Arylidenepyridylhydrazines: Synthesis, and kinetics and mechanism of their gas-phase pyrolysis

被引：6
作者：
Al-Qallaf, Mahasen A. [1 ]
Dib, Hicham H. [1 ]
Al-Awadi, Nouria A. [1 ]
El-Dusouqui, Osman M. E. [1 ]
机构：
[1] Kuwait Univ, Chem Dept, POB 5969, Safat 13060, Kuwait
来源：
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS | 2017年 / 124卷
关键词：
Pyrolysis; Kinetics; Mechanism; Oxidative cyclization; Valence-bond isomerization; FLASH VACUUM PYROLYSIS; ELIMINATION-REACTIONS; SULFONYL HYDRAZONES; THERMAL REACTIVITY; PART; DERIVATIVES; THERMOLYSIS; CYANOHYDRAZONES; 1,2,4-TRIAZOLES; CYANOACETAMIDES;
D O I：
10.1016/j.jaap.2017.02.021
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
Five arylidenepyridin-2-ylhydrazines (1a-e) were synthesized using conventional and microwave enhanced techniques, and then subjected to flash vacuum and static (sealed-tube) pyrolysis. The pyrolysates from both reactions were analyzed, and their constituents characterized and identified. Further, the kinetics of pyrolysis of the substrates were investigated over the temperature range: 497-632 K. Rates of reaction and entropies of activation at 500 K were evaluated and used to correlate substrate molecular reactivities, and to provide evidence in support of the mechanism suggested for the pyrolysis reactions. An interesting gas-phase oxidative cyclization reaction observed for the present hydrazines is described and explained. (C) 2017 Elsevier B.V. All rights reserved.
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页码：446 / 453
页数：8
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