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

✍ Scribed by Nouria A. Al-Awadi; Mohamed H. Elnagdi; Kamini Kaul; Swaminathan Ilingovan; Osman M. E. El-Dusouqui

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 54 KB
• Volume: 12
• Category: Article
• ISSN: 0894-3230
• DOI: 10.1002/(sici)1099-1395(199908)12:8<654::aid-poc168>3.0.co;2-l

✦ Synopsis

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 À1 and E a / kJ mol À1 , 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-[(4methylphenyl)sulphonyl]oxime. At 500 K, the oxime compounds were found to be 9.4 Â 10 3 -2.7 Â 10 4 -fold more reactive than their hydrazone analogues.