Patent ID: 8415503

Claim:
A method for preparation of 1,1-diamino-2,2-dinitroethylene comprising the following steps: (1) preparing 4,6-dihydroxy-5,5-dinitro-2-(dinitromethylene)-2,5-dihydropyrimidine through the nitration of 4,6-dihydroxy-2-methylpyrimidine; (2) dissolving 4,6-dihydroxy-5,5-dinitro-2-(dinitromethylene)-2,5-dihydropyrimidine prepared in the above step (1) into water in a reactor at an inner temperature of the reactor of 30-60° C., and maintaining the resultant solution at the same temperature for 1.5-2.0 hours; and (3) lowering the inner temperature of the reactor to 20-25° C., then filtering and washing the resultant product to obtain 1,1-diamino-2,2-dinitroethylene.