| 摘要 |
PURPOSE:To easily obtain the titled substance, by carrying out dehydrative dimerization reaction of hydroquinone in a water-immiscible solvent, contacting the liquid reaction mixture with water to extract unreacted hydroquinone and the titled substance to the water phase and precipitating the objective substance from the separated water phase. CONSTITUTION:Hydroquinone is subjective to dehydrative dimerization reaction in a water-immiscible solvent in the presence of a solid acid catalyst (e.g. synthetic mica, ion exchange resin, etc.). The resultant liquid reaction mixture is made to contact with water to extract the unreacted hydroquinone and the titled substance to water phase and the titled substance is precipitated from the separated water phase at <=50 deg.C. The amount of water to be contacted with the liquid reaction mixture is selected to be sufficient to dissolve the whole unreacted hydroquinone at >=70 deg.C and the contacting temperature is >=55 deg.C (preferably 70-90 deg.C). EFFECT:Thermal decomposition of the product is prevented because the separation is carried out without applying excessive heat. USE:Raw material for synthetic polymers, organic chemicals, etc.
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