申请人:Bayer Aktiengesellschaft
公开号:US04845288A1
公开(公告)日:1989-07-04
A process for the preparation of a hydroxybenzaldoxime O-ether of the formula ##STR1## in which R.sup.1 represents alkyl, comprising (a) in a first step, hydrogenating a nitro-benzaldoxime O-ether of the formula ##STR2## using the calculated amount of hydrogen in the presence of a catalyst and in the presence of a diluent, and (b) in a second step, reacting the amino-benzaldoxime O-ether of the formula ##STR3## thus obtained with a diazotizing agent in acidic, aqueous solution, and, without isolation, thermally hydrolyzing the resultant diazonium salt of the formula ##STR4## in which X.crclbar. represents an equivalent of an inorganic anion, in acidic, aqueous solution.
一种制备具有以下公式的羟基苯甲酰肟O-醚的方法,其中R.sup.1代表烷基,包括以下步骤:(a)在第一步中,在催化剂和稀释剂的存在下,使用计算的氢气量氢化具有以下公式的硝基苯甲酰肟O-醚;(b)在第二步中,在酸性水溶液中使用重氮化试剂反应所得的以下公式的氨基苯甲酰肟O-醚,且不分离,然后在酸性水溶液中热解所得的以下公式的重氮盐,其中X.crclbar.代表无机阴离子当量。