Capillary electrophoretic study of synthesis of polyhexamethyleneguanidine

Synthesis of polyhexamethyleneguanidine hydrochloride was studied by capillary electrophoresis. A procedure for determining the reaction components was developed.     

Simple route to secondary amides of phosphorylacetic acids and their use for extraction and sorption of actinides from nitric acid solutions

An efficient method for the synthesis of secondary alkylamides of phosphorylacetic acids (APA) was proposed. The method involves amidation of ethyl phosphorylacetates with primary aliphatic amines. The scope of reaction was determined. Reactions with ethylenediamine and 1,4-diaminobutane yield the corresponding bisamides; in the case of 1,3-diaminopropane, N-(3-aminopropyl)diphenylphosphorylacetamide or N,N-propylenebis(diphenylphosphorylacetamide) was obtained, depending on the reaction conditions. The extraction of americium(III) complexes and the sorption of uranium(VI) by sorbents with physically sorbed APA from nitric acid solutions were studied. There is no correlation between the partition coefficient of americium(III) and the structure of APA; in the sorption of uranium(VI), the degree of extraction depends on the complexone structure.__________Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 2394–2402, November, 2004.     

Synthesis of polyfunctionalized methylphosphine oxides

N,N-Dialkylamino(diphenylphosphoryl)chloromethanes, a new type of organophosphorus compounds, were synthesized. On dissolving in polar and low polar solvents, N,N-dialkylamino(diphenylphosphoryl)chloromethanes dissociate spontaneously with the P??C bond cleavage to form the diphenylphosphinite anion Ph₂PO^?. This was confirmed by the reaction of N,N-dimethylamino(diphenylphosphoryl)chloromethane with electrophilic substrates to form the corresponding addition or substitution products of Ph₂PO^?. The capability of spontaneous generating the diphenylphosphinite anion considers accessible N,N-dimethylamino(diphenylphosphoryl)chloromethane as a synthetic equivalent of the diphenylphosphinite anion.     

Measurement of the <Superscript>14</Superscript>C Content in Liquid Scintillators by Means of a Small-Volume Detector in the Low-Background Chamber of the Baksan Neutrino Observatory

A setup for measuring natural-radioactivity backgrounds and ultralow concentrations of the isotope ¹⁴C in samples of a liquid organic scintillator was created at the low-background laboratory of the Baksan Neutrino Observatory (Institute for Nuclear Research, Russian Academy of Sciences) at a depth of 4900 mwe. The concentration of the radiocarbon ^14C in a sample of a scintillator based on domestically produced linear alkylbenzene was measured, and it was found that ¹⁴C/¹²C (3.3 ± 0.5) × 10^?17.     

Reaction of (2-methoxyprop-2-yl)diphenylphosphine oxide with alkyl bromides

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Novel Template Sorbents for Separation of Americium(III) from Nitric Acid Solutions: Search of Optimal Ion‐Imitator of AmIII

A series of new template sorbents that enable selective and effective sorption of Am^III from 0.5 to 4M HNO₃ solutions containing high concentrations of Fe^III and Zr^IV was synthesized from (ethenyl)(diphenyl)phosphine oxide. La^III, Ce^III, and Pr^III were used as template elements imitating the properties of Am^III. The highest efficiency of separation of Am^III from high amounts of Fe^III and Zr^IV was displayed by the Ce^III‐based sorbent.     

Gadolinium(III) 3,5,5-trimethylhexanoate complexes for creation of stable Gd-loaded liquid organic scintillators

Optimal conditions have been found for the synthesis of a gadolinium 3,5,5-trimethylhexanoate complex for creation of stable Gd-loaded scintillators. Procedures for the preparation of gadolinium concentrates containing 10–20 g/L Gd in a linear alkylbenzene have been developed, and their stability has been studied. The structure of gadolinium complexes deposited from the concentrates prepared by extraction has been determined.