Cl.[C:2]1([P:8]2(=[O:14])[CH2:13][CH2:12][NH:11][CH2:10][CH2:9]2)[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.CC[NH+](CC)CC.CC[NH+](CC)CC.C([O-])([O-])=O>O>[C:2]1([P:8]2(=[O:14])[CH2:9][CH2:10][NH:11][CH2:12][CH2:13]2)[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1To a 500 mL round-bottom flask was added 4-phenyl-[1,4]azaphosphinane 4-oxide hydrochloride salt (5.91 g, 25.6 mmole), MP-carbonate resin (20 g, 2.9 mmole/g), and water (200 mL). The flask was sealed with a plastic stopper and placed on an orbital shaker for 12 hours. The resin was then removed by filtration with though a glass frit, and washed with water (40 mL) to provide 4-phenyl-[1,4]azaphosphinane 4-oxide free-base as an aqueous solution.
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