Abstract
Twelve energetic additives
7-18
were synthesized and evaluated for use as blowing agents. All blowing agent candidates were characterized by NMR spectroscopy, elemental analysis, differential scanning calorimetry, thermogravimetric analysis, and impact sensitivity testing. The X-ray crystal structure of pyrazolium nitrate was also determined. Hypergolic compounds imidazolidine
38a
, hexahydropyrimidine
38b
, and pyrrolidine derivatives
42
were obtained in improved 80-90% yields by the reduction of the corresponding carbonyl compounds with lithium aluminum hydride in ether under reflux for 12 h. Ignition delays (τ
exp
, μs) were determined for compounds
38a,b
and
42
.