Density-functional investigation of some decomposition routes of methyl nitrate
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Two density-functional methods, B3/LYP/6-31+G(d) and B3/PW91/6-31G(d,p) have been used to investigate some possible decomposition pathways for methyl nitrate. Two likely ones were found to be (a) loss of NO2, followed by eventual rearrangement to H2C-OH, and (b) formation of H2C=O and HONO. The initial energy requirement for each process is about 40 kcal/mol, and the second is exothermic, H = -16 kcal/mol of H3C-ONO2. The B3/LYP procedure is found to underestimate the H3CO-NO2 and H3C-ONO2 dissociation energies by about 6 kcal/mol. 1997 John Wiley & Sons, Inc.