SOLVENT-EXTRACTION OF ALUMINUM, GALLIUM AND INDIUM WITH 4-ACYL-3-PHENYL-5-ISOXAZOLONES

Five 4-acyl-3-phenyl-5-isoxazolones (AcyPI or HL) including three new compounds, 4-(4-toluoyl)-, 4-(4-fuluorobenzoyl)- and 4-(4-nitrobenzoyl )-3-phenyl-5-isoxazolones (TPI, FBPI and NBPI, respectively), were syn thesized. The extraction of aluminium(III), gallium(III) and indium (I II) into benzene with the synthesized AcyPI has been investigated. The acid dissociation constants, K(a), and the partition coefficients, K( D), of AcyPI and the extraction constants, K(ex), of their metal compl exes were determined. The introduction of an electron-withdrawing fluo ro or nitro group to the 4-position of the benzene ring in the acyl mo iety of AcyPI was very effective for increasing the K(a) value of AcyP I, but scarcely affects the K(D) value. The extracted species were ML3 in all the extraction systems, where M denotes the metal ion.