Results 141 to 150 of about 2,134 (194)

Determination of cathinone, cathine and norephedrine in hair of Yemenite khat chewers

Forensic Science International, 2003
A sensitive and reproducible method for the quantitative determination of cathinone (CTN), norpseudoephedrine (NPE, cathine) and norephedrine (NE) from hair was developed. The compounds were extracted for 4 hours with phosphate buffer pH 2.0, followed by a standard solid phase extraction procedure on a mixed phase column, derivatization with ...
Frank Sporkert, Florian Masuhr, Lutz Harms   +2 more
exaly   +3 more sources

Naturally Occurring Norephedrine Oxazolidine Derivatives in Khat (Catha edulis)

Planta Medica, 2012
Khat (Catha edulis Forsk.) is a perennial shrub whose young leaves are chewed for their psychostimulating and anorectic properties. The main active principles of khat are believed to be the phenylpropylamino alkaloids, primarily (-)-cathinone [(S)-α-aminopropiophenone], (+)-cathine [(1S)(2S)-norpseudoephedrine], and (-)-norephedrine [(1R)(2S ...
Nativ Dudai, Efraim Lewinsohn, Yaron Sitrit   +2 more
exaly   +3 more sources

Determination of Amphetamine, Norephedrine, and Their Phenolic Metabolites in Rat Brain by Gas Chromatography

Journal of Pharmaceutical Sciences, 1984
A specific analytical procedure for the quantitation of amphetamine (I), norephedrine (III), and their amphoteric metabolites, p-hydroxy-amphetamine (II) and p-hydroxynorephedrine (IV), in biological samples using electron-capture gas chromatography (GC-EC) is described.
R T Coutts, Glen B Baker
exaly   +3 more sources

Trifluoromethyl analogs of amphetamine and norephedrine

Journal of Pharmaceutical Sciences, 1967
Trifluoromethyl analogs of amphetamine (I) and norephedrine (II) were synthesized for pharmacological evaluation. They showed no activity in profile tests for anorectic activity (I), antiemetic activity (I), CNS activity (I), MAO-inhibitory activity (I, II), and pressor activity (II).
R M, Pinder, A, Burger
openaire   +2 more sources

Conformational Behavior of Norephedrine, Ephedrine, and Pseudoephedrine

Journal of the American Chemical Society, 2009
A conclusive identification of the different conformers of the neurotransmitters ephedrine, norephedrine, and pseudoephedrine has been carried out in the gas-phase by molecular beam Fourier transform microwave (MB-FTMW) spectroscopy. Three conformers of norephedrine, three conformers of ephedrine, and four conformers of pseudoephedrine have been ...
Alonso, Jose L., Sanz Gonzalez, Maria, Lopez, Juan C., Cortijo, Vanessa   +3 more
openaire   +3 more sources

Über Aminoacyl‐norephedrine

Journal für Praktische Chemie, 1963
AbstractEs wird über die Synthese von Aminoacylderivaten des Norephedrins berichtet, die durch Umsetzung von N‐Phthalaminosöurechloriden mit Norephedrin gelingt.
Günther Drefahl, Helmut Arold, Günther Burckhardt   +2 more
openaire   +1 more source

Thermodynamic Parameters Associated with the Binding of Adrenalin and Norephedrine to Heparin

International Journal of Radiation Biology and Related Studies in Physics, Chemistry and Medicine, 1983
Pulse radiolysis has been used to determine the thermodynamic parameters (delta G', delta H' and delta S') governing the binding of adrenalin and norephedrine to heparin. These complexes were completely dissociated by increasing concentrations of inorganic salts. Lower concentrations of divalent cations (e.g. Ca2+) than of monovalent cations (e.g. Na+)
A K, Al-Ali, J D, Buchanan, D M, Power, J, Butler   +3 more
openaire   +2 more sources

Resolution of α-hydroxystannanes via norephedrine carbamates

Tetrahedron, 2002
Norephedrine carbamate derivatives of α-hydroxystannanes can be readily prepared and the resulting diastereomers are separable by column chromatography. Removal of the carbamate moiety by reduction provides enantiomerically-enriched α-hydroxystannanes.
Kevin W Kells, Nathan H Nielsen, Rosemary J Armstrong-Chong, J Michael Chong   +3 more
openaire   +1 more source

Quantum mechanical conformational analysis of heterocyclic analogues of norephedrine

Chemico-Biological Interactions, 1980
Studies on the conformation of several structural analogues of norephedrine, thiophene, carbazole and furan, were carried out using the differential PCILO method. The erythro-forms of these compounds possess minima on the conformation map corresponding to a gauche conformation with synclinal H-atoms.
J, Kaneti, D, Mihailova, K, Faitondzieva, L, Zheljazkov   +3 more
openaire   +2 more sources

X-Ray Powder Diffraction Data for (1R,2R) -(−)-norpseudoephedrine hydrochloride, (lS,2R)-(+)-norephedrine hydrochloride, and (±)-norephedrine hydrochloride

Powder Diffraction, 1992
Abstract X-ray powder diffraction data for the three title compounds are reported. The crystals of all three compounds are monoclinic and the space group is P2 1 (No. 4) in each case.
D.F. Rendle, E.J. Glazier, P.M. Cain
openaire   +1 more source