Agency for Defense Development

Eun Mee Goh

Jin Seuk Kim

Jin Rai Cho

Seung Hee Kim

Hyoun-Soo Kim

Bang Sam Park

Hyung Sik Kim

Soo Gyeong Cho

Jae Kyung Kim

Jin Rae Cho

Disclosed is a method for preparation of 1,1-diamino-2,2-dinitroethylene (DADNE) through the hydrolysis of 4,6-dihydroxy-5,5-dinitro-2-(dinitromethylene)-2,5-dihydropyrimidine (DHDNDP) obtained by the nitration of 4,6-dihydroxy-2-methylpyrimidine (DHMP), which can avoid eruption or sudden frothing of a reaction solution on a lab scale and even a large scale preparation as well as reduce the reaction time.

Method for preparation of 1,1-diamino-2,2-dinitroethylene

Disclosed is a method for the nitration of 4,6-dihydroxy-2-methylpyrimidine for the synthesis of 4,6-dihydroxy-5,5-dinitro-2-(dinitromethylene)-2,5-dihydropyrimidine which is used as a precursor of 1,1-diamino-2,2-dinitroethylene, one type of explosives. The present invention provides an improved method for the nitration of 4,6-dihydroxy-2-methylpyrimidine, wherein organic solvent is applied in the nitration process of 4,6-dihydroxy-2-methylpyrimidine thereby solving the safety problem while improving the yield of nitration.

Method for the nitration of 4,6-dihydroxy-2-methylpyrimidine

The present invention provides a method for preparing 2,4-dinitroimidazole, wherein separation of 1,4-donitroimidazole in powder form is avoided so that it is possible to eliminate allergy problems in workers and simplify the process, thereby improving process economy.

Method for preparation of 2,4-dinitroimidazole which is an intermediate for insensitive meltcastable molecular explosive

Disclosed is a preparation method of 2,2&prime;-bi-1H-imidazole using glyoxal and an ammonium salt as starting materials through a safe, simple and easily controlled synthetic process with a high yield.

Preparation method of 2,2'-bi-1H-imidazole using glyoxal and an ammonium salt

A preparation method of 3-nitro-1,2,4-triazol-5-one using 1,2,4-triazol-5-one (TO) and mixed acid through a stable nitration process which can minimize a large exotherm and associated frothing problem during crystallization by inducing a crystal nucleus to be generated at a low temperature of 35&deg; C.-45&deg; C.

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Daejeon-si, South Korea

Eun Mee Goh