Polar Substituent Constants for Substituted Phenyl Groups. The Extended Taft Equation.
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概要
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Values of the σ<SUP>*</SUP> constants have been defined for some <I>m</I>- and <I>p</I>-substituted phenyl groups from the <SUP>29</SUP>Si–H coupling constants for a series of <I>m</I>- and <I>p</I>-substituted phenylsilanes, phenylmethylsilanes, and phenyldimethylsilanes. The σ<SUP>*</SUP> constants for the groups, XC<SUB>6</SUB>H<SUB>4</SUB>, were found to be directly related to the Hammett σ constants for the ring substituents, X. From this correlation the σ<SUP>*</SUP> constants for a number of other substituted phenyl groups have also been calculated. Examples have been presented in which a simple relationship holds between the Taft polar substituent constants including the newly derived σ<SUP>*</SUP> constants and molecular properties for a series of compounds covering both aliphatic and aromatic substances. Correlations of reactivities with the extended σ<SUP>*</SUP> values have been illustrated and the implications of the results are discussed.
- 公益社団法人 日本化学会の論文
著者
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Matsumoto Hideyuki
Department Of Applied Chemistry Faculty Of Engineering Gunma University
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Nakano Taichi
Department of Chemistry, Gunma University
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Nagai Yoichiro
Department of Applied Chemistry, Faculty of Engineering Gunma University
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Watanabe Hamao
Department of Applied Chemistry, Faculty of Engineering Gunma University
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