Stereochemistry and 13C NMR spectra of some phenyl selenoethers obtained in phenylselenoetherification of olefinic alcohols

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Low energy inelastic electron scattering from carbon monoxide: I. Excitation of the a³ Π, a'³ Σ ⁺ and A¹ Π electronic states

Differential scattering cross sections for electron excitation of the three lowest excited electron states of carbon monoxide are obtained experimentally using low-energy electron energy-loss spectroscopy and theoretically using the R-matrix method. The incident electron energies range from near-threshold of 6.3 eV to 20 eV. Experimental scattering angles range from 20° to 120°. The normalization of the experimental cross sections is made to available experimental elastic scattering data (Gibson et al 1996 J. Phys. B: At. Mol. Opt. Phys. 29 3197). The R-matrix calculations use three distinct close-coupling models and their results are compared to available experimental and theoretical cross sections. The overall comparison leads to significantly improved description of the excitation cross sections for this target

Cytotoxicity of Platinum(Iv) and Palladium(Ii) Complexes with Meso-1,2-Diphenyl-Ethylenediamine-N,N -Di-3-Propanoic Acid. Crystal Structure of [Pd(1,2-Dpheddp)] Complex

The syntheses of tetradentate ligand, meso-1,2-diphenyl-ethylenediamine-N,N-di-3-propanoic acid (H-2-1,2-dpheddp) and corresponding platinum(IV) and palladium(II) complexes are reported here. The spectroscopically predicted structure of the obtained palladium(II) complex was confirmed by X-ray analysis. Singe crystals suitable for X-ray measurements were obtained by slow crystallization from a DMSO-water mixture. Cytotoxic effects of platinum(IV), palladium(II) complexes and cisplatin on the 4T1 and Bl6F1 cell lines were determined using the MTT colorimetric technique. The complexes showed a dose dependence on cytotoxic effect toward both cell lines. Both complexes were less active than cisplatin, the exception was concentrations above 62.5 mu M of platinum(IV) complex in the B16F1 cell line

Event extraction of bacteria biotopes: a knowledge-intensive NLP-based approach

International audienceBackground: Bacteria biotopes cover a wide range of diverse habitats including animal and plant hosts, natural, medical and industrial environments. The high volume of publications in the microbiology domain provides a rich source of up-to-date information on bacteria biotopes. This information, as found in scientific articles, is expressed in natural language and is rarely available in a structured format, such as a database. This information is of great importance for fundamental research and microbiology applications (e.g., medicine, agronomy, food, bioenergy). The automatic extraction of this information from texts will provide a great benefit to the field

Synthesis of ferrocenylketyl radicals by chromium (II) complexes

Chromium(II)-imino-diacetate (IDA), -ethylenediaminetetra-acetate (EDTA) and -1,3-propanediamine-N,N'-diacetic-N,N'-dipropionate (PDADP) complexes were used as reagents in H2O-DMF solutions at 5 < pH < 7 for the preparation of ferrocenylketyl radicals, which could be isolated in solid form under argon in very good yields. Under similar reaction conditions chromium(II)-amino acid (glycine, alanine) complexes selectively reduced ferrocenyl ketones to the corresponding alcohols. (C) 2001 Elsevier Science B.V. All rights reserved

Synthesis of C₃-C₉-alkenyl 2,3-unsaturated glucosides from glucose and some alkenols

802-805C3-C9-alkenyl 2,3-unsaturated glucosides have been synthesized from glucose and C3-C9-alkenols by using Ferrier reaction with boron trifluoride etherate (BF3·Et2O) as Lewis acid catalyst in key step

<span style="font-size:12.0pt;font-family:"Times New Roman";mso-ansi-language:EN-US; mso-bidi-language:AR-SA" lang="EN-US">Synthesis of C₇-C₁₆-alkyl 2,3-dideoxy glucosides from glucose and fatty alcohols </span>

1242-1244C7-C16-alkyl 2,3-dideoxy glucosides have been synthesized from glucose and C7-C16-alkanols by Ferrier reaction using boron trifluoride etherate (BF3 . Et2O) as Lewis acid catalyst in key step. </span