Electron spin resonance studies of hyperconjugation in aromatic ions
Electron spin resonance studies of hyperconjugation in aromatic ions
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芳香族离子超共轭的电子自旋共振研究
DOI：
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发表时间：
1962
期刊：
影响因子：
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通讯作者：
A. McLachlan
中科院分区：
文献类型：
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作者：
J. Bolton;A. Carrington;A. McLachlan
我们发现强有力的证据表明，芳香烃正离子中甲基与环系之间的主要相互作用是超共轭作用，而不是诱导效应。对甲基质子的超精细裂解进行了比较。9-甲基菲和9，10-二甲基菲的正负离子光谱。正离子的分裂大约是正离子的两倍，如果发生超共轭，这是可以预料到的，但不能用归纳模型来解释。环质子裂解也已被测量，并显示出微小的变化，这可以用任一种理论来令人满意地解释。
We have found strong evidence that the main interaction between methyl groups and the ring system in the positive ions of aromatic hydrocarbons involves hyperconjugation rather than an inductive effect. The methyl proton hyperfine splittings have been compared in the e.s.r. spectra of both positive and negative ions of 9-methylanthracene and 9,10-dimethylanthracene. The splittings are about twice as large in the positive ions, which is expected if hyperconjugation takes place, but cannot be explained by an inductive model. The ring proton splittings have also been measured, and show small variations which can be explained satisfactorily by either theory.