Results 81 to 90 of about 75,340 (210)

A critical point in chiral chromatography-mass spectrometry analysis of ketamine metabolites. [PDF]

Drug Test Anal, 2021
Barbarossa A, Bardhi A, Gazzotti T, Pagliuca G.   +3 more
europepmc   +1 more source

Research Progress on the Development and Application of Cyclodextrin-Based Chromatographic Stationary Phases

Separations
This review systematically summarizes the novel preparation methods of cyclodextrin-based chromatographic stationary phases and their applications for chiral recognition in separation techniques such as capillary gas chromatography and high-performance ...
Wenlanqi Du, Jia Jia, Yinghong Zhao, Ailing Ning, Rongfu Huang   +4 more
doaj   +1 more source

The alpha-effect in cyclic secondary amines: new scaffolds for iminium ion accelerated transformations [PDF]

, 2009
Five-membered secondary amine heterocycles containing an α-heteroatom were prepared and shown to be ineffective as catalysts for the iminium ion catalysed Diels–Alder reaction between cinnamaldehyde and cyclopentadiene.
Cavill, Julie L., Elliott, Richard L., Evans, Gareth, Gibbs, Timothy J. K., Jones, Ian L., Platts, James A, Porzelle, Achim, Tomkinson, Nick   +7 more
core   +1 more source

Capillary electrochromatography applied to the separation of enantiomers utilizing packed capillary columns with silica-vancomycin. A tutorial

Journal of Chromatography Open
The separation and analysis of chiral compounds is an important topic in various fields such as research, pharmaceutical industry, food control, agrochemistry, biochemistry, forensics and toxicology, etc.
Chiara Fanali, Giovanni D'Orazio
doaj   +1 more source

From multimodal liquid chromatography to supercritical fluid chromatography: Mapping chiral separation of the major organic ultraviolet filters

Journal of Chromatography Open
The widespread presence of chiral organic UV filters in the environment raises critical concerns due to their potential enantioselective toxicity and persistence.
Leandro Oka-Duarte, Giovanni S. Baviera, Weston J. Umstead, Quezia B. Cass, Anderson R.M. de Oliveira   +4 more
doaj   +1 more source

Application of Carbon Nanotubes in Chiral and Achiral Separations of Pharmaceuticals, Biologics and Chemicals

Nanomaterials, 2017
Carbon nanotubes (CNTs) possess unique mechanical, physical, electrical and absorbability properties coupled with their nanometer dimensional scale that renders them extremely valuable for applications in many fields including nanotechnology and ...
Ayman L. Hemasa, Nenad Naumovski, William A. Maher, Ashraf Ghanem   +3 more
doaj   +1 more source

Preparation, Characterization and Reactivity of (3-Methylpentadienyl)iron(1+) Cations [PDF]

, 2007
The title cations (9 and 12) were prepared by dehydration of (3-methyl-2,4-pentadien-1-ol)Fe(CO)2L+ complexes. The structure of the (CO)2PPh3-ligated 12 was determined by single-crystal X-ray analysis. Reaction of carbon and heteroatom nucleophiles to (3-
Bennett, Dennis W, Chaudhury, Subhabrata, Donaldson, William, Haworth, Daniel T., Li, Shukun, Siddiquee, Tasneem   +5 more
core   +1 more source

Investigation of macrocyclisation routes to 1,4,7-triazacyclononanes : efficient syntheses from 1,2-ditosylamides [PDF]

, 2008
Two routes to the synthesis of a cyclohexyl-fused 1,4,7-triazacyclononane involving macrocyclisations of tosamides have been investigated. In the first approach, using a classic Richman-Atkins-type cyclisation of a cyclohexyl-substituted 1,4,7 ...
Gibson, C.L., Kennedy, A.R., McDavid, Colin L., Roux-Duplatre, Kewin, Sherrington, D.C., Stones, G., Tripoli, Régis   +6 more
core   +1 more source

Chromatographic Separation of Vitamin E Enantiomers

Molecules, 2017
Vitamin E is recognized as an essential vitamin since its discovery in 1922. Most vegetable oils contain a mixture of tocopherols and tocotrienols in the vitamin E composition. Structurally, tocopherols and tocotrienols share a similar chromanol ring and
Ju-Yen Fu, Thet-Thet Htar, Leanne De Silva, Doryn Meam-Yee Tan, Lay-Hong Chuah   +4 more
doaj   +1 more source

Synthetic Studies Directed Toward Streptenol D: Enantioselective Preparation of the 3,5-diacetoxy-6\u3cem\u3eE\u3c/em\u3e,8\u3cem\u3eE\u3c/em\u3e-decadiene Segment [PDF]

, 1998
The enantioselective preparation of 2-(3′R,5′R-diacetoxy-6E,8E-decadienyl)-1,3-dioxane, (+)-13, is described. This synthesis of the skeleton of streptenol D utilizes the ability of a diene-complexed (tricarbonyl)iron unit to serve as a protecting and ...
Dasgupta, Bireshwar, Donaldson, William
core   +1 more source