Kinetics and mechanism of pyrolysis of sulphonyl hydrazones and oximes. Part 1. Contribution to reactivity from hydrazone HNN and oxime ON bond polarity

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

• Book ID: 104208519
• Publisher: Elsevier Science
• Year: 1998
• Tongue: French
• Weight: 304 KB
• Volume: 54
• Category: Article
• ISSN: 0040-4020
• DOI: 10.1016/s0040-4020(98)00179-3

✦ Synopsis

Rates were obtained for the pyrolysis of tosyl arenecarboxaldehyde hydrazones (1-5), and mesyl benzaldoxime (6). The substituted tosyi sulphonamides (TsHNN=CHAr: 1-5) and the mesylate (6) gave in a novel pyrolytic reaction the following Arrhenius log A/s -1 and E,/kJ tool -1 values, respectively: 12.70 and 157.7 (1, Ar = C6H5), 12.29 and 152.6 (2, I~-NO2C6H4), 11.85 and 148.2 (3, m-NO2C6H4), 12.17 and 152.0 (4, I~-CIC6H4), 11.01 and 140.8 (5, I~-CH3OC6H4), and 12.96 and 109.9 for (6). Tosyl benzaldoxime ( 7) was also studied. The reactions yielded cyanoarenes together with sulphonic acids from 6 and 7, and ~methylbenzenesulphonamide from compounds 1-5.