Potassium Bromide → alpha-(3,5-Di-tert-butyl-4-hydroxyphenyl)-N-(3-phenylpropyl)-aminomethylphosphonic acid

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Diethyl α-(3,5-di-tert-butyl-4-hydroxyphenyl)-N-(3-phenylpropyl)aminomethylphosphonate (compound 22, 3.0 g, 6.1 mmol) was heated at reflux in 30 ml NHCl for 24 h. The compound was extracted with chloroform, 2.5 g were obtained. Yield =94%, mp=162°-169° C. IR (KBr) 3640 cm-1 : OH, 3400 (broad): NH, 2800 and 1600: PO-H, 1430: tert-Bu, 1200: P=O, 1000 and 940: P--OH Elemental analysis: C24H36NO4P. % Calc. C 66.49 H 8.37 N 3.23 P 7.14 % Found C 66.69 H 8.52 N 2.95 P 6.91 0.2 % H2O

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