... Materials. ... mixture, and the residue was dissolved in 50 mL of 5% aqueous NaHCO 3 . The aqueous solution was extracted with diethyl ether (2 × 100 mL), acidified to pH = 5.0, and washed with ether until no more material could be ... OA Hazzazi, GA Attard and PB Wells, J. Mol. ...
