Carbon-13 nuclear magnetic resonance spectra of strained molecules. Diamagnetic and paramagnetic shifts of sterically compressed carbon resonances in [2,2]metacyclophanes
- 1 January 1974
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Chemical Communications
- No. 3,p. 97-98
- https://doi.org/10.1039/c39740000097
Abstract
Carbon-13 nuclear magnetic resonance spectra of [2,2]metacyclophanes show two types of steric compression shifts (van der Waals shifts) operating in an opposite direction: a large diamagnetic shift of bridging methylene carbon resonances due to an ortho-alkyl group and an anomalous paramagnetic shift of the inner aryl carbon resonances caused by direct carbon–carbon compression.Keywords
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