Fluorine deshielding in the proximity of a methyl group. An experimental and theoretical study

…, DJ Keavy, ER Olson, ID Rae, A Staffa…

文献索引：Gribble, Gordon W.; Keavy, Daniel J.; Olson, Erik R.; Rae, Ian D.; Staffa, Alfred; et al. Magnetic Resonance in Chemistry, 1991 , vol. 29, # 5 p. 422 - 432

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被引用次数: 26

摘要

Abstract 19 F chemical shifts are reported for a series of alkyl-substituted fluoronaphthalenes and related compounds that exhibit steric crowding around the fluorine atom due to the proximity of methyl groups. Comparisons of these chemical shifts with others measured in similar compounds but without the corresponding methyl groups show that this crowding effect produces a large low-field shift of the 19 F signal. Similar effects, but with an even ...