SYNTHESIS OF 7-THIA-1-AZABICYCLO (4,3,0) NONANE DERIVATIVES VIA FREE RADICAL REACTION

Abstract

Several β-aminothiols were prepared by condensation of 3-piperideine and different thiiranes.     

Browder-type Theorems and SVEP

We study the new properties (b) and (gb), which we had introduced in [13], for an operator having the SVEP on the complement of distinguished parts of its spectrum. Classes of operators are considered as illustrating examples.     

Synthesis of a New Doxazosin‐Related Compound

A simple procedure for the synthesis of 1‐[4‐(2,3‐dihydro‐1, 4‐benzodioxin‐2‐yl) amide‐6, 7‐dimethoxy‐2‐quazolinyl]‐4‐(1,4‐bensodioxan‐2‐yl‐carbonyl) piperazine is described.     

Microwave Irradiation Plus Solid-Liquid Phase Transfer Catalysis Without Solvent: Further Improvement in Anionic Activation

Owing to cumulative effects of microwave irradiation and solid-liquid PTC without solvent methodology, conditions for alkylations of potassium acetate by n-octyl or n-cetyl halides are nearly quantitative within 2 minutes on appreciable quantities.     

On the interface boundary conditions between two interacting incompressible viscous fluid flows

We consider two incompressible viscous fluid flows interacting through thin non-Newtonian boundary layers of higher Reynolds? number. We study the asymptotic behaviour of the problem, with respect to the vanishing thickness of the layers, using Γ-convergence methods. We derive general interfacial boundary conditions between the two fluid flows. These boundary conditions are specified for some particular cases including periodic or fractal structures of layers.     

Impact of glycosylation on physico–chemical and biological properties of nitrification inhibitors

The lipophilic 2-mercaptobenzothiazole (MBT), known for its nitrification inhibition properties, was derivatized thanks to direct glycosylation reactions. Similar transformations were also performed starting from 2-mercaptobenzimidazole (MBI), structurally close to MBT. The resulting S-linked mono- or disaccharides derived from d-glucose or l-arabinose, and cellobiose, gentiobiose or lactose, respectively, were subsequently studied as novel nitrification inhibitors without any further formulation or physical processes, except dilution in water. Along with ecotoxicity measurements, inhibition properties of the synthesized water soluble glycoconjugates were studied in a model reactor containing nitrification bacteria. The best results were obtained for the gentiobiosyl derivatives simply dissolved in water.     

Additive maps preserving operators of inner local spectral radius zero

Let \({\mathcal {B}}(X)\) be the algebra of all bounded linear operators on an infinite dimensional complex Banach space \(X\) . We determine the form of surjective additive maps \(\varphi :{\mathcal {B}}(X)\rightarrow {{\mathcal {B}}(X)}\) which preserve operators of inner local spectral radius zero at points of \(X\) .     

Chiral ligand-exchange chromatography of amino acids using porous graphitic carbon coated with a dinaphthyl derivative of neamine

In this paper, we describe the preparation and the evaluation of a porous graphitic carbon (PGC) column coated with a new dinaphthyl derivative of neamine for chiral ligand-exchange (LE) chromatography. It was shown that the graphitic surface/dinaphthyl anchor system efficiently (1.15 μmol/m²) and stably (three months of intensive use) adsorbs the neamine template onto the chromatographic support. The resulting coated PGC stationary phase showed appreciable LE-based enantioselective properties towards several native amino acids. Chromatographic separation of methionine enantiomers using a dinaphtyl neamine-based ligand-exchange chiral stationary phase