“…Colourless crystals, 0.27 g (75%), mp 315-317 °C (EtOH); ir (nujol): 3300, 1310, 1115 cm -1 ; 1 H nmr (CDCl 3 ): 6.37 (s, 1H), 7.43-7.98 (m, 9H); 13 C nmr (CDCl 3 ): 96.3, 116.1 (J CF = 22.0 Hz), 118. 8,122.1,123.7,123.7,130.3 (J CF = 8.6 Hz),130.7,132.4,137.5,144.6,163.7 (J CF = 247.8 Hz); ms: m/z 275 (M + , 40), 211 (100), 165 (19). Anal.…”