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Chemical synthesis study demonstrates efficient cobalt-promoted [6 + 2] cycloaddition of cycloheptatrienes with allenes, highlighting an effective catalytic pathway for selective ring assembly.
[6 + 2] Cycloadditions between cycloheptatrienes with allenes have been investigated. Cobalt salts were found to promote this transformation efficiently. Moreover, this reaction was found to be highly selective since only one regioisomer was obtained with an excellent E/Z-selectivity.
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Clavier et al. (2010) studied this question.
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