Acid-induced ring opening of adducts of furan and methoxydehydrobenzenes gives the naphthalenols derived from the more stable carbocation. The cycloadditions of methoxydehydrobenzenes containing a 3-methoxy group and 2-methoxyfuran are highly regiospecific. The adducts, being strained acetals, undergo ring opening to provide a convenient synthesis of naphthalenols.
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Giles et al. (1991) studied this question.
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