abstract |
PCT No. PCT/JP90/01092 Sec. 371 Date Apr. 29, 1991 Sec. 102(e) Date Apr. 29, 1991 PCT Filed Aug. 29, 1990 PCT Pub. No. WO91/03469 PCT Pub. Date Mar. 21, 1991.This invention relates to 3,6-diamino-2,5-pyrazinedicarbonitrile which is a red crystal and yellowish green fluorescent substance and the methods of preparation from compounds represented by formula (I), (* CHEMICAL STRUCTURE *) (I) (wherein R are aryl, alkyl, aralkyl or alkenyl or may be substituted), as a starting material, under acidic condition in the presence of oxygen. |