Претраживање
Приказ резултата 31-40 од 148
Biological activities of avarol derivatives, 1. Amino derivatives
(American Chemical Society, 1990)
Nine amino derivatives, compounds 3-11. of avarone were synthesized. Their antibacterial and cytotoxic activities are evaluated, and the results of a prescreen for antitumor effects are reported.
Oil/oil correlation based on gas chromatographic/mass spectrometric analysis of polycyclic biomarkers
(Rapid Communications in Mass Spectrometry, 1990)
Polycyclic biomarkers such as steranes, diasteranes and tri‐, tetra‐ and pentacyclic terpanes in the hydrocarbon fraction of oils were studied by gas chromatographic/mass spectrometric (GC/MS) analysis in order to correlate ...
Preparation and characterization of meridional isomers of uns-cis-(ethylenediamine-N,N'-di-3-propionato)cobalt(III) complexes with some β-amino acids
(Journal of the Serbian Chemical Society, 1996)
The meridional geometrical isomers of uns-cis-(ethylenediamine-N,N ′-di-3-propionato)cobalt(III) complexes with anions of β-alanine, β-amino-buteric and β-amino-isobuteric acids were prepared in the reaction of sodium ...
Influence of depyritization on NMR relaxation parameters of Aleksinac oil shale kerogen
(Elsevier Sci Ltd, Oxford, 1998)
Parallel proton and cross-polarization/magic-angle spinning (CP/MAS) nuclear magnetic resonance (NMR) relaxation measurements are reported on Aleksinac oil shale kerogen concentrate and pyrite-free kerogen concentrate. ...
Ring closure reaction of 4-tert-butyl-4-penten-1-ol with electrophilic reagents
(Natl Inst Science Communication, New Delhi, 1999)
The reaction of 4-tert-butyl-4-penten-1-ol 3 with some electrophilic reagents (such as mineral acids, mercuric acetate, peracids) has been investigated. It is found that in the acid (H2SO4) catalysed reaction of 3, the ...
The synthesis and characterization of facial and meridional isomers of unsym-cis-(ethylene diamine-N,N '-di-3-propionato)cobalt(III) complexes with natural aliphatic alpha-amino acids containing oxygen and sulfur
(Marcel Dekker Inc, New York, 1999)
In the reaction of sodium unsym-cis-(ethylenediamine-N,N'-di-3-Dropionato)(carbonato)cobaltate(III) dihydrate and the corresponding amino acid (S-serine, S-threonine, S-cysteine and R,S-methionine) at 70 degrees C, both ...
Ab initio calculations of the geometries and bonding energies of alkane and fluoroalkane complexes with tungsten pentacarbonyl
(Amer Chemical Soc, Washington, 1997)
Ab initio calculations of the bonding energies of alkanes and fluoromethanes to W(CO)(5) have been performed in several basis sets and at a variety of different levels of electron correlation. The Moller-Plesset second-order ...
Methane metathesis at a Cationic Iridium Center
(Amer Chemical Soc, Washington, 1996)
Pentagonal bipyramidal complexes of Co(II) with singly- and doubly-deprotonated 2 ',2 '''-(2,6-pyridindiyldiethylidene)dioxamohydrazide - The crystal structure of [diaqua-2 ',2 '''-(2,6-pyridindiyldiethylidene)dioxamohydrazidecobalt(II)] hexahydrate
(Gordon Breach Sci Publ Ltd, Reading, 1997)
This paper reports the first Co(II) complexes with a singly-and doubly-deprotonated H2L ligand (H2L = 2',2'''-(2,6-pyridindiyldiethylidene)dioxamohydrazide belonging to the planar pentadentate class. The complexes were ...
The preparation of an isoxazole derivative of 4-hydroxycoumarin
(Serbian Chemical Soc, Belgrade, 1998)
A method for preparation of an isoxazole derivative of 4-hydroxycoumarin, 3-phenyl-5-(4-hydroxy-3-coumarinyl)-isoxazole has been described. The reaction sequence includes addition of bromine to 3-cinnamoyl-4-hydroxycoumarin, ...