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Anodic oxidation in a mixed solvent of acetic acid and acetic anhydride containing a variety of styrene derivatives, small amounts of Mn(OAc)2·4H2O and Cu(OAc)2·H2O brought about a facile carboxymethylation to give the corresponding γ-butyrolactones as the main products in good yields.
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Shundo et al. (1991) studied this question.
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