“…Reaction of Compound 3f with Ethoxycarbonyimethylene-(tripheny1)phosphorane 2c.-A solution of compound 3f (0.3 12 g, 1 mmol) and the ylide 2c (0.348 g, 1 mmol) in dry dichloromethane ( 5 cm3) was stirred at room temperature for 24 h. After removal of the solvent the residue was chromatographed on silica gel with hexane4ichloromethane (1 : 1 up to 0: m) and 8.49-8.75 (3 H, m); m/z 352 (M', 83%), 324 (loo), 309 (12), 281 (9), 253 (10) and 252 (23).…”