionylchloride of the formula SOCl.sub.2 V whereby 5-halogeno-1,2,3-thiadiazoles are formed which are then reacted with ammonia preferably in the presence of a catalyst such as a mineral acid or Lewis acid whereby the desired product is obtained. The products are useful in making plant protection agents and herbicides such as the 1,2,3-thiadiazolyl-urea derivatives.
公式:##STR1##
本发明提供了一种制备式为##STR1##的
5-氨基-1,2,3-噻二唑的方法,该方法通过将式X-CH.sub.2-CH.dbd.O II的卤代
乙醛与式H.sub.2N-NH-COR III的腙衍
生物在
水介质或
水介质与有机溶剂混合物中反应,以形成式X-CH.sub.2-CH.dbd.N-CH-CO-R IV的酰
肼,然后将其与式SOCl.sub.2 V的
氯化硫酰反应,形成5-卤代-1,2,3-
噻二唑,然后在催化剂的存在下,例如矿酸或
路易斯酸的存在下,将其与
氨反应,从而得到所需的产物。所得产物可用于制备植物保护剂和
除草剂,例如1,2,3-
噻二唑基
脲衍
生物。