| 摘要 |
Hydroquinone mono-phenyl ethers, and their alkali metal salts of the formula <IMAGE> in which one of the radicals R1 and R2 denotes trifluoromethyl and the other denotes hydrogen or halogen and R3 represents hydrogen or an alkali metal cation or ammonium cation are prepared by reacting hydroquinone bis-phenyl ethers (bisphenoxybenzenes) of the formula <IMAGE> with hydroquinone derivatives of the formula <IMAGE> in which Cat denotes an alkali metal cation or ammonium cation and R4 denotes an alkali metal cation or ammonium cation or a (C1-C4)-alkyl group, in a polar aprotic solvent at temperatures from 120 DEG to 280 DEG C., and optionally, an alkyl group present in the R4-position is split off by treatment with an acid. |
