[C:1]([OH:11])(=[O:10])[CH:2]=[CH:3][C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][CH:5]=1.[C:12]1([SH:18])[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=1.Br>C(O)(=O)C.O>[C:4]1([CH:3]([S:18][C:12]2[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=2)[CH2:2][C:1]([OH:11])=[O:10])[CH:5]=[CH:6][CH:7]=[CH:8][CH:9]=1Cinnamic acid (30.0 g.), benzenethiol (24.0 g.) and 45% w/v hydrogen bromide in acetic acid (21.5 ml) were heated together at 100° for 7 hrs. The reaction mixture was diluted with water and steam distilled to remove unchanged thiol. The hot aqueous layer was decanted from the oily product, which was recrystallised from 60°-80° petrleum ether to give 3-phenyl-3-(phenylthio)propionic acid (36.7 g) m.pt. 85°-90°. A sample recrystallised again from 60°-80° petroleum ether had m.pt. 88°-90°.
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