反应详情

A mixture of 5.2 g of 2-fluorobenzoic acid, 2-(2-chlorophenyl)hydrazide, 64.3 g of triphenylphosphine, 500 ml of anhydrous acetonitrile and 19.3 ml of carbon tetrachloride was stirred at ambient temperature for 16 hours, concentrated in vacuo, and extracted with diethyl ether (4×200 ml). The extract was filtered and concentrated to an oil which, was flash chromatographed on silica utilizing hexane/ethyl acetate (25%) as the eluent. Concentration of the appropriate fractions yielded 47.5 g of α-chloro-2-fluorobenzaldehyde, (2-chlorophenyl)hydrazone.

1. concentrationconcentrated in vacuo
2. extractionextracted with diethyl ether (4×200 ml)
3. filtrationThe extract was filtered
4. concentrationconcentrated to an oil which
5. customchromatographed on silica