Process for producing thiosemicarbazides

Details Process for producing thiosemicarbazides Process for producing thiosemicarbazides

C - Chemistry, Metallurgy

07

C

C07C 337/06 (2006.01) C07D 285/12 (2006.01) C07D 285/135 (2006.01)

Patent

CA 2446918

A process is provided for producing a thiosemicarbazide which includes the steps of reacting an alkylamine with carbon disulphide in the presence of a base selected from N,N-diisopropylethylamine and N,N,-diisopropyl-methylamine to produce an intermediate and converting the intermediate into the thiosemicarbazide. The process has particular application to producing 4- methyl-3-thiosemicarbazide, an intermediate useful in producing the broad- spectrum herbicide tebuthiuron.

L'invention concerne un procédé de production d'un thiosemicarbazide, consistant à faire réagir une alkylamine avec du sulfure de carbone en présence d'une base, choisie entre la N,N-diisopropyléthylamine et la N,N,-diisopropylméthylamine, pour obtenir un produit intermédiaire, puis à convertir ce produit intermédiaire en thiosemicarbazide. Ce procédé peut être mis en oeuvre en particulier pour produire du 4-méthyl-3-thiosemicarbazide, un produit intermédiaire utile dans la production de l'herbicide à large spectre tebuthiuron.

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