To convert a cyclic alkene into a diol, OsO4 followed by Na₂SO3 (or KMnO4, OH, H2O) is used.
OsO4, 25°C is used first to add hydroxyl groups to the alkene, forming a cyclic diol. Then, Na₂SO3 (or KMnO4, OH, H2O) is used to further oxidize the diol, resulting in the formation of the diol product.
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