Which of the following combinations can be used for the preparation of cis vic diol?
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Osmium tetroxide $\ce{(OsO_4)}$ is a volatile liquid that is most useful for the synthesis of $1,2$ diols from alkene.
The $\ce{OsO_4}$ is a catalyst. It reacts with the $\pi$ electrons of the alkene in a syn addition to form a cyclic osmate ester.
The $OH^-$ hydrolyzes the ester. This forms the cis$-$diol and $\ce{H_2OsO_4}.$
The $\ce{OsO_4}$ is a catalyst. It reacts with the $\pi$ electrons of the alkene in a syn addition to form a cyclic osmate ester.
The $OH^-$ hydrolyzes the ester. This forms the cis$-$diol and $\ce{H_2OsO_4}.$
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