[P:1]([Cl:5])(Cl)(Cl)=[S:2].C(N([CH2:11][CH3:12])CC)C.[CH3:13][C:14]1[CH:19]=[C:18]([CH3:20])[CH:17]=[CH:16][C:15]=1[OH:21]>C1(C)C=CC=CC=1>[P:1]([Cl:5])([O:21][C:15]1[CH:14]=[CH:19][C:18]([CH3:20])=[CH:17][C:11]=1[CH3:12])([O:21][C:15]1[CH:16]=[CH:17][C:18]([CH3:20])=[CH:19][C:14]=1[CH3:13])=[S:2]Thiophosphoryl chloride (17.0 g) was dissolved in toluene (250 cm3) and triethylamine (21.5 g) was added. The solution was stirred at 20° C. and 2,4-dimethylphenol (24.4 g) was added in portions during 1 hr. The mixture was stirred for 2 hr. and then heated and stirred at 80° C. for a further 2 hr. and then cooled and filtered to remove triethylamine hydrochloride. The toluene was distilled under reduced pressure leaving bis(2,4-dimethylphenyl) chlorothiophosphate (oil, 30.6 g. 31P NMR in CDCl3, singlet 54.57 ppm downfield of H3PO4).
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