[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([CH2:8][CH2:9][C:10]([OH:13])(O)[CH3:11])=[CH:4][CH:3]=1.[Br:14][CH2:15][C:16]1([C:21]2[CH:26]=[CH:25][C:24]([Cl:27])=[CH:23][C:22]=2[Cl:28])OCC[O:17]1.CC1C=CC(S(O)(=O)=O)=CC=1.C(O)CCC>O.CC1C=CC=CC=1>[Br:14][CH2:15][C:16]1([C:21]2[CH:26]=[CH:25][C:24]([Cl:27])=[CH:23][C:22]=2[Cl:28])[O:13][CH:10]([CH2:9][CH2:8][C:5]2[CH:4]=[CH:3][C:2]([Cl:1])=[CH:7][CH:6]=2)[CH2:11][O:17]1
A mixture of 11.2 parts of 1-[2-(4-chlorophenyl)ethyl]ethanediol, 15.6 parts of 2 -(bromomethyl)-2-(2,4-dichlorophenyl)-1,3-dioxolane, 4 parts of 4-methylbenzenesulfonic acid, 40 parts of butanol and 225 parts of methylbenzene is stirred and refluxed for 5 days with water-separator. The reaction mixture is evaporated and the residue is dissolved in 2,2'-oxybispropane. The solution is stirred with silica gel. The latter is filtered off and the filtrate is evaporated, yielding 2-(bromomethyl)-4-[2-(4-chlorophenyl)ethyl]2-(2,4-dichlorophenyl)-1,3-dioxolane as a residue.
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