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Gas-phase pyrolysis in heterocyclic synthesis. Gas-phase elimination reactions of some substituted aminoazoles

✍ Scribed by Nouria A. Al-Awadi; Mohamed H. Elnagdi

Publisher: John Wiley and Sons
Year: 1997
Tongue: English
Weight: 183 KB
Volume: 8
Category: Article
ISSN: 1042-7163
DOI: 10.1002/(sici)1098-1071(1997)8:4<293::aid-hc2>3.0.co;2-c

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✦ Synopsis

Gas-phase pyrolyses of ethyl N-(5-cyanomethyl-1,3,4thiadiazol-3-yl)carbamate ( ), 1-benzoyl-3-(3-methylpyrazol-5-yl)thiourea ( ), 1-benzoyl-3-(5-methylisoxazol-3-yl)thiourea ( ), and 1-acetyl-3-(3-phenylpyrazol-5-yl)thiourea ( ) 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.

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