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Polarographic Investigation Op B-N-Oxalyl-L-A,B-Diaminofr.Ofrionic Acid, A Neurotoxin Prom The Seeds Op Lathyrus Sativus(Guaya)

Yohannes, Teketel (Addis Ababa Universty, 1969-06)

Polarographic investigations of £-N-Oxalyl-L-a > 0-Diaminopropionic acid, ODAP, a neurotoxin from the seeds of Lathyrus sativus(Guaya) have been made. Aqueous solutions of ODAP in KC1 supporting electrolyte gave a ...

A Dissertation Presented to the Faculty of the Graduate School of Arts and Sciences of Braitdeis University, Waltham , Massachusetts

Biftu, Tesfaye (Addis Ababa Universty, 1978-08)

2,3- Diaroylbutanes were selectively converted with high stereospecificity to 2,5~diaryl“3,4-dimethylfurans or 2,3- diarylbutanes. The racemic forms of the dibenzylbutane lignans, dihydroguaiaretic acid dimethyl ether ...

Analyses of the Essential Oils of Artemisl Rehan and Cymbopogon Citratus

G.Yohannes, Paulos (Addis Ababa Universty, 1980-06)

Artemisia rehan Chiov and Cyifopogon citratus (DC) Stapf are widely grown in thelighlands of Ethiopia. These plants occupy a significant|sition in Ethiopian I plantlore. | The oil of Artemisia rehan, anendemic plant ...

The Reaction Op Brcmoacetil Bromide with Selected Orgahometallic Compounds

Tafesbe, Fikru (Addis Ababa Universty, 1980-06)

Organometallic compounds are widely used as heterogenous and homogenous catalysts in the industrial productions of important chemicals and synthetic products. In many cases of such industrial transformation, metal carbenes ...

Synthesis of Selenite and Tellurite Pased Cation Exchangers and their Selected Applications

Sisay , Tezera (Addis Ababa Universty, 1980-06)

The synthesis of zirconium selenite and thorium tellurite are reported. Zirconium selenite has been prepared by mixing 4 N HCl solution of zirconium oxychloride with 4 N HCl solution of sodium selenite, and by adjusting ...

Electro-organic Synthesis of Some Natural Products Analogues

Tecle, Berhane (Addis Ababa Universty, 1980-07)

In this project an attempt was made to prepare lignans by oxidative and reductive coupling of the a-enolates and a-bromo derivatives of substituted propiophenones respectively. Propiophenone derivatives were prepared ...

Development of Detergent Sensitive Electrodes and Studies of the Charge Transfer Reaction at These Electrodes

Alomayehu, Beniam (Addis Ababa Universty, 1981-06)

Chemical Composition of Croton Macrostachys

Henberu, Dirshaye (Addis Ababa Universty, 1981-06)

The root~·bark powder of Croton macrostachys Hochstex. A. Rich. (Euphorbeaceae) (ብሳና), used in Ethiopia for curing spreading wounds, was extracted with diethyl ether. The crude extract, on fractionation by column ...

Photochemical Remote Oxination of Oleyl Ester of P-Benl:Joylbenzoic Acid

Gerba, Semlaba (Addis Ababa Universty, 1981-07)

Oleyl ester of p-benzoylbenzoic acid (I) was irradiated in carbontetrachloride. The triplet state of benzophenone served to abstract hydrogen; intramolecular to, but structurally remote from the excited carbonyl

The Chemical Composition and Antimicrobial Activlty of Impatiens Tinctffiia A. Rich

Fassil, Yohannes (Addis Ababa Universty, 1981-07)

The plant Impatiens tinctoria A-Rich grows widely in Ethiopia. its tubers are traditionall;y used to dye the palms of nails of women and to treat infections of the hands and feet. The methanol extract of I. tinctoria ...

