Flash vacuum pyrolysis of (p-chloro ethyl)-pyrazole was studied. Pyrazole elimination and vinyl chloride formation were found. Competitive reactions with (p-chloro ethyl)-pyrazole were carried out using N-ethyl-3,5-dimethyl pyrazole as internal standard to obtain the kinetic parameters (Ea). A(bHf")
Kinetics of the gas-phase thermal elimination of N-alkyl-pyrazoles
β Scribed by Jorge Daniel Perez; Leonardo Miguel Phagouape
- Publisher
- John Wiley and Sons
- Year
- 1987
- Tongue
- English
- Weight
- 307 KB
- Volume
- 19
- Category
- Article
- ISSN
- 0538-8066
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β¦ Synopsis
The kinetic study of the gas-phase thermal elimination reactions of N-ethyl-3,5 dimethyl-pyrazole ( I ) , N-ethyl-pyrazole ( I I 1, N-sec-butyl-pyrazole ( I I I 1, and N-tert-butyl-pyrazole (IV) using a flow system is reported. After obtaining activation parameters for I we carried out competitive reactions with II, III and IV using I as internal standard to obtain their E,. The values of A(AH,") calculated for II, ZII and ZV agree with the little differences in E , experimentally found.
π SIMILAR VOLUMES
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Flash Vacuum Pyrolysis of (a-phenylethyl) and (P-phenylethy1)-pyrazole were studied. Pyrazole and Styrene were found as only products of both reactions. The kinetic parameters obtained reinforce the results previously found about the poor influence of the substitutents on the LY and p carbons of the
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## Abstract Rates of thermal gasβphase elimination of eleven 2βaryloxyacetic acid have been measured over a 45Β°C temperature range for each compound. Hammett correlation of the present kinetic data with the literature Ο^0^ values of the given substituents gave a reaction Ο constant of 0.69 at 600 K
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