Preparation of 8: a Solution of N-(a-bromobenzylidene)-n¢-phenylhydrazine

(114 mg, 0.47 mmol) and NEt 3 (100 lL, 0.70 mmol) in toluene (10 mL) was added to a solution of hexafluoropropene (» 150 mg, 1 mmol) in toluene (10 mL) below ±50 C, and allowed to react at 100 C for 3 days in a pressure bottle (125 mL, Ace Glass Inc.). The crude product was purified by column chromatography (silica gel, hexane/benzene (9:1)) to give 8 as a yellow oil.