| 摘要 |
NEW MATERIAL:3,3-Bis(4-hydroxyphenyl)-cyclohexanol. USE:An intermediate for 3,4'-dihydroxybiphenyl, etc. PREPARATION:3-Hydroxycyclohexanone is normally condensed in the presence of a catalyst, such as hyrochloric acid, hydrogen chloride gas, sulfuric acid, phosphoric acid, toluenesulfonic acid, BF3, ZnCl2, AlCl3, SnCl4, or cation exchange resin having mobile acidic groups, etc., at 30-100 deg.C, preferably 40-80 deg.C temperature to afford the aimed 3,3-bis(4-hydroxyphenyl)-cyclohexanol. Furthermore, the reaction rate of the above-mentioned reaction can be increased by adding a cocatalyst, such as alkyl mercaptan. The raw material 3- hydroxycyclohexanone is obtained by reduction of resorcin, addtion reaction of water to cyclohexen-3-one or oxidation of 1,3-cyclohexanediol, etc. |
