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A new formacetal linkage (ROCH 2 OR') forming reaction was developed, which exploited a combination of sulfide (R'OCH 2 SR'') and CuBr 2 -Bu 4 NBr. This reaction proceeded to give high yields under neutral conditions and was applied to the protection of alcohols, phenols and carboxylic acids by several types of α-oxymethyl groups.
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