Definition of pinacol
plural -s
1
: a liquid glycol (CH3)2C(OH)C(OH)(CH3)2 that forms a crystalline hexahydrate C6H12(OH)2.6H2O and that is usually made from acetone by reduction with amalgamated magnesium followed by hydrolysis of the intermediate magnesium derivative; 2,3-dimethyl-2,3-butanediol
2
: any of a series of tetrasubstituted derivatives of ethylene glycol obtained by reduction of ketones other than acetone
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