تصفح Qatar University Science Journal - [From 1981 TO 2007] حسب الموضوع "الكيمياء العضوية"
السجلات المعروضة 1 -- 11 من 11
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Allelopathic Effect Of Glossonema Edule (Asclepiadaceae) On Associated Flowering Plants And Rhizosphere Fungi In Qatar
( Qatar University , 1994 , Article)Laboratory experiments were conducted to determine whether there were allelopathic effects of Glossonema edule (Asclepiadaceae) on six associated flowering plant species and three soil fungi. The tested species were the ... -
Application Of Different Methods For The Preparation Of Chlorophyll Pigments For Food And Pharmaceutical Industries
( Qatar University , 1994 , Article)The main objective of this work is to establish an economic and applied technique for the production of chlorophyll pigments and their derivatives namely Cu-chlorophyll complex in the form of colour additives. These trials ... -
Comparative studies of the oil from silybum marianum cultivated in Egypt using glc
( Qatar University , 1994 , Article)Quantitative comparative study of the oil fraction constituents in the fruits of Silybum marianum successfully cultivated in new reclaimed land with those of the two wild types viz., purple flower and white flower bearing ... -
Constituents of plants growing in qatar xxv flavonoids of Picris Radicata (forssk.) Less.
( Qatar University , 1994 , Article)Four flavonoids were isolated from the plant and were identified as apigenin, chrysin 7-glucoside, leuteoline and luteolin 7-glucoside. -
Heterocyclo-sulpha drugs: part x. Novel 5-imino-a2-pyrazolin-4-ditfflocarbamyl-s-azo dyes as antimicrobial agents
( Qatar University , 1994 , Article)Synthesis of a series of novel azo-sulpha drugs as 5-imino-3-methyl-l-phenyl-A -pyrazolin-4-dithiocarbamyl-s-azo dyes (I-XV) are described by the reaction of 4-sulphamoyl and/or sulphonyl diazonium chloride with ... -
Liquid chromatographic separation of the enantiomers of racemic A aminophosphonates as their n-3, 5-dinitrobenzoyl derivatives On chiral fluorocarbinol stationary phases
( Qatar University , 1994 , Article)The enantiomers of a wide variety of a-aminoaryl (or alkyl) phosphonate esters are separated by liquid chromatography as their N-3,5-dinitrobenzoyl derivatives on three chiral fluorocarbinol stationary phases. In addition ... -
Studies for determining antimicrobial activity of solenostemma argel (del) hayne. 1-extraction with methanol/water in different proportions
( Qatar University , 1994 , Article)Aerial parts of Solenostemma argel plant were successively extracted with methanol/water in different proportions (4 fractions). The phytochemical and chromatographic screening as well as quantitative determination of the ... -
Studies for determining antimicrobial activity of solenostemma argel (del) hayne. 2-extraction with chloroform/methanol in different proportions
( Qatar University , 1994 , Article)Aerial parts of Solenostemma argel plant were successively extracted with chloroform/methanol in different proportions (4 fractions). The phytochemical and chromatographic screening as well as quantitative determination ... -
Synthesis Of Some Glycyrrhetic Acid Sulfonamide Derivatives With Prospected Antimicrobial Activity
( Qatar University , 1994 , Article)Some glycyrrhetic acid sulfonamide derivatives (I-VIII) were prepared. Apart from their chemical structures which were confirmed by elemental analysis, IR, 'H and ^C-NMR, their behaviour under electron impact was also ... -
Synthesis of some new oximes, thiocarbamates, pyrazolyloxy, isoxazolyloxy, Pyrmidyloxy and pyridyloxy quinolines
( Qatar University , 1994 , Article)The reaction of 1 or its corresponding chalcones 3a-c with hydroxylamine in boiling pyridine gave the oximes 2 or 5a-c respectively in almost quantitative yield. When both 2 and 5a-c were reacted with phenylisothiocyanate, ... -
Synthesis of some newer indazolyl-oxadiazoles, thiadiazoles and 1,2,4-Triazoles
( Qatar University , 1994 , Article)2-Aryl-3-chloro-2H-indazole (4), obtained in excellent yield (>90%) by the action of thionyl chloride on o-azidobenzanilide(3), was allowed to condense with ethyl p-aminobenzoate to afford the corresponding indazolo-ester ...
