The hyperconjugative result of bond stretching in alkenes has been studied with MM4. A low-temperature crystallographic study of 1,2-diarylindane[a]indane has been carried out, together with ab initio (MP2/6-31G*) calculations on model systems. The results are well reproduced with a force field designed to explicitly include hyperconjugation (MM4), and they show beyond doubt that hyperconjugative bond elongations exist both in theory and by experiment.
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Allinger et al. (1996) studied this question.
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