Dinitrogen pentoxide reaction with water

The catalysed reaction was considered to arise from the heterolysis of dinitrogen pentoxide induced by aggregates of molecules of nitric acid, to yield nitronium ions and nitrate ions. The reaction is autocatalytic because water produced in the nitration reacts with the pentoxide to form nitric acid. This explanation of the mechanism is supported by the fact that carbon tetrachloride is not a polar solvent, and in it molecules of nitric acid may form clusters rather than be solvated by the solvent ( 2.2). The observation that increasing the temperature, which will tend to break up the clusters, diminishes the importance of the catalysed reaction relative to that of the uncatalysed one is also consistent with this explanation. The effect of temperature is reminiscent of the corresponding effect on nitration in solutions of nitric acid in carbon tetrachloride ( 3.2) in which, for the same reason, an increase in the temperature decreases the rate. 

Morris, E. D., and H. Niki (1973). Reaction of dinitrogen pentoxide with water. J. Phys. Chem. TJ, 1929-1932. 

SULFURIC OXYCHLORIDE (7791-25-5) SOjClj Forms corrosive mixture with air (Fire Rating 0). Reacts exothermically with water or steam, producing heat and yielding sulfuric acid and HCl vapors. Reacts violently with bases, amines, amides, inorganic hydroxides alkahs, alkali metals, dimethyl sulfoxide, dinitrogen pentoxide, lead dioxide (explosive reaction) N-methylformamide, red phosphorus. Reacts,... 

Dinitrogen pentoxide (generated by mixing streams of dinitrogen tetroxide and ozonized oxygen) allowed to react countercurrently with 1-octanol, which is added dropwise at the top of a glass-spiraled reaction column, then quenched immediately with water -> octyl nitrate (Conversion 93%) added to hexamethyl-phosphoramide followed by Na-nitrite and ethyl malonate as nitrous acid scavenger, then stirred 1 hr. at 45° 1-nitrooctane (Y 95% conversion 41%). F. e. s. G. B. Bachman and N. W. Connon, J. Org. Chem. 34, 4121 (1969). 

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