Results 41 to 50 of about 17,649 (161)

17O NMR Spectra of α,β-Unsaturated Carbonyl Compounds RCH=CHCOX: the Influence of Group X on the δ(17O) Value of the Carbonyl Oxygen and on the Shielding Effect of Group R

Molecules, 1999
17O NMR spectra of RCOX (R = Me, Ph), RCH=CHCOX (R = H, Ph, Me, CO2Et) and Me2C=CHCOX (X = H, Me, Et, i-Pr, t-Bu, Ph, PhCH=CH, OMe, OEt, Cl, CN, CF3, CO2Et) are reported.
Jin-Cong Zhuo
doaj   +1 more source

Quantitative Analysis of Substituent Effects in Cu(II) and Co(II) Benzimidazole Complexes: Stability Constants Determined via Acetate-Mediated Synthesis and Benesi–Hildebrand Method Correlated with Hammett σ Parameters

Chemistry
This study presents a quantitative investigation of substituent effects on the stability of 1:2 complexes formed between para-substituted 2-phenylbenzimidazole ligands and Cu(II) or Co(II) ions.
Zoltán Köntös, Flóra Stedra, Viktória Ngo Hang   +2 more
doaj   +1 more source

H1N1 2009 pandemic influenza virus: resistance of the I223R neuraminidase mutant explained by kinetic and structural analysis.

PLoS Pathogens, 2012
Two classes of antiviral drugs, neuraminidase inhibitors and adamantanes, are approved for prophylaxis and therapy against influenza virus infections. A major concern is that antiviral resistant viruses emerge and spread in the human population. The 2009
Erhard van der Vries, Patrick J Collins, Sebastien G Vachieri, Xiaoli Xiong, Junfeng Liu, Philip A Walker, Lesley F Haire, Alan J Hay, Martin Schutten, Albert D M E Osterhaus, Steve R Martin, Charles A B Boucher, John J Skehel, Steve J Gamblin   +13 more
doaj   +1 more source

Reaction and substituent constants for pyramidal inversion [PDF]

Tetrahedron Letters, 1973
Splitter, Janet S., Calvin, Melvin.
openaire   +2 more sources

Synthesis, Electrochemistry and Density Functional Theory of Osmium(II) Containing Different 2,2′:6′,2″-Terpyridines

Molecules
In coordination chemistry, 2,2′:6′,2″-terpyridine is a versatile and extensively studied tridentate ligand. Terpyridine forms stable complexes with a variety of metal ions through coordination sites provided by the three nitrogen atoms in its pyridine ...
Nandisiwe G. S. Mateyise, Marrigje M. Conradie, Jeanet Conradie   +2 more
doaj   +1 more source

Determination of the Ionization Constants of Some Benzoyl Thiourea Derivatives in Dioxane-Water Mixture

Journal of Chemistry, 2013
The stoichiometric ionization constants of N,N-dialkyl-N′-(4-substituted benzoyl) thiourea (Substitutes: H, Cl, and Br; alkyl groups: ethyl, n-propyl, n-butyl, and phenyl) derivatives have been determined potentiometrically in dioxane-water (v:v, 50:50 ...
Gun Binzet, Bülent Zeybek, Esma Kılıç, Nevzat Külcü, Hakan Arslan   +4 more
doaj   +1 more source

Atomic Charges from Machine-Learned Charge Densities: Consistency and Substituent Effects

Chemistry
Atomic charges are widely used to analyze molecular electronic structure and substituent effects, yet their numerical values and interpretations are inherently dependent on the adopted density partitioning scheme.
Xuejian Qin, Taoyuze Lv
doaj   +1 more source

Acid Dissociation Constants of Sulfanilamides and Substituent Effect on the Constant

YAKUGAKU ZASSHI, 1964
M, YOSHIOKA, K, HAMAMOTO, T, KUBOTA
openaire   +3 more sources

Introduction of the Difluoro(methoxy)methyl Group into the Aromatic Ring and the Study of Its Electronic Properties

Журнал органічної та фармацевтичної хімії
A simple and efficient method for synthesizing aromatic compounds with a difluoro(methoxy)methyl fragment (CF2OCH3) by the fluorodesulfurization of thionoesters has been developed.
Mykhailo O. Pashko, Yurii L. Yagupolskii
doaj   +1 more source

Steroid absorption - use of the substituent constant π'

Journal of Pharmacy and Pharmacology, 1977
M E, Pickup, A H, Beckett
openaire   +2 more sources