The adduct 2 has long been postulated as an intermediate in the formation of purpurogallin 1 from pyrogallol. The adduct 5, formed from the o-benzoquinones 3 and 4, exhibits extensive structural analogy to 2 and thus supports previous conceptions on the mechanism of purpurogallin formation.
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Dürckheimer et al. (1985) studied this question.
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