Studies of sulfonyl radicals. III. Solvent effects on the thermal decomposition of benzyl phenylazo sulfone.
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概要
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The first-order rate constants for thermal decomposition of benzyl phenylazo sulfone (BPA, <B>1</B>) have been determined spectrophotometrically in six solvents using the free radical scavenging technique with a stable Koelsch free radical. Activation parameters in the non-polar solvents such as benzene, toluene, anisole and chlorobenzene were almost the same, but in the two polar solvents, pyridine and nitrobenzene, activation entropies decreased significantly as compared with those in the non-polar solvents. This can be explained by the solvation of the polar solvent in the transition state leading to a phenyldiazenyl and α-toluenesulfonyl radical pair.
- 公益社団法人 日本化学会の論文
著者
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Matsuda Minoru
Chemical Research Institute of Non-aqueous Solutions, Tohoku University
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IINO MASASHI
Chemical Engineering Laboratory, Tokyo Metropolitan University
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Yanagisawa Tateo
Chemical Research Institute of Non-aqueous Solutions, Tohoku University
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Takahashi Yozo
Chemical Research Institute of Non-aqueous Solutions, Tohoku University
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