An improved process for preparing o-chloromethylphenylglyoxylic esters of the formula
which comprises converting a compound of the formula
by reaction with magnesium into the corresponding Grignard reagent which is then reacted with a compound of the formula
to give the compound of the formula
which is then cleaved by reaction with a chloroformic ester of the formula CICOOR4 or by reaction with phosgene to give the compound of the formula (I), followed by the isolation of the compound of the formula (I), and also an improved process for preparing (E)-2-(2-chloromethylphenyl)-2-alkoximinoacetic esters of the formula
and intermediates for their preparation.
一种改进的制备o-
氯甲基苯甘酸酯的方法,其包括将化合物反应转化为相应的Grignard试剂,然后与化合物反应,得到化合物,然后通过与公式CICOOR4的
氯甲酸酯反应或与
光气反应裂解化合物,得到化合物(I),随后分离化合物(I),以及制备(E)-2-(2-
氯甲基苯基)-2-烷氧基
亚乙酸酯的改进方法,以及其制备中间体的方法。