Abstract 7‐Phenylcycloheptatriene‐1,3,5 rearranges on heating to a mixture of the 3‐, 1‐ and 2‐isomers. These are formed in the order indicated by successive trans‐annular 1‐5 shifts of hydrogen. The isomerization of the 7‐ to the 3‐isomer, by which the trienic and aromatic systems enter into conjugation, is appreciably faster than the 1‐5 shift in cycloheptatriene itself. The interconversion of the 3‐ and 1‐isomers, however, proceeds at a rate comparable with that of the unsubstituted compound. The nature of the solvent has no influence on the rate of the 1‐5 shift.
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Borg et al. (1963) studied this question.