COC1C=CC([P:9]([C:12]2C=CC(OC)=CC=2)(=[O:11])[OH:10])=CC=1.[OH-:20].[CH2:21]([N+:25]([CH2:34][CH2:35][CH2:36][CH3:37])([CH2:30][CH2:31][CH2:32][CH3:33])[CH2:26][CH2:27][CH2:28][CH3:29])[CH2:22][CH2:23][CH3:24].C[CH:39]([OH:41])C>O>[OH:20][CH2:12][P:9]([CH2:39][OH:41])(=[O:11])[O-:10].[CH2:34]([N+:25]([CH2:21][CH2:22][CH2:23][CH3:24])([CH2:26][CH2:27][CH2:28][CH3:29])[CH2:30][CH2:31][CH2:32][CH3:33])[CH2:35][CH2:36][CH3:37]To a flask were added 2.0 g bis(4-methoxyphenyl)phosphinic acid, 3.0 g of a 55-60% solution of tetrabutylammonium hydroxide in water, 2.0 g of water and 18 ml 2-propanol. After heating to 50 C under nitrogen for 1 hour, the solvent was removed and another 20 ml of 2-propanol were added and removed by distillation under reduced pressure. A waxy solid was obtained.
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