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Asolution of 4,4'-bipyridine (36 g, 0.23 mol) in 2.5 L ofdimethyl sulfoxide was added to a warm solution of HCl salt(260 g, 0.92 mol) of N-benzyl-para-chloromethylbenzyl-amine in dimethyl sulfoxide (2.5 L). The reaction mixturewas stirred under reflux for 48 hrs. The reaction progresswas detected by using UV/vis absorption spectra. A whiteprecipitate formed and was filtered off after the suspensionhad been cooled to room temperature. The solid was washedwith dimethylformamide and diethyl ether before beingdissolved in water. A saturated aqueous solution ofammonium hexafluorophosphate was added until no furtherprecipitation occurred. The white solid (4-H

Determination of Bisphenol A Using a Supramolecule and Photo-CIDNP