Hydroxylamine ammonium salts formation

When an excess of nitric acid of 10-50 per cent, strength is treated in the cold with stannous salt soln., hydroxylamine salts are the primary end-product of the reaction, but when the conditions of temp, and cone, are such that the nitric acid and the hydroxylamine salts react, then nitrous oxide is the. chief product together with small amounts of nitHe oxide, nitrogen and traces of nitrogen peroxide. No ammonium salts are formed. When stannous salts are used in excess over the nitric acid, the reaction takes place with hydroxylamine and ammonium salts as the products either in hot or cold soln., but the reaction is very slow in the latter case. When an excess of nitric acid is treated with titanous salt soln., the reaction takes place very rapidly with the formation of nitric oxide as the chief... 

Acyl nitroso compounds (3, Scheme 7.2) contain a nitroso group (-N=0) directly attached to a carbonyl carbon. Oxidation of an N-acyl hydroxylamine derivative provides the most direct method for the preparation of acyl C-nitroso compounds [10]. Treatment of hydroxamic acids, N-hydroxy carbamates or N-hydroxyureas with sodium periodate or tetra-alkyl ammonium periodate salts results in the formation of the corresponding acyl nitroso species (Scheme 7.2) [11-14]. Other oxidants including the Dess-Martin periodinane and both ruthenium (II) and iridium (I) based species efficiently convert N-acyl hydroxylamines to the corresponding acyl nitroso compounds [15-18]. The Swern oxidation also provides a useful alternative procedure for the oxidative preparation of acyl nitroso species [19]. Horseradish peroxidase (HRP) catalyzed oxidation of N-hydroxyurea with hydrogen peroxide forms an acyl nitroso species, which can be trapped with 1, 3-cyclohexanone, giving evidence of the formation of these species with enzymatic oxidants [20]. 

Nitrogen Compounds. Mixtures of ammonia and chlorine are explosive hydrazine and hydroxylamine ignite in chlorine.21"24 Formation of the dangerously explosive nitrogen trichloride is possible during chlorination of alkylthiuronium salts.25 Aziridine readily forms the explosive N-chloro derivative.26 Chlorination of sulfamic acid or acidic ammonium chloride solutions can give the powerfully explosive oil, nitrogen trichloride.27... 

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