Process for the preparation of a quinoline carboxylic acid The invention provides a process for the preparation of a carboxylic acid of formula (IV) (which is useful as a safener for herbicides): wherein R1 is hydrogen or chlorine, comprising the steps of: (i) subjecting a compound of formula (V) wherein: R1 is as defined above;and R2 is C1-C18 alkyl;C1-C6 alkoxyC1-C8 alkyl-;optionally substituted phenyl; or optionally substituted benzyl; to hydrolysis under acidic conditions to give a solution of a quinolinium salt;and (ii) addingbase to the solution obtained in step (i) to give the free carboxylic acid (IV). The invention also provides a solid (e.g. particulate) form of one quinoline carboxylic acid compound within formula (IV) defined by R1 being chlorine;and novel intermediates useable in the above process.
制备
喹啉羧酸的方法。该发明提供了一种制备式(IV)的
羧酸的方法(作为
除草剂安全剂有用):其中R1是氢或
氯,包括以下步骤:(i)将化合物(V)暴露于酸性条件下
水解,得到
喹啉盐的溶液;和(ii)向步骤(i)中得到的溶液中加入碱,得到游离的
羧酸(IV)。该发明还提供了一种固体(例如颗粒)形式的一种
喹啉羧酸化合物,其在式(IV)中由R1为
氯定义;以及上述过程中可用的新中间体。