The synthesis of substituted heptalenes, e.g (3) and (4), can be accomplished via the bis(tricarbonyliron) derivative (2) formed from (1) and benzylideneacetone(tricarbonyliron). This entry into the chemistry of substituted heptalenes is facilitated by a new heptalene synthesis involving protection of the central double bond of isotetralin by epoxidation.
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Vogel et al. (1979) studied this question.
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