Studies into the generation and Diels-Alder reactions of 7,8-quinolyne with furan dienes

Reaction of an appropriate ortho-halo tosylate precursor with organolithium reagents provides the first conclusive route to the intermediate, 7,8-quinolyne. The transient existence of this hetaryne was confirmed by Diels-Alder reactions with furan derivatives that provide endoxide adducts. Chemical induced rearrangement of these adducts allows entry to key compounds of 10-hydroxy[h]benzoquinoline and its 7-substituted derivatives in modest yields.     

Effective separation of Am(III) and Cm(III) using a DGA resin via the selective oxidation of Am(III) to Am(V)

This paper deals with concept design and assessment of a process for the recovery of isotopically modified molybdenum from irradiated nuclear CerMet fuels containing the transuranium element oxides in a metallic molybdenum matrix. The recovery of isotopically modified Mo should enable re-use of this valuable resource especially in the case of uranium-free fuels/targets for accelerator-driven transmuters. The process concept proposed is a modification of the standard hydrometallurgical way of molybdenum processing. Further, the most significant expected radionuclidic impurities in the molybdate raffinate were predicted. Separation of these impurities from the concentrated molybdate solution will be described in the following parts of this mini-series.

     

Soluble aluminum in marine and fresh water by gas-liquid chromatography

The feasibility of determining the extractable aluminum contents of natural waters, with particular emphasis on sea water, by gas-liquid partition chromatography has been demonstrated. The metal is chelated with trifluoroacetylacetone, extracted into toluene and injected into the Chromatograph using direct on-column injection. Under optimized instrumental conditions, better than picogram quantities of aluminum as the trifluoroacetylacetone complex may be detected.     

Toward functionalized conducting polymers: synthesis and characterization of novel beta-(styryl)terthiophenes

Metal-catalyzed coupling methodologies have been employed in the synthesis of the key building block 3'-formyl-2,2':5',2"-terthiophene. Wittig olefinations with this aldehyde have produced five novel beta-styryl-substituted terthiophene monomers. These materials have been fully characterized by NMR spectroscopy, microanalysis, mass spectrometry, and X-ray crystal structure analysis. The results from the UV/visible spectroscopy and cyclic voltammetric investigations are reported.     

Collisional radiative model of helium including response to resonant radiation

A collisional-radiative model of helium has been developed that incorporates the effect of optical pumping with light that is resonant with an atomic transition. A steady-state solution of the collisional- radiative model with no pumping is used as an initial condition. The pumping radiation is switched on, and the population densities of the atomic levels are calculated as a function of time. Results are given for a wide range of plasma parameters and various pumping conditions.