[CH2:1]([P:4]([CH3:9])(=[O:8])[O:5][CH2:6][CH3:7])[CH:2]=[CH2:3].C(=O)(O)[O-].[Na+].[Br:15][C:16](Br)=[N:17][OH:18]>C(OCC)(=O)C.O>[Br:15][C:16]1[CH2:3][CH:2]([CH2:1][P:4]([CH3:9])(=[O:8])[O:5][CH2:6][CH3:7])[O:18][N:17]=120 g (0.135 mol) of ethyl allyl(P-methyl)phosphinate are dissolved in 570 ml of ethyl acetate, 49.7 g (0.6 mol) of sodium bicarbonate in 115 ml of water are added and, while stirring vigorously, a solution of 40.6 g (0.2 mol) of dibromoformaldoxime in 115 ml of ethyl acetate is slowly added dropwise. The product is isolated in the form of an oil, 15 g from the ethyl acetate phase, and a further 19 g from the aqueous phase by extraction with dichloromethane at pH 2.
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