Nitrous oxide may also be obtained by the controlled reduction of nitrates or nitrites, decomposition of hyponitrites, or thermal decomposition of hydroxylamine.  [c.295]

Hyponitrous acid and hyponitrites  [c.459]

Hyponitrites can be prepared in variable (low) yields by several routes of which the commonest are reduction of aqueous nitrite solutions using sodium (or magnesium) amalgam, and condensation of organic nitrites with hydroxylamine in NaOEt/EtOH  [c.460]

As implied by the preparative methods employed, hyponitrites are usually stable towards  [c.460]

At room temperature, Htde reaction occurs between carbon dioxide and sodium, but burning sodium reacts vigorously. Under controUed conditions, sodium formate or oxalate may be obtained (8,16). On impact, sodium is reported to react explosively with soHd carbon dioxide. In addition to the carbide-forrning reaction, carbon monoxide reacts with sodium at 250—340°C to yield sodium carbonyl, (NaCO) (39,40). Above 1100°C, the temperature of the DeviHe process, carbon monoxide and sodium do not react. Sodium reacts with nitrous oxide to form sodium oxide and bums in nitric oxide to form a mixture of nitrite and hyponitrite. At low temperature, Hquid nitrogen pentoxide reacts with sodium to produce nitrogen dioxide and sodium nitrate.  [c.163]

A number of promising new routes to chemically synthesize ultrapure, ultrahomogeneous particles of controlled particle size and particle size distribution are currentiy under development. A modified sol—gel method has been developed to produce thermoplastic gels that are compatible with fiber spinning technology (see SoL-GEL TECHNOLOGY), as has a process which avoids the formation of barium carbonate, a troublesome impurity at the grain boundaries which seriously detracts from the critical current. In this latter process, hyponitrites and hydrated oxides derived from the hydrolysis of organometaUic solutions are subjected to a series of thermal treatments involving decomposition, oxidation, and finally annealing. Materials which can be decomposed and converted to the orthorhombic superconducting form are produced (45,46).  [c.483]

Vibrational spectroscopy indicates that the hyponitrite ion has the trans- (C2/1) configuration (1) in the above salts.  [c.460]

There is also considerable current environmental interest in hyponitrite oxidation because it is implicated in the oxidation of ammonia to nitrite, an important step in the nitrogen cycle (p. 410). Specifically, it seems likely that the oxidation proceeds from ammonia through hydroxylamine and hyponitrous acid to nitrite (or N2O).  [c.460]

In contrast to the stepwise oxidation of sodium hyponitrite in liquid N2O4, the oxidation goes rapidly to the nitrate ion in an inert solvent of high dielectric constant such as nitromethane  [c.460]

See pages that mention the term Hyponitrites : [c.279]    [c.219]    [c.446]    [c.460]    [c.460]    [c.461]    [c.470]   
Chemistry of the elements (1998) -- [ c.459 , c.460 ]