A process for preparing by means of direct oxidation Arylpolyglykolcarbonsäuren

The invention relates to a process for the preparation of compounds of formula (I) R R X is an alkylene group having 2 to 4 carbon atoms, n is a number between 0 and 100, B is a cation or hydrogen, mean and / or the corresponding protonated carboxylic acids by one or more compounds of formula (II) wherein R