Under the influence of basic alcohol, 7‐phenyl‐1,3,5‐cycloheptatriene ( 7c ) forms its 1‐, 2‐ and 3‐isomers ( viz. 1c, 2c and 3c ) in parallel reactions, contrary to suggestions made in the literature. The activation parameters for these reactions are given. The difference in behaviour (in isomerization and exchange reactions under basic conditions) between 7‐(methoxycarbonyl)‐1,3,5‐cycloheptatriene ( 7b ) and 7‐phenyl‐1,3,5‐cyclopentatriene ( 7c ) is explained by the weaker electron‐attracting properties of the phenyl ring as compared to the methoxycarbonyl substituent.
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Zwaard et al. (1984) studied this question.
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