[Br:1][C:2]1[CH:7]=[CH:6][C:5]([OH:8])=[CH:4][CH:3]=1.[C:9](OC)(=[O:12])[CH:10]=[CH2:11].BrC1C=CC(OC(C)C(O)=O)=CC=1>CO.S(=O)(=O)(O)O>[Br:1][C:2]1[CH:7]=[C:6]2[C:5](=[CH:4][CH:3]=1)[O:8][CH2:11][CH2:10][C:9]2=[O:12]The title compound was prepared by the method of Canalini et al.2 by the reaction of 4-bromophenol (40 g, 0.23 mole) and methyl acrylate (100 ml) in the presence of Triton B (6 ml of a 40% solution in methanol); followed by dilute acid hydrolysis of the resulting ester and cyclisation of the (4-bromophenoxy)propionic acid in concentrated sulphuric acid. The product was recrystallised from petroleum ether (60°-80° C.) to give a white crystalline solid (6.80 g, 13%). M.p. 78°-80° C.
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