Ketones react with Mg-Hg followed by treatmen | vedclass

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(B) The reaction of ketones with $Mg-Hg$ (magnesium amalgam) in the presence of a solvent like benzene leads to the formation of a magnesium pinacolat

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Pinacols

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(B) The reaction of ketones with $Mg-Hg$ (magnesium amalgam) in the presence of a solvent like benzene leads to the formation of a magnesium pinacolate complex.Upon subsequent hydrolysis (treatment with water),this complex yields a pinacol (a vicinal diol).The reaction is known as the pinacol reduction.For example,$2(CH_3)_2C=O$ $\xrightarrow{Mg/Hg} [(CH_3)_2C(O)]_2Mg$ $\xrightarrow{H_2O} (CH_3)_2C(OH)-C(OH)(CH_3)_2 + Mg(OH)_2$.

Ketones react with $Mg-Hg$ followed by treatment with water to give:

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