Rh2(OAc)4-catalysed cycloaddition of ethyl diazoacetate (EDA) to 1,2-methylenedioxybenzene 1 gives the corresponding cycloheptatrienes 6 and 7, whereas the reaction of 1,2-dimethoxybenzene 3 affords a new type of stable norcaradiene 9.
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Matsumoto et al. (1995) studied this question.
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