Lithium acetonitrile exchange

Anion Exchange Resin Studies. Figure 5 shows the absorption spectra of U(VI) loaded into Dowex 1, X-4 (50 to 100 mesh) anion exchange resin from several acetate solutions. Both the triacetato and tetraacetato uranyl complexes are absorbed by the anion exchange resin. An increase in the fraction of triacetato complex occurs with an increase in the acetic acid concentration of the solutions. The fraction of each complex can be approximated by measuring the ratio of the absorbances at 460 m/x and 454 m/x and comparing with the values obtained in acetonitrile. This calculation is not exact because the spectra of the two pure species in the resin may be different from those in acetonitrile. In contact with 17.5M acetic acid the resin contains about 9% tetraacetato complex, in lOM acetic acid about 13%, and in IM acetic acid about 25%. This increase is also observed by the build-in of the tetraacetato peak at 494 m/x where the triacetato complex does not absorb. In solutions having a lithium acetate to acetic acid ratio of 1/2, the U(VI) in the resin was about 30% in the tetraacetato form from 0.16-3.0M lithium acetate. 

Dehydrohalogenation Benzyltrimethylammonium mcsitoate. r-Butylamine. Calcium carbonate. j Uidine. Diazabicyclo[3.4.0]nonene-5. N.N-Dimethylaniline (see also Ethoxy-acetylene, preparation). N,N-Dimelhylformamide. Dimethyl sulfoxide-Potassium r-but-oxide. Dimethyl sulfoxide-Sodium bicarbonate. 2,4-Dinitrophenylhydrazine. Ethoxy-carbonylhydrazine. Ethyldicyclohexylamine. Ethyidiisopropylamine. Ion-exchange resins. Lithium. Lithium carbonate. Lithium carbonate-Lithium bromide. Lithium chloride. Methanolic KOH (see DimethylTormamide). N-PhenylmorphoKne. Potassium amide. Potassium r-butoxide. Pyridine. Quinoline. Rhodium-Alumina. Silver oxide. Sodium acetate-Acetonitrile (see Tetrachlorocyclopentadienone, preparation). Sodium amide. Sodium 2-butylcyclohexoxide. Sodium ethoxide (see l-Ethoxybutene-l-yne-3, preparation). Sodium hydride. Sodium iodide in 1,2-dimethoxyethane (see Tetrachlorocyclopentadienone, alternative preparation) Tetraethylammonium chloride. Tri-n-butylamine. Triethylamine. Tri-methyiamine (see Boron trichloride). Trimethyl phosphite. 

Potassium phenyldiazenecarboxylate, an acidic ion-exchange resin, lithium chloride, and a Teflon-covered magnetic stirring bar are placed in flask B via the stopper and the system is evacuated for 15 min. Dry, degassed acetonitrile is distilled from flask A into flask B simply by chilling flask B... 

---