Results 241 to 250 of about 1,903,576 (294)

Chromium-catalyzed oxidations in organic synthesis

Chemical Reviews, 1992
Chromium oxidations have been widely explored since the very beginning of organic chemistry, and the topic remains of current interest as exemplified by the extensive number of papers in which at least one step involves the w e of an oxochromium(V1) reagent.
exaly   +2 more sources

Chromium (III) and chromium (VI) removal and organic matter interaction with nanofiltration

Science of The Total Environment, 2023
Chromium (Cr) is a toxic inorganic contaminant for drinking water, in which the concentration has to be controlled for human health and safety. Cr retention was investigated with stirred cell experiments using sulphonated polyethersulfone nanofiltration (NF) membranes of different molecular weight cut-off (MWCO). Cr(III) and Cr(VI) retention follow the
Boussouga, Youssef-Amine, Okkali, Timur, Luxbacher, Thomas, Schäfer, Andrea I.   +3 more
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Chromium arene complexes in organic synthesis

Chemical Society Reviews, 2007
The complexation of an arene to a chromium tricarbonyl unit changes its chemical behavior, giving rise to unprecedented transformations. The electron-withdrawing effect of the unit allows efficient nucleophilic attack (S(N)Ar and dearomatization reactions), stabilizes negative charges in benzylic positions and activates C(Ar)-halogen bonds for cross ...
Marta, Rosillo, Gema, Domínguez, Javier, Pérez-Castells   +2 more
openaire   +2 more sources

Ultrastable High-Connected Chromium Metal–Organic Frameworks

Journal of the American Chemical Society, 2021
State-of-the-art MOFs are generally known for chemical stability at one end of the pH scale (i.e., pH < 0 or pH > 14). Herein, we report new Cr-MOFs capable of withstanding extreme pH conditions across approximately 16 pH units from pH < 0 to pH > 14, likely the largest observed pH range for MOFs. The integration of multiple stability-enhancing factors
Huajun Yang, Fang Peng, Anh N. Hong, Yanxiang Wang, Xianhui Bu, Pingyun Feng   +5 more
openaire   +2 more sources

Enhanced Organically Bound Chromium Yeast Production

Journal of Agricultural and Food Chemistry, 2000
This paper describes continuous and fed-batch fermentation protocols for enhanced production of organically bound chromium yeast. During continuous fermentation, several inorganic chromium compounds were evaluated. Sodium chromate demonstrated the best chromium incorporation into yeast biomass without any precipitation in the fermentation medium ...
A, Demirci, A L, Pometto III
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The preparation of organically functionalised chromium and nickel nanoparticles

Chemical Communications, 2001
Nanoparticles of chromium or nickel have been prepared by the reduction of either CrCl2 or Ni(acac)2 (acac = pentane-2,4-dionate) at elevated temperatures in various Lewis base solvents; the effect of the Lewis base, which acts as both a reaction solvent and passivating ligand on morphology are apparent; the nanostructures have been analysed by NMR, IR,
Green, M, O'Brien, P
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Chromium aminocarbene complexes in organic synthesis

Journal of Organometallic Chemistry, 1991
Abstract The synthesis, the physical and spectroscopic properties, and the thermal and photochemical reactions of chromium aminocarbene complexes are reviewed, with an emphasis on the authors' research in the area.
Mark A. Schwindt, James R. Miller, Louis S. Hegedus   +2 more
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Chromium(V) oxidations of organic compounds

Inorganic Chemistry, 1985
Oxydation de composes organiques (diacides carboxyliques, hydroxy- et cetoacides, alcools, aldehydes et divers) par le complexe bis-[ethyl-2 hydroxy-2 butanoato (2-)] oxochromate(V) de ...
Miroslav Krumpolc, Jan Rocek
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In vitro Metabolism and Permeation Studies in Rat Jejunum: Organic Chromium Compared to Inorganic Chromium

Journal of Trace Elements in Medicine and Biology, 1999
The purpose of these studies was to compare the in vitro absorption of two inorganic chromium(III) compounds: chromium chloride and chromium nitrate, with organic chromium(III)-picolinate; and to investigate if any in vitro metabolism of chromium(VI) takes place.
Gammelgaard, Bente, Jensen, K, Steffansen, B   +2 more
openaire   +3 more sources