Prompt chelation therapy after incorporation of z39Pu, 24"Am, 242Cm and '"Cf, respectively, was tested in rats. For 239Pu, especially in the bone, desferrioxamine-Bmethane sulfonate (DFOA) is superior to calcium diethylenetriaminepentaacetate (Ca-DTPA): the combination of both is equally effective as DFOA, but the presence of Ca-DTPA prevents translocation of 239Pu to the kidneys occurring with DFOA alone. DFOA further decreases retention of ' "Cf in the liver, but it does not affect tissue retention of 241Am and 242Cm.
Variable-temperature 13C n.m.r. spectra of 3,7-dialkyl-1,5-diazabicyclo[3.3.l]nonan-9-ones unambiguously establish a boat-chair + chair-boat equilibrium rather than the fixed double-chair conformation which had previously been proposed.
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