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The first crystal structure analysis of a chromium insertion product in a cyclophane has been achieved on the salt (1), whose cation exists exclusively in the chair conformation. In contrast, according to its 1H-NMR spectrum, the corresponding chromium(0) compound is present in the boat conformation (2) and the chair conformation (3) in a ratio of 1:1 in solution at −70°C.
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Benn et al. (1980) studied this question.
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