Trimerization of 4‐Amino‐3,5‐dinitropyrazole: Formation,Preparation, and Characterization of 4‐Diazo‐3,5‐bis(4‐amino‐3,5‐dinitropyrazol‐1‐yl) pyrazole (LLM‐226)

4‐Amino‐3,5‐dinitropyrazole (LLM‐116, 1 ) undergoes trimerization to 4‐diazo‐3,5‐bis(4‐amino‐3,5‐dinitropyrazol‐1‐yl) pyrazole (LLM‐226) upon heating. A mechanism is proposed and discussed. LLM‐226 is a new diazo‐based energetic material, thermally stable, and insensitive to impact, friction, and spark. The material may be prepared by heating 1 and 4‐diazo‐3,5‐dinitropyrazole ( 2 ) in a mixture of toluene and butyl acetate at 110°C or heating 1 alone in dichlorobenzene at 160°C. The characterization of LLM‐226 including X‐ray crystallographic analysis and small‐scale safety properties will be discussed.