The mechanism of thermal elimination of urea and thiourea derivatives. Part 1. Rate data for pyrolysis of N-acetylurea, N-acetylthiourea, N,N -diacetylthiourea, and N-acetylthiobenzamide

✍ Scribed by Nouria Al-Awadi; Mohamed Hilmy Elnagdi; Tommy Mathew; Ibrahim El-Gamry

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 322 KB
• Volume: 7
• Category: Article
• ISSN: 1042-7163
• DOI: 10.1002/(sici)1098-1071(199611)7:6<417::aid-hc3>3.0.co;2-5

✦ Synopsis

Rates of thermal decomposition of N-acetylurea (l), N-acetylthiourea (2), N,N'-diacetylthiourea (3), and N-acetylthiobenzamide (4) have been measured over a 45 K range for each compound. The molecules were found to undergo unimolecular first-order elimination reactions for which log A = 11. 9, 11.6, 11.8, and 13.4 s-', and E , = 181..2, 135.9, 128.3, respectivelv. The reactivities of these compounds have been compared with those of amide derivatives and with each otheu. Product analysis together with the kinetic data were used to outline feasible pathways for the elimination reactions of the compounds under study.