Benz [a ¡anthracene (19d). The usual procedure using 17c and m-CPBA gave after chromatography 19d as colorless flakes: 90% yield; mp 165 °C; identical with an authentic sample (IR, UV, TLC, NMR, mmp = 165 °C).1,2,3,4,8,9,10,1 l-Octafluorobenz[a ¡anthracene (19e). To a magnetically stirred solution of 16 (0.700 g, 1.56 mmol) and 7b (0.292 g, 1.56 mmol) in dry THF (50 mL) under N2 at -78 °C was added dropwise via syringe phenyllithium (1.46 M in cyclohexane; 1.068 mL, 1.56 mmol). The solution was stirred for 1 h at -78 °C and then allowed to warm to room temperature over 3 h. The mixture was concentrated in vacuo and the residue dissolved in Et20 (250 mL). The Et20 solution was washed with H20 (5 X 50 mL), dried (Na2S04), and concentrated in vacuo to afford crude 13-methyl-l,2,3,4,8,9,10,ll-octafluoro-7,12-dihydrobenz[a]anthracen-7,12-imine (18a) as a brown paste. This material exhibited appropriate NMR and mass spectra. A solution of crude 18a and m-chloroperbenzoic acid (1 g, 5 mmol) in CHC13 (50 mL) was stirred under N2 at 20 °C for 24 h. The solution was concentrated in vacuo and the residue was chromatographed over activity basic alumina with hexane elution to afford 0.22 g (38% from 7b) of 19e as a yellow solid: mp 173-174 °C; UV (95% EtOH)