In the presence of K~2CO~3, reaction of (α-furoyl) methyl- arsoniumbromide (1) with methyl 2-perfluoroalkynoates (2) in methylene chloride at 0-5℃ afforded the adduct --- methyl 4-(α -furoyl)-2- triphenylarsoranylidene-3-perfluoroalkyl-3-butenoates (3) in high yield. Hydrolysis of 3 in V(CH~3OH) : V (H~2O)=9 : 1 methanolic solution at room temperature, 70℃ and 120℃ in a sealed tube respectively, 4-perfluoroalkyl-6-(α-furyl)-2-pyranones (4) and methyl 4-(α -furoyl)-3-perfluoroalkyl-3-butenoates (5) were obtained in excellent yield. Compounds 4 and 5 could be separated by column chromatography. 5 is a mixture of Z- and E- isomers which couldn't be separated by column chromatography, but the ratio of Z- and E- isomers could be estimated by ^1H NMR. The catalytic hydrolysis of compound 3 with silica gel and the mechanisms for the formation of products are also discussed in this paper.

Key words: PHOSPHINE, HYDROLYSIS, FURAN P, PYRANONE P, POTASSIUM CARBONATE, PROTON MAGNETIC RESONANCE SPECTROMETRY, REACTION MECHANISM