THE MECHANISM OF THERMAL ELIMINATION OF UREA AND THIOUREA DERIVATIVES.2. RATE DATA FOR PYROLYSIS OF N-ACETYL-N'-PHENYLTHIOUREA AND N-BENZOYL-N'-ARYLTHIOUREAS

Authors
ALAWADI N ELNAGDI MH MATHEW T ELGAMRY I
Citation
N. Alawadi et al., THE MECHANISM OF THERMAL ELIMINATION OF UREA AND THIOUREA DERIVATIVES.2. RATE DATA FOR PYROLYSIS OF N-ACETYL-N'-PHENYLTHIOUREA AND N-BENZOYL-N'-ARYLTHIOUREAS, Heteroatom chemistry, 8(1), 1997, pp. 63-66
Citations number
5
Categorie Soggetti
Chemistry
Journal title
Heteroatom chemistry → ACNP
ISSN journal
10427163
Volume
8
Issue
1
Year of publication
1997
Pages
63 - 66
Database
ISI
SICI code
1042-7163(1997)8:1<63:TMOTEO>2.0.ZU;2-G
Abstract
The first-order rate constants of N-acetyl-N'-phenylthiourea (1), N-be nzoyl-N'-phenyl-(2a), N-benzoyl-N'(4-nitrophenyl)- (2b), N-benzoyl-N'- (3-chlorophenyl) (2c), N-benzoyl-N'-(4-chlorophenyl) (2d), and N-benzo yl-N'- (4-methylphenyl) thiourea (2e) were measured between 423 and 50 0 K. The reactions were homogeneous and unimolecular with log A (s(-1) ) = 12.0, 13.2, 13.8, 10.9, 11.8, and 12.7 and E(a) kJ mol(-1) = 130.3 , 141.4, 134.6, 114.9, 124.1, and 141.1, respectively. The rate data g ave good Hammett correlation with sigma degrees values, and rho is 1.9 9 at 450 K. (C) 1997 John Wiley & Sons, Inc.