Abstract
Gas-phase pyrolyses of ethyl N-(5-cyanomethyl-1,3,4-thiadiazol-3-yl)carbamate (1), 1-benzoyl-3-(3-methylpyrazol-5-yl)thiourea (2), 1-benzoyl-3-(5-methylisoxazol-3-yl)thiourea (3), and 1-acetyl-3-(3-phenyl-pyrazol-5-yl)thiourea (4) have been studied. These reactions were homogeneous and unimolecular. The kinetics obeyed the first-order rate equation. Utilization of this pyrolytic reaction in heterocyclic synthesis is considered, and mechanistic information has been obtained from kinetic data and product analysis using an on-line pyrolysis GC-MS technique. The physical constants of four new substituted aminoazoles are also described. © 1997 John Wiley & Sons, Inc.
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