Imidazolophanes 3 bridged by short chains (n 5, 6) are readily accessible by [3 + 2] cycloadditions of imines with 2, formed from the bicyclic azirines 1 under electron-transfer conditions. Other heterocyclophanes can also be prepared by this method. DCN naphthalene dicarbonitrile.
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Müller et al. (1992) studied this question.
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