Pyridine → HCID 19883544, compound

Participants

Reaction Steps

To a stirred solution of 17.3 parts of 2,2-dimethyl-1,3-dioxane-4,6-dione in 130 parts of dichloromethane were added 18 parts of pyridine under nitrogen atmosphere. Then there were added dropwise, during a 20 minutes-period a solution of 35.4 parts of 1-chloro-4,4-bis(4-fluorophenyl)-1-butanone in 65 parts of dichloromethane at about 0° C. while nitrogen gas was still introduced. Upon completion, stirring was continued first for 1 hour at about 0° C. and further for 1 hour at room temperature. Dichloromethane and water were added and the layers were separated. The organic phase was washed with water, dried, filtered and evaporated. The residue was boiled in 750 parts of a mixture of acetic acid and water (1:2 by volume) for 5 hours. Methylbenzene was added. The organic phase was separated, washed with water, with a sodium hydrogen carbonate solution and again with water, dried, filtered and evaporated. The residue was purified by column-chromatography over silica gel using trichloromethane as eluent. The pure fractions were collected and the eluent was evaporated, yielding 18.5 parts of 5,5-bis(4-fluorophenyl)-2-pentanone as a residue (intermediate 31).

Provenance & Evidence