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ESR Study of Ethynyl and Vinyl Free Radicals
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12.There is a direct interaction for the α proton in vinyl and formyl because the σ orbital containing the unpaired electron has nonzero density at this proton; however, the magnitude of this contribution is expected to be very small in comparison to the indirect interaction.
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24.M. Karplus, J. Chem. Phys. 33, 1842 (1960) has employed a similar mechanism to account for proton‐proton spin coupling in a number of unsaturated molecules.
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