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Kinetic study for addition of the phenylthio radicals to vinylpyridines

โœ Scribed by Osamu Ito; Minoru Matsuda

Publisher
John Wiley and Sons
Year
1984
Tongue
English
Weight
417 KB
Volume
16
Category
Article
ISSN
0538-8066

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โœฆ Synopsis

The absolute rate constants for reversible addition of the substituted phenylthio radicals to vinylpyridines in solution at 23ยฐC have been determined by flash photolysis method. For each phenylthio radical, the reactivities of vinylpyridines is 3-5 times lower than that of styrene. The relative equilibrium constants estimated with flash photolysis indicate that the stabilities of the adduct carbon-centered radicals generated from vinylpyridines are similar to that from styrene. The Harnrnett plots suggest that the difference in the reactivities originates in the polar transition state; the nitrogen atom in 4-vinylpyridine withdraws the electrons of vinylic double bond.

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