ENDOR observations were carried out for several triphenylmethyl derivatives with ortho- or para-methoxy substituents. The alteration of the spin-density distribution caused by steric hindrance, in particular, due to the low symmetrical substitution, was investigated. Using a revised MO parameter proposed by Kulkarni, McLachlan MO calculations were carried out and the twisting angles of the hindered phenyl groups are estimated.
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Ishizu et al. (1977) studied this question.
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