Photofading and Photodecomposition Studies of Some Ind igold dyes

Tefera, Solomon (Addis Ababa Universty, 1982-06)

T h e l i g h t f a s t n e s s o f f i v e i n d i g o i d d y e s i n b e n z e n e i s e x a m i n e d . O f t h e f i v e d y e s ; i n d i g o s h o w e d t h e l e a s t r e s i s - t a n c e t o f a d i n g a n d ...

The Synthesis, Characterization and Investigation of the Catalytic Activties of Some L O 5-Cyclooctadiene and 2,5•-Norbornadiene Group Vib Transition Metal C,1rbene Carbonyl Complexes

Hirpo, Waakgari (Addis Ababa Universty, 1982-06)

The reaction of l,5-cyclooctadiene tetracarbonyl tungsten (0) with methyllithium gave products in which the diene is no more coordinated to the metal. It was investigated that the compound is catalytically active and ...

Attempts Towards the Synthesis of Substituted Pyrrolines

Mammo, Wendimagegn (Addis Ababa Universty, 1982-06)

In this project, the reactions of several functionalized compounds possessing the nicotine skeleton have been investigated. Studies also have been conducted on the cycloaddition reactions of C-pyridyl-h-methylnitrone with ...

Synthesis of Hetecrocyclic Compounds Starting from 3-Amino and 3-Hydroxythioacrylamides

Areda, Alemayehu (Addis Ababa Universty, 1982-06)

The 3-amino- and 3-hydroxythioacrylamides were obtained by deprotonation and hydrolysis of l-mercaptotrimethinium perchlorates respectively. In this researeh, both the thioacrylamides and the mercapto salts were used ...

Chemical Composition of Rumex abyssinicus

Bezabih, Alemu (Addis Ababa Universty, 1982-06)

Rumex abyssinicus, family polygonaceae is a plant used traditionally for colouring textiles and food. It has several medicinal application such as purgative, antidiabetic, and taencide. l'he powdered root of R0abyssinicus was ...

Attempts towards the synthesis of Kosotoxin and Analogues

Alemayehu, Gizachew (Addis Ababa Universty, 1982-06)

As part of our attempts to synthesize Kosotoxin (1) simple synthetic procedures for the synthesis of related compounds !, ~,. 52,· shown below have been developed. Furthermore D and F which are key intermediates for the ...

Solvent Extractioh and Spectrophotometric Determination of Cobalt( III) and Iron( III) with N-Hydroxy-N ,N '-Diphenylbenzaihdine in Presence of Azide.

Moges, Ghirma (Addis Ababa Universty, 1982-06)

N-'Hydroxy-N ,N' -diphenylbenzamidine (HDPBA)" a bidentate chelating agent, reacts with cobalt(III) and ironeIII) in the p,resence of azide to give a pinkish red and red-violet coloured mixed ligand complexes, which ...

Determination of Total Gossypolin Cottonseeds and Cottonseed Press Cakes

Admasu, Atnafseged (Addis Ababa Universty, 1982-07)

The reaction of gossypol vuth 3~anuno-l~propauol and iron (III) in acidic medium produces a green colored complex soluble in isopropyl alcohol-fcexa.no mixture (3:2), having a characteristic absorption maximum at 6"o ...

N-Phenylcinnamohydroxamio Acid as an Analytical Rlagent for Solvent Extraction And Spectrometric Determination Of Vanadium (V)

Assefa, Mulugeta (Addis Ababa Universty, 1983-06)

N-phenylcinnamohydroxamic acid (PORA) has been found to form a convenient extraction system for uRnadium (V) in presence of p-chlorophenol and also in SON media. PORA reacts with vanadium (V) to give a 1:2 complex ...

Polarography of the Complexes of Cd(II), Co(II), and Ni(II) with Threomine

Demoz, Alebachew (Addis Ababa Universty, 1983-06)

The po1'lro[;rl'<phic lWhllviour of tho COl1pl exco of throonine Ilith c<!(n) , Go(H), mill Nl(II) hllVo boon otuuiod in hero-to buf for lit ~50G . '1'110 lXJ polnrogl'tlphic ro(luction of tho Cd(II);hrconine OyotOll ...

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