Suitable reagent for above reaction is :

Engineering

Chemistry

Alkene

Question

Suitable reagent for above reaction is :

(i) dil. alk. $KMn \overset{18}{O_{4}}$

(i) $OS \overset{18}{O_{4}}$ (ii) H₂O / NaHSO₃

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The reaction shows syn-dihydroxylation of an alkene, adding two OH groups across the double bond with syn stereochemistry. Osmium tetroxide (OsO₄) is the classic reagent for this transformation, followed by reductive workup with NaHSO₃ or H₂S to regenerate OsO₄ and yield the syn diol. Dilute alkaline KMnO₄ also gives syn dihydroxylation but can lead to over-oxidation. The correct reagent is OsO₄ followed by NaHSO₃/H₂O.

Final Answer: $OsO 4_{}$ (ii) H₂O / NaHSO₃