Kinetics and mechanism of pyrolysis of sulphonyl hydrazones and oximes. Part 2—Structural effects and molecular reactivity

Abstract

The kinetics and products of the pyrolytic reaction of six tosyl arenecarboxaldoximes were studied over the temperature range ca 334 – 401 K to yield the following Arrhenius log A/s−1 and Ea / kJ mol−1, respectively: 10.92 and 98.25 for tosyl benzaldoxime and 10.83 and 100.4 for m-nitro-, 10.66 and 97.53 for p-chloro-, 11.80 and 107.8 for m-chloro-, 11.60 and 101.5 for p-methyl- and 10.84 and 97.75 for p-methoxybenzaldehyde O-[(4-methylphenyl)sulphonyl]oxime. At 500 K, the oxime compounds were found to be 9.4 × 103 – 2.7 × 104-fold more reactive than their hydrazone analogues. Copyright © 1999 John Wiley & Sons, Ltd.