Question

Select the best conditions below for syn-dihydroxylation of an alkene to form a cis-1,2-diol. KMnO4 and...

Select the best conditions below for syn-dihydroxylation of an alkene to form a cis-1,2-diol.

KMnO4 and dilute sulfuric acid
a. MCPBA followed by water and acid
b. MCPBA followed by water and base
c. Oxymercuration-demercuration of an alkene
d. Hydroboration-oxidation of an alkene
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Answer #1

The best reagent is KMnO4 and dilute sulfuric acid.

Explanation: Reaction of alkene with KMnO4 and dilute sulfuric acid produces cis-diol as product.

Reaction of alkene with MCPBA followed by water and acid produces trans-diol as product. optoin A is not correct

Reaction of alkene with MCPBA followed by water and base produces trans-diol as product. so option B is not correct

Oxymercuration-demercuration and Hydroboration-oxidation of an alkene produces alcohol as prodict not a cis-diol. so option C and D are not correct.

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