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BOND ET AL.The liquidJIiquid extraction of Am(III) from hydrochloric acid solutions with chloroform solutions of2,6-bis[(diphenylphosphino)methyJ]pyridine N,P,P'-trioxide (ENOPOPO) is described. ENOPOPO exhibits modest extraction ability for arnericium(lII) (D Am=2.2 at 5 M HCI) and can be efficiently back extracted from the organic phase at 0.1 M HC!. The ligand dependency data suggest that three ligand molecules are coordinated to the americium in the extraction complex. Additional aspects of the extraction mechanism are described.

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The reaction of N 4 P 4 Cl 8 1 with the difunctional reagents 2,2Ј-methylenebis(4,6-di-tert-butylphenol) (as its disodium salt) and N,NЈ-diisopropylpropane-1,3-diamine gave the spirocyclic products 2,2-N 4 P 4 {[