[CH3:1][C:2]1[CH:7]=[CH:6][CH:5]=[C:4]([CH3:8])[C:3]=1[S:9][CH2:10][CH2:11]O.P(Br)(Br)[Br:14]>C(Cl)(Cl)Cl>[CH3:1][C:2]1[CH:7]=[CH:6][CH:5]=[C:4]([CH3:8])[C:3]=1[S:9][CH2:10][CH2:11][Br:14]18.2 g of 2-(2,6-dimethyl phenylthio) 1-hydroxy ethane and 50 ml chloroform are added in a flask and when the mixture is perfectly clear, it is cooled to 0°. To the solution 14.3 g of phosphorous tribromide are added while keeping the temperature to about 0°. After completion of the addition, the inner temperature is let to revert at ambiant temperature then heated to reflux for one hour.
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