I'm trying to sulfonate diphenic acid using trimethylsilyl chlorosulfonate to obtain a water soluble form of diphenic acid by forming the corresponding sodium or potassium salt. I tried using the procedure described by the Ivan et. al in 2017 (DOI: 10.1039/c7sc00430c). But it is not working for diphenic acid. Could anyone suggest or direct me to a procedure that I can use for the sulfonation of diphenic acid using above reagent ?

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