Is hydrazoic acid (HN3) an intermediate in the destruction of hydrazine by excess nitrous acid?

1995 ◽  
pp. 3103 ◽  
Author(s):  
Anne M. M. Doherty ◽  
Kevin R. Howes ◽  
Geoffrey Stedman ◽  
Memdoh Q. Naji
Keyword(s):  
Nitrous Acid ◽  
Hydrazoic Acid

THE REACTION OF NITROUS ACID WITH 4-SUBSTITUTED-THIOSEMICARBAZIDES

1957 ◽  
Vol 35 (8) ◽  
pp. 832-842 ◽  
Author(s):  
Eugene Lieber ◽  
C. N. Pillai ◽  
Ralph D. Hites
Keyword(s):  
Nitrous Acid ◽  
Relative Proportion ◽  
Chemical Degradation ◽  
Hydrazoic Acid ◽  
Melting Points ◽  
Pure Nitrogen ◽  
Competitive Reactions ◽  
Azide Ion ◽  
Lower Melting Point ◽  
Aryl Isothiocyanates

The reaction of nitrous acid with 4-alkyl- or 4-aryl-thiosemicarbazides, as well as the reaction of alkyl- or aryl-isothiocyanates with hydrazoic acid, leads to the identical 5-(substituted)amino-1,2,3,4-thiatriazole. This has been established by infrared absorption and chemical degradation studies. The reaction of the 5-(substituted)amino-1,2,3,4-thiatriazoles with aqueous bases leads to two competitive reactions: (1) degradation to an isothiocyanate and azide ion, and (2) isomerization to a 1-substituted-tetrazole-5-thiol, the extent of path (1) or (2) depending on the nature of the substituent. Path (1) predominates when the substituent is alkyl, whereas when the substituent is aryl both paths (1) and (2) occur, the relative proportion depending on the electrical nature of the aromatic group, path (2) increasing as the electronegativity increases. The 1-aryl-tetrazole-5-thiols were found to be thermally unstable at their melting points, degrading more or less violently to one mole proportion of pure nitrogen with the formation of sulphur and organic products of lower melting point as yet unidentified. Theories to account for these observations are presented and discussed.

Evidence for heterogeneous formation of nitrous acid on cloud droplets

2000 ◽  
Vol 31 ◽  
pp. 352-353 ◽  
Author(s):  
K. Acker ◽  
W. Wieprecht ◽  
R. Auel ◽  
D. Kalass ◽  
D. Möller
Keyword(s):  
Nitrous Acid ◽  
Cloud Droplets ◽  
Heterogeneous Formation
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