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Dihydroxylation of Alkenes

Cis-dihydroxylation of Alkenes: Proof of Mechanism

Hydroxylation of cyclohexene with osmium tetroxide or potassium permanganate exclusively gives cis-cyclohexan-1,2-diol with potassium permanganate.

Fig.1

This is proof that the permanganate ion attacks the alkene only from one side, resulting in the exclusive formation of cis diols .

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