Abstract
IT is being increasingly recognized1 that the evidence for hyperconjugation from dipole moment data needs to be re-interpreted. Since the electronegativity of an sp or sp 2 carbon differs from that of an sp 3 carbon, the primary moments of the C(sp)—C(sp 3) and C(sp 2)—C(sp 3) bonds are not zero, and the dipole moments of molecules such as toluene, methylacetylene, etc., may arise solely from this effect.
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FERREIRA, R. Dipole Moment Data and Hyperconjugation. Nature 188, 848 (1960). https://doi.org/10.1038/188848a0
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DOI: https://doi.org/10.1038/188848a0
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