A process for the preparation of a hydroxybenzaldoxime O-ether of the formula ##STR1## in which R.sup.1 is alkyl, alkenyl or alkynyl comprising reacting a hydroxybenzaldehyde of the formula ##STR2## in the presence of an acid catalyst at a temperature between 50.degree. to 150.degree. C. with a ketoxime O-ether of the formula ##STR3## in which R.sup.2 and R.sup.3 each independently is an aliphatic cycloaliphatic or aromatic radical, or R.sup.2 and R.sup.3, together with the carbon atom to which they are bonded are cycloalkyl. Advantageously, the hydroxybenzaldehyde is 4-hydroxybenzaldehyde, the acid catalyst is a Lewis acid, the reaction is effected in a diluent at a temperature between 50.degree. and 100.degree. C., 1 to 10 mols of the ketoxime O-ether are present per mol of hydroxybenzaldehyde and the catalyst is present in 0.01 to 10 mol % based on the ketoxime O-ether. The products are intermediates for agricultural and pharmaceutical chemicals.
一种制备羟基
苯甲醛肟O-醚的方法,其
化学式为##STR1##其中R.sup.1为烷基、烯基或炔基,包括在存在酸催化剂下,在50℃至150℃的温度下,使
化学式为##STR2##的羟基
苯甲醛与
化学式为##STR3##的
肟O-醚发生反应,其中R.sup.2和R.sup.3各自独立地是脂肪环脂或芳香基,或者R.sup.2和R.sup.3连同它们结合的碳原子一起是环烷基。优选,羟基
苯甲醛是
4-羟基
苯甲醛,酸催化剂是
路易斯酸,反应在50℃至100℃的温度下在稀释剂中进行,每摩尔羟基
苯甲醛中存在1至10摩尔的
肟O-醚,并且催化剂以基于
肟O-醚的0.01至10摩尔%的浓度存在。产物是农药和制药
化学品的中间体。