Diphenylboric acid β ethylamino ester

Acetic acid, di-sodium hydrogen phosphate dihydrate, ethanol, Folin–Ciocalteu reagent, n-butanol, sodium acetate, sodium carbonate anhydrous, sodium dihydrogen phosphate, and TLC cellulose plates (catalog number 105552) were obtained from Merck^® (Darmstadt, Germany). Methanol was obtained from Fisher Chemicals^® (Leicestershire, UK). Fast blue B salt was obtained from Fluka^® (Buchs, Switzerland). Diphenylboric acid-β-ethylamino ester, eosin, gallic acid, glibenclamide, hematoxylin, isoflurane, paraffin, periodic acid, polyethylene glycol-400, protocatechuic acid, Schiff reagent, α-glucosidase, β-glucosidase, and p-nitrophenyl α-D-glucopyranoside were obtained from Sigma-Aldrich^® (Steinheim, Germany). 2-naphthyl-β-D-glucopyranoside was obtained from Aldrich^® (Milwaukee, WI, USA). 2-naphthyl-α-D-glucopyranoside was obtained from Glycosynth^® (Warrington, UK). Formalin solution, neutral buffered, 10%, was purchased from VWR Chemicals^®. All used reagents were of analytical grade.

Acetic anhydride, bismuth nitrate, and sodium nitrite were obtained from Panreac^® (Barcelona, Spain). Diphenylboric acid-β-ethylamino ester, fast blue B salt, gallic acid, iodine, oleanolic acid, polyethylene glycol-4000, protocatechuic acid, and vanillin were obtained from Sigma-Aldrich^® (Steinheim, Germany). Ethanol was obtained from Aga^® (Prior Velho, Portugal). Glacial acetic acid and sulfuric acid were obtained from Chem-Lab^® (Zedelgem, Belgium). Acetone, Folin–Ciocalteu reagent, hydrochloric acid 37% extra pure, iron trichloride, perchloric acid, potassium iodate GR, sodium carbonate, sodium hydroxide, and TLC cellulose plates (catalog number 105552) were obtained from Merck^® (Darmstadt, Germany). Butanol-1 and methanol were obtained from Fisher Chemicals^® (Leicestershire, UK). Ferrous sulfate was obtained from May and Baker LTD^® (Dagenham, UK). The (+)-Catechin (hydrate) was obtained from Cayman Chemical Company^® (Ann Arbor, MI, USA). Aluminum chloride was obtained from Fluka^® (Buchs, Switzerland). Acetonitrile was obtained from Honeywell Riedel-de Haën™ (Seelze, Germany). Formic acid 99–100% was obtained from VWR Chemicals (Fontenay-sous-Bois, France). All used reagents were of analytical grade.