I~IUSHES hS1)
~7~~EIS~~H2 reviewed studies on solvent extraction with acctylacctonc.
S~~cr~ar~-rsv
AS D TAnucnxacxtractcd some metal ions with acctylacetone for analytical purposes. Later, STARY hh'D lILADKY4 made a systematic investigation of solvent extraction with acctylacetone, bcnzoylacetonc and dibcnzoylmethanc and calculated the extraction constants. Thcnoyltrifluoracctonc can be used for the separation of the lanthanides5, and many other applications have heen discussedleo.
In the present work, some alkyl-substituted P-dikctones were synthesized and their extraction properties' wcrc 'examined. Extractions oE various metal ions with dipropionylmethanc, diisobutyrylmethanc, pivaloylacctylmcthane and dipivaloylmethane in benzene were investigated in order to establish the extraction constants. Thcsc constants could be used for the prediction of the optimum conditions for the separation of metals. Dipivaloylmethanc, one of the @-diketones studied here, has already been used for separation and determination of lithium in an alkaline earth solution' and for determination of rare earths by gas chromatography~.