Analysis of cis-butene conformation changes based on methyl group interactions, suggesting topological bonds over chemical bonds.
In two previous posts, I have looked at why cis-butene adopts conformation (a) rather than (b). I suggested it boiled down to electronic interactions between the methyl groups and the central alkene resulting in the formation of a H…H "topological" bond, rather than attraction between the H…H region to form a weak chemical "bond". Here […]
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Henry S. Rzepa (2011) studied this question.
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