Anodic oxidation of unsaturated α-stannyl ethers in Bu4NClO4–CH2Br2 results in effective cyclization and the introduction of bromide into one of the original olefinic carbons; a mechanism involving the coupling between the cyclized carbocation and Br– generated by cathodic reduction of CH2Br2 is suggested.
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Yoshida et al. (1994) studied this question.
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