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The geometrical and electronic structures and the 1H‐chemical shifts of some conjugation deficient hydrocarbons and their benzenoid isomers 1–3 which consist of two concentric perimeters have been studied by means of semiempirical procedures. Conclusions on the importance of macrocyclic annulenoid conjugation are drawn from the bond lengths pattern and the proton shifts in these compounds.
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H. Vogler (1986) studied this question.
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