Tetrahedron p. 105 - 112 (1993)
Update date:2022-09-26
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Solid state ceric ammonium nitrate (CAN) oxidation of hydroquinones to the corresponding quinones, gives best results when operating with ultrasonic irradiation. Nitrogen dioxide plays a key role in these 'solid-solid' oxidations. The oxidation of hydroquinones to quinones can also be achieved in a unique 'solid-solid-solid' reaction, i.e., by using a limited amount of CAN in the presence of a full equivalent of a solid cooxidant such as KBrO3. Reduction of quinones with sodium dithionite in the solid state gives rise to the corresponding highly colored quinhydrones and, eventually, to hydroquinones.
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