Nippon Soda Co., Ltd.

Seiji Tazaki

Nobuo Matsui

Tomio Yagihara

Atsushi Yanagisawa

Takakazu Kojima

Nobuhiro Umeda

Katsunori Mikuma

This invention relates to 3,6-diamino-2,5-pyrazinedicarbonitrile which is a red crystal and yellowish green fluorenscent substance and the methods of preparation from compounds represented by formula [I], ##STR1## (wherein R are aryl, alkyl, aralkyl or alkenyl or may be substituted), as a starting material, under acidic condition in the presence of oxygen.

3,6-diamino-2,5-pyrazinedicarbonitrile

Aminoacetonitrile derivatives, where the 2-position of aminoacetonitrile is optionally substituted by alkylthio groups, arylthio groups and heterocyclicthio groups. The process for making such compounds comprises reacting hydrogen cyanide with the desired corresponding R-S-H and recovering the crystallized salt thereof. The aminoacetonitrile derivatives are useful as starting materials to produce pharmaceutical and agricultural intermediates such as benzomide derivatives with fungicidal and herbicidal activities.

Aminoacetonitrile derivatives

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Kurashiki, Japan

Seiji Tazaki