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The mechanism of thermal elimination of urea and thiourea derivatives. Part 2. Rate data for pyrolysis of N-acetyl-N′-phenylthiourea and N-benzoyl-N′-arylthioureas

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

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
137 KB
Volume
8
Category
Article
ISSN
1042-7163

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✦ Synopsis

The first-order rate constants of N-acetyl-NЈ-phenylthiourea (1), N-benzoyl-NЈ-phenyl-(2a), N-benzoyl-NЈ-(4-nitrophenyl)-(2b), N-benzoyl-NЈ-(3-chlorophenyl) (2c), N-benzoyl-NЈ-(4-chlorophenyl) (2d), and N-benzoyl-NЈ-(4-methylphenyl)thiourea (2e)

were measured between 423 and 500 K. The reactions were homogeneous and unimolecular with log A (s ‫1מ‬ ) ‫ס‬ 12. 0, 13.2, 13.8, 10.9, 11.8, and 12.7 and E a kJ mol ‫1מ‬ ‫ס‬ 130.3, 141.4, 134.6, 114.9, 124.1, and 141.1, respectively. The rate data gave good Hammett correlation with r 0 values, and q is 1.99 at 450 K.

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