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US 7,253,288 B2Granted
Process for preparing substituted tetrazoles from aminotetrazole
AssigneePacific Scientific Energetic Materials Company
InventorsRobert N. Renz, Michael D. Williams, John W. Fronabarger
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Abstract
The present invention is directed to the field of substituted tetrazole synthesis and manufacture. More particularly, the present invention is directed to processes for preparing substituted tetrazoles and tetrazolate salts, such as sodium nitrotetrazolate and sodium cyanotetrazolate, using small scale and/or microreactor techniques. The use of the present techniques result in less hazardous and more efficient manufacturing processes.
Claims9
A process for preparing a substituted tetrazole, comprising:
- (a) providing aminotetrazole;
- (b) providing nitrous acid;
- (c) providing a substitution compound, wherein said substitution compound contains a nucleophilic species for replacing the amino group on said aminotetrazole, wherein said nucleophilic species is an anion selected from the group consisting of NO2−, CN−, azido, and halogen anions;
- and
- (d) reacting said aminotetrazole, said nitrous acid, and said substitution compound under conditions suitable to form a substituted tetrazole;
- wherein the reaction is carried out in a reaction chamber that has a channel cross-sectional diameter of less than one millimeter;
- and
- wherein the reaction is carried out in the absence of copper precipitates.
5 more elements
Dependencies are inferred from the claim text.