| 摘要 |
A process for producing hydroxydiaryl ethers of the formula <IMAGE> wherein R respesents an alkyl group having 1 to 4 carbon atoms or chlorine, n represents 0, 1, 2, 3 or 4, and X represents a phenyl group of the formula II <IMAGE> or a 2-pyridinyl group or a 4-pyridinyl group of the formulae <IMAGE> wherein R1, R2 and R3 each represent hydrogen, an alkyl group having 1 to 4 carbon atoms, an alkyl group which has 1 to 4 carbon atoms and which is mono- or disubstituted by halogen, phenyl, halogen, carboxyl, alkoxycarbonyl having 1 to 4 carbon atoms in the alkyl group, trifluoromethyl, nitro, cyano or benzoyl, R4 and R5 each represent hydrogen, an alkyl group having 1 to 4 carbon atoms or phenyl, and R6 has all the meanings given, with the exception of halogen, for R1, R2 and R3 is disclosed. According to this process hydroxydiaryl ethers of the above formula are obtained by reacting a diether of the formula <IMAGE> wherein R, n and X have the meanings given above, in a polar aprotic solvent, in the presence of 0.1 to 1 mole of alkali per mole of diether of the above formula, with a dihydroxybenzene of the formula <IMAGE> wherein R and n have the meanings given above. The hydroxydiaryl ethers of the above formula can be used as intermediates for the production of alpha -(phenoxy-phenoxy)-alkanecarboxylic acid derivatives and alpha -(pyridyloxy-phenoxy)-alkane carboxylic acid derivatives, which have a herbicidal and plant-growth-regulating action.
|
