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Scope of the formal (4+1) cycloaddition between cycloheptatrienes 1 and cyclobutenes 4.[a]
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[a] Reaction at 120 °C, 0.2 m in 1,2-dichloroethane, 2 equiv of 4 a–g, catalyst A (5 mol %), 3 h. Yields are for isolated adducts. [b] Cyclobutene 4 a was isolated from the reaction mixture of 1 a and 3 g. [c] 2 Equiv of 7-(4-chlorophenyl)cyclohepta-1,3,5-triene were used.
