Abstract
Consideration of the non equivalence of hydrogen atoms in a methyl group attached to a planar moiety indicates that a component of electric dipole moment should exist in a direction perpendicular to the local C 3 axis of the CH3 group. Semiempirical molecular-orbital computations produced estimates of this moment and of the barriers to internal rotation which may make this moment observable.
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Ogilvie, J.F. Perpendicular component of dipole moment in methyl groups. Theoret. Chim. Acta 44, 215–218 (1977). https://doi.org/10.1007/BF00549103
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DOI: https://doi.org/10.1007/BF00549103