Which product characterizes the mild oxidation of alkenes with KMnO4?

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Multiple Choice

Which product characterizes the mild oxidation of alkenes with KMnO4?

Mild oxidation with permanganate adds oxygen across the carbon–carbon double bond in a syn fashion, giving a vicinal diol (1,2-diol). The cold, dilute KMnO4 conditions hydroxylate the alkene without breaking the C=C, so the two new OH groups appear on adjacent carbons on the same face. This syn dihydroxylation is the hallmark product under these gentle conditions. If the oxidant were hotter or more concentrated, the double bond could be cleaved and converted to ketones or carboxylic acids, which is why those products appear only under harsher treatment. Epoxide formation isn’t the typical outcome for standard mild permanganate oxidation; that kind of product usually comes from other oxidants.

Mild oxidation with permanganate adds oxygen across the carbon–carbon double bond in a syn fashion, giving a vicinal diol (1,2-diol). The cold, dilute KMnO4 conditions hydroxylate the alkene without breaking the C=C, so the two new OH groups appear on adjacent carbons on the same face. This syn dihydroxylation is the hallmark product under these gentle conditions. If the oxidant were hotter or more concentrated, the double bond could be cleaved and converted to ketones or carboxylic acids, which is why those products appear only under harsher treatment. Epoxide formation isn’t the typical outcome for standard mild permanganate oxidation; that kind of product usually comes from other oxidants.

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