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Now showing items 41-50 of 105
Solvent Effects Of The Oxidation Of Iron (II) - Tartrate Complex By Molecular Oxygen In Aqueous Solutions Of Alcohols
(
Qatar University
, 1985 , Article)
The solvent effects on the oxidation of Fe(II)-tartrate by molecular oxygen have been investigated in aqueous acidic solutions of alcohols such as methanol, ethanol, isopropanol and t-butanol. The second-order rate constant ...
Proton And Carbon-13 Nuclear Magnetic Resonance Of Some 4-Amino-3-Alkyl (Aryl)-5-Thio-1,2,4-Triazolines And Their Derivatives
(
Qatar University
, 1991 , Article)
The proton and carbon-13 NMR spectra of some 4-amino-3-alkyl(aryl)-5-thio-1,2,4-triazolines, some 3-alkyl-5-thio- 1,2,4-triazolines and some 4-amino-3-aryl-5-thio-l,2,4-triazoles were measured in DMSO-d6 as solvent. The ...
The Structures And Mode Of Formation Of Some Cyclodiphosphazane Derivatives With Urea And Thiourea
(
Qatar University
, 1986 , Article)
The methods of preparation and possible reaction mechanisms for the formation of some geminal and nongeminal aminocyclodiphosph (v) azanes of the type (II - V) are discussed. These cyclodiphosphazanes obtained from the ...
Transmetalation Mechanisms
(
Qatar University
, 1993 , Article)
Transmetalation is the stoichiometric replacement of the metals in a polymetallic target T with different metals from reagents called transmetalators, TM. Transmetalation at useful rates under mild conditions is an excellent ...
Detection Of Small Amounts Of Lard In Other Animal Fats
(
Qatar University
, 1993 , Article)
The composition of fatty acids at the b-position (B-FA) and a, a' -positions of the. triacylglycerol was used to establish new criteria for the detection of small amounts of lard in other fats. Determination of P-FA was ...
A Packed Column Gas Liquid Chromatographic Method For Characterization And Determination Of Unsaponifiable Matter In Oils
(
Qatar University
, 1991 , Article)
A packed column GLC method for the detection and determination of the components of unsaponifiable matter in oils is described. Squalene, 8 -tocopherol and short chain hydrocarbons with up to 26 carbon atoms are determined ...
Synthesis And Spectroscopic Properties Of Some Mixed-Ligand Complexes Of Nickel (II), Copper (II), Zinc (II) And Palladium (II) With Biologically Active Nitrogen-Sulphur Containing Molecules
(
Qatar University
, 1990 , Article)
The reaction of the biologically active complexes, chloro-2-acetylpyridinehyd-razinecarbothiopiperidinamide metal (II) and chloro-2-acetylpyridinecar-bothiomorpholinamide metal (11),^, (M=Ni (II), Cu (II), Zn (II) and Pd ...
Investigation of Magnesium (II), Calcium (II) and Barium (II) Complexes in Aqueous Solution
(
Qatar University
, 2005 , Article)
The ionic association constants, K6, of Mg, Ca and Ba metal ions with succinate, malate and tartrate ligands were conduct metrically determined in water at 25-40°C. The conductometric data were analysed by the Shedlovsky ...
Synthesis And Reactivity Of Substituted Chromones
(
Qatar University
, 1992 , Article)
The synthesis of 2-methyl-and 2-Styryl-6-bromo-7, 8-benzochromone and 2, 6-Dimethylchromone and their reactivity towards cyclo-addition reaction under Diels-Alder conditions and towards nucleophilic and electrophilic ...
Thermometric Study of Inhibition of Aluminium Corrosion in Hydrochloric Acid Solution
(
Qatar University
, 1997 , Article)
The use of 6- amino - 4- (4-phenyl)-l,4- dihydro -3- methylpyrano [2,3- c] pyrazole -5- carbonitrile and some related compounds as corrosion inhibitors for aluminium in 2 M HCl solution was studied by the thermometric ...