Results 111 to 120 of about 4,646,169 (243)

Use of tri-methylated-β-cyclodextrin and sub-2 μm silica particles for enantiomers separation by nano-liquid chromatography

Journal of Chromatography Open
A short capillary column packed with RP18 sub-2 µm particles was investigated for enantioseparation of selected racemic acidic compounds such as nonsteroidal anti-inflammatory drugs (carprofen, cicloprofen, fenoprofen, flurbiprofen, ibuprofen, indoprofen,
G. D’Orazio, S. Fanali
doaj   +1 more source

Enhanced Resolution in EPR Spectroscopy: Solid para‐Hydrogen Resolves Proton Hyperfine Splitting in the Diphenylphosphinyl Radical

ChemistryEurope, Volume 4, Issue 11, November 2026.
The diphenylphosphinyl radical 1 was investigated under matrix isolation conditions using IR, UV/Vis, and EPR spectroscopy. Solid para‐hydrogen was found to represent a powerful medium to resolve the hyperfine structure of a phosphorus‐centered π radical 1 by EPR spectroscopy.
Mika Maehara, Adrián Portela‐González, Kristin Wulff, Julian Eßer, André K. Eckhardt   +4 more
wiley   +1 more source

Investigations of polysaccharide carbamate-coated chiral stationary phases [PDF]

This thesis describes work carried out in order to increase knowledge concerning the influence of support structure and support surface chemistry on the enantioselectivity of cellulose tris(phenylcarbamate)-coated phases using high-performance liquid ...
Grieb, Sally Jane
core  

A walk in the park—Identifying healthy greenspaces using scents

PLANTS, PEOPLE, PLANET, Volume 8, Issue 6, Page 2121-2134, November 2026.
As urbanisation accelerates globally, access to nature is increasingly recognised as vital for public health and wellbeing. We captured and analysed plant‐emitted airborne ‘scent signatures’ across Oxford's urban greenspaces to assess their potential health relevance.
William T. Kay, Anya Lindström Battle, Mahal Humberstone, Molly Tucker, Kieran E. Storer, Geoffrey Kite, Katherine Willis   +6 more
wiley   +1 more source

An X‑Shaped Chiral Non‑Fullerene n‐Type Semiconductor: Application in Perovskite Solar Cells and Chirality‑Induced Spin Selectivity

Angewandte Chemie, Volume 138, Issue 43, 19 October 2026.
A highly electron‑accepting derivative of cyclobisbiphenylenecarbonyl (CBBC‐TIC) is reported. CBBC‐TIC functions as an electron‐transport layer for perovskite solar cells, achieving a power conversion efficiency of 20.6%. Furthermore, the enantiomers of CBBC‐TIC exhibited spin‐selective electron transport with high enantiospecific magnetic conductance ...
Yuki Sakamoto, Koki Otsuka, Kuraudo Ishihara, Shuang Li, Ai Shimazaki, Megumi Haramatsu, Junichiro Hirano, Juntaro Nogami, Hiroshi Shinokubo, Hiroki Uratani, Hironori Kaji, Fumitaka Ishiwari, Akinori Saeki, Tomoya Nakamura, Atsushi Wakamiya, Norihito Fukui   +15 more
wiley   +2 more sources

C11-Chirasil-Dex as chiral stationary phase in GC: enantioselective separation of cyclopropane derivatives

, 2005
Chirasil-â-Dex containing an undecamethylene spacer (C11-Chirasil-Dex) was used as chiral stationary phase (CSP) in enantioselective gas chromatography (GC). The versatility of the new stationary phase in the simultaneous enantiomeric separation of a set
Ghanem, A (15523544)
core   +2 more sources

The role of absorption in 3D electron diffraction dynamical structure refinement

Acta Crystallographica Section A, Volume 82, Issue 6, Page 409-418, November 2026.
This work establishes the role of absorption in 3D electron diffraction dynamical refinement, where its inclusion is shown to significantly affect refinement outcomes only in high‐Z materials at thicknesses approaching ξg.The role of absorption in 3D electron diffraction is established through analytical theory, simulation and dynamical refinement.
Benjamin Colmey, Tiarnan A.S. Doherty, Shreshth A. Malik, Paul A. Midgley   +3 more
wiley   +1 more source

A General Stereochemical Model for Grignard Additions to α‐Alkoxy Nitrones: Density Functional Theory Evidence for an Intrinsic α‐Chelation‐Controlled Pathway

European Journal of Organic Chemistry, Volume 29, Issue 40, 27 October 2026.
A comprehensive DFT conformational study of Grignard additions to α‐alkoxy nitrones reveals that the reaction proceeds through a dinuclear α‐chelated transition structure in which the nitrone oxygen coordinates two magnesium centers. Other common additives, such as zinc dichloride, boron trifluoride, and dimethylaluminum chloride, were also studied ...
Manuel Pedrón, Tomás Tejero, Pedro Merino   +2 more
wiley   +1 more source

High performance liquid chromatography on (R,R)-DACH-DNB chiral stationary phase using CO2 based eluents

, 1994
Fast and efficient sepns. of chiral stereolabile compds. were obtained at very low temp. on a π-acid chiral stationary phase, dinitrobenzoyl deriv. of diaminocyclohexane modified silica gel (R,R-DACH-DNB), using carbon dioxide-based mobile phases contg ...
Francesco Maggio, Francesco Gasparrini, Claudio Villani, G. P. MAPELLI, Domenico Misiti, F. ANDREOLINI, GASPARRINI, Francesco, F. MAGGIO, Franca Andreolini, VILLANI, Claudio, MISITI, Domenico, Gian Pietro Mapelli   +11 more
core   +1 more source

Enantioselektive Synthese von (1S,4R)-4-Hydroxycyclopent-2-enyl-acetat durch enzym-katalysierte Veresterung von cis-Cyclopent-2-en-1,4-diol mit Acetanhydrid. Gaschromatographische Untersuchungen zum Reaktionsmechanismus

CHIMIA, 1991
(1S,4R)-4-Hydroxycyclopent-2-enyl-acetate (1), an attractive starting material for the synthesis of prostaglandins, was readily prepared by an enzyme-catalyzed interesterification procedure using acetic anhydride as acylation agent.
Alexander Knoll, Monika Böhme, Steffen Merker, Gerd Fabian, Barbara Häfner, Fritz Theil   +5 more
doaj   +2 more sources