A process for the preparation of a compound of the formula ##STR1## in which X.sup.1 and X.sup.2 each independently is chlorine or fluorine, and Y is chlorine, bromine, fluorine or iodine, comprising subjecting a compound of the formula ##STR2## to a Sandmeyer or Balz-Schiemann reaction thereby to produce a carboxylic acid of the formula ##STR3## and converting the carboxylic acid (Ia) into an acyl chloride of the formula ##STR4## The compound (II) is new. The products are known intermediates for anti-bacterials.
一种制备式子为##STR1##的化合物的方法,其中X.sup.1和X.sup.2分别独立地为
氯或
氟,而Y为
氯,
溴,
氟或
碘,包括将式子为##STR2##的化合物经过Sandmeyer或Balz-Schiemann反应以产生式子为##STR3##的
羧酸,然后将
羧酸(Ia)转化为式子为##STR4##的酰
氯。化合物(II)是新的,该产品是抗菌剂的已知中间体。