hexanes the title compound was prepared as a clear liquid 0 29 g 41 ms ci nh 3 m e 187 m nh 4 4 nitrophenol 0 10 g 0 72 mmol aldrich sodium chlorodifluoroacetate 0 11 g 0 72 mmol alfa products and sodium hydroxide 0 03 g 0 72 mmol were combined in dry dmf 1 ml under an atmosphere of argon after stirring at 125 u00b0 c for 1 h the mixture was cooled to rt was diluted with water and was extracted twice with ether the combined organic extracts were washed twice with brine were dried mgso 4 filtered and evaporated the residue was purified by flash chromatography silica gel 25 ethyl acetate hexanes to provide the title compound as a white solid 0 10 g 73 mp 33 u00b0 35 u00b0 c following the procedure of example 3 except substituting 3 nitrophenol aldrich for 4 nitrophenol and purification by flash chromatography silica gel 16 ether hexanes the title compound was prepared as a clear yellow liquid 0 41 g 60 ms ci nh 3 m e 207 m nh 4 3 4 dihydroxybenzaldehyde 0 50 g 3 62 mmol aldrich sodium chlorodifluoroacetate 0 55 g 3.