Process for preparation of diphenyl ether compounds

一种由氟羧草醚生产氟磺胺草醚的方法，该方法包括如下步骤：(a)将氟羧草醚转化为它的酰基氯，(b)将由此形成的酰基氯与甲磺酰胺偶联形成粗氟磺胺草醚和(c)纯化粗氟磺胺草醚，该方法的特征在于各步骤都在单一的普通溶剂中进行，优选该溶剂为氯代烷烃。优选将所述各步骤压缩在一起，从而在得到氟磺胺草醚之前不对任何步骤的产物进行分离。 A process for producing fomesafen from acifluorfen comprises the steps of (a) converting acifluorfen to its acid chloride, (b) coupling the acid chloride so formed with methanesulphonamide to form crude fomesafen and (c) purifying the crude fomesafen, characterized in that each of the steps is carried out in a single common solvent, which is preferably a chloroalkane. Preferably the steps are telescoped together so that there is no isolation of the product for any step until fomesafen is obtained.