申请人:Ciba-Geigy Corporation
公开号:US04214086A1
公开(公告)日:1980-07-22
A process for producing hydroxydiaryl ethers of the formula ##STR1## 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 ##STR2## or a 2-pyridinyl group or a 4-pyridinyl group of the formulae ##STR3## wherein R.sub.1, R.sub.2 and R.sub.3 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, R.sub.4 and R.sub.5 each represent hydrogen, an alkyl group having 1 to 4 carbon atoms or phenyl, and R.sub.6 has all the meanings given, with the exception of halogen, for R.sub.1, R.sub.2 and R.sub.3 is disclosed. According to this process hydroxydiaryl ethers of the above formula are obtained by reacting a diether of the formula ##STR4## 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 ##STR5## 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.
一种制备式为##STR1##的羟基二芳基醚的方法,其中R代表具有1至4个碳原子的烷基或氯,n代表0、1、2、3或4,X代表式II的苯基##STR2##或式##STR3##的2-吡啶基或4-吡啶基,其中R.sub.1、R.sub.2和R.sub.3分别代表氢、具有1至4个碳原子的烷基、具有1至4个碳原子的烷基且经单取代或双取代的卤素、苯基、卤素、羧基、具有1至4个碳原子的烷基的烷氧羰基、三氟甲基、硝基、氰基或苯甲酰基,R.sub.4和R.sub.5分别代表氢、具有1至4个碳原子的烷基或苯基,R.sub.6具有上述R.sub.1、R.sub.2和R.sub.3给出的所有含义,但卤素除外。根据该方法,在极性无水溶剂中,在每摩尔上述式的二元醚中加入0.1至1摩尔的碱,与式##STR5##的二羟基苯反应,即可获得上述式的羟基二芳基醚。上述式的羟基二芳基醚可用作α-(苯氧-苯氧)-烷基羧酸衍生物和α-(吡啶氧-苯氧)-烷基羧酸衍生物的中间体,其具有除草和植物生长调节作用。