(1.6 g, 9 mmol) in one portion and the reaction mixture was stirred at room temperature for 48 hrs. A further portion of N-bromosuccinimide (1.6 g, 9 mmol) was added and the solution was stirred at room temperature for a further 48 hrs. The reaction mixture was concentrated under reduced pressure and the resulting crude material purified by flash column chromatography (0-30% diethyl ether in cyclohexane) to elute the desired product as a white solid (0.65 g, 21%). ¹H NMR (400 MHz, CDCl3): δ 7.70 (s, 1 H), 7.50-7.29 (m, 10 H), 5.45-5.40 (m, 4 H).