Issue 03

 

Recent Submissions

  • Reduction of Aromatic Nitro Compounds Using Aluminium Scrap 
    M.S. KHAN; ABDUL HANAN; ABDUL MAJEED (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 1988-09-03)
    Reduction of aromatic nitro compounds with metals and concentrat¬ed acids have most commonly been carried out using iron, tin, zinc and magnesium metals. The acids used are H2SO4' HC1 and acetic acid. Astonishingly enough ...
  • Synthesis and Characterization of new Hydroxybridged Chromium (Ill) Complexes with L—Aspartic acid and L—Serine 
    M.RASUL JAN; Haroon-ul-Rashid (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 1988-09-20)
    A new series of Chromium(lll ) hydroxybridged convounds of general formula [Cr(L) (OH) ] x H O have been synthesised. The infrared spectra have been systematical ly exami ned. The existence of cis and trans isonprs was ...
  • An Indirect Spectrophotometric Method for the Microdetermination of Nitrogen (as ammonia) 
    JAMIL ANWAR; ANJUM IMTIAZ; SUMRA JAN; NAGRA, SAEED AHMAD (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 1988-09-20)
    A simple indirect spectrophotometric method for the determination of nitrogen (as ammonia) is described. The method is based on the fact that in a neutral medium the precipi tat ion of nickel with dimethylglyoxime remains ...
  • Analysis of Volatile Constituents of Pakistani Coleus aromaticus Plant Oil by Capillary Gas Chromatography IMass Spectrometry 
    INAM UL HAQUE (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 1988-09-20)
    Thymol 79.6%, has been shown to be the princi pal compound among fi f teen components detected in the essential oil of the Coleus aromaticus
  • Gas Chromatographic Separation of Copper(ll), Nickel(ll) and Palladium(ll) Complexes of Meso-and DL—Bis (Isopropanoylacetone) Stilbenediimine 
    M. Y. KHUHAWAR; A.K. Talpur (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 1988-09-20)
    Copper( l l) , nickel (Il) and pal ladium(ll) complexes of bis( isopropa- PA S) and nickel (Il) and palladium(ll) PA S) are prepared for their possible use for gas chromatographic separation of copper, nickel ånd pal ladium. ...
  • Kinetics of the Thermal Gas—phase Decomposition of 2—Ethoxypropene 
    IFTIKHAR A. AWAN; M.C.Flowers (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 1988-09-20)
    Ki netics of the gas phase deconposition of 2-ethoxypropene has been studied over the temperature range 544-635 K at a pressure between 3 and 72 torr. Ethene and propanone, fomed in equimolar amunt ( ± 4 Z), were the major ...
  • Syntheses of Some N—Alkylated—2-Substituted Imidazoles 
    MUHAMMAD MOAZZAM; J. PARRICK (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 1988-09-20)
    Substituted imidazole were prepared by modi fi cation of known methods. Some substitutions, e.g. acetyl at ion, at the 2-position of these convounds were also carried out. A few hydrazones of I-triphenylmethyl imi ...
  • Spectrophotometric Determination of Sulphide by Liberation of Thiocyanate from Mercury (Il) thiocynate . 
    JAMIL ANWAR; AMTUL AZIZ (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 1988-09-20)
    A simple indi rect spectrophotometric determination of sulphide is descri bed. The method is based upon the displacement of thiocyanate ions from mercury (Il ) thiocyanate by sulphide ions. The released thiocyanate ions ...
  • Synthesis of Symmetrical Azo Dyes from 4,4'-Diamino— Diphenylamine-2—Sulphonic Acid 
    M.A.Saeed; Badruddin; M.Farooq; M.Younas; Fauzia Shafi (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 1988-09-20)
    Synthesis of some bis-azo dyes based on 4,4'-diamino-dipheny1amine2-sulphonic acid has been described. The properties of these dyes have been compared with similar dyes derived from benzidine. Since benzidine is one of the ...
  • Syntheses and Characterization of Some 2—Trihalogeno— Methyl-s-Triazolo [1, 5-a] Pyridine 
    Muhammad Moazzam; J.Parrick (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 1988-09-20)
    Some novel 2-trihalogenomethyl of potential interest as radiosensitizer have been prepared from. 2-hydrazino-3nitropyridine in condensation with tri fluoroacetic anhydride, trichloroacetic and tribromoacetic acids ...
  • Some Reactions of Enamines 
    Kandile, Nadia G.; Tahia M.; Abdel Latif (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 1988-09-20)
    Tetrabromo-2-benzoquinone reacts with cyclopentenyl ) piperidine and 1-(1-cyclohexenyl ) piperidine to give the open (1:1) adduct (la,b) or (I'a,b), whereas it reacts with I-cyclopentenyl ) morpholine to give the open (1:1) ...
  • The Newtonian Viscosity of Polymer Solutions: Over a Wide Range of Concentrations 
    BALOCH, MUSA KALEEM (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 1988-09-20)
    Viscos i ty of three pol ymers, namely polyi sobutyl ene, cel lulose acetate and polyschizophyl Ian, having different degree of flexibility is investigated over a wide range of concentrations and weights. The data so ...
  • Synthesis and Reactions of 4, 6—Diaryl— 2,3,4,5-Tetrahydropyridazin-3-ones 
    M.A.Sayed; A.A.El-Khamry; A.Y.Soliman; A.A.Afify; E.A.Kassab (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 1988-09-20)
    The hitherto unknown 4,6-diaryl -2,3,4,5-tetrahydro-pyridazi n-3-ones (Il)a-e were synthesised from the a-aryl , B-aroylpropionic acids (I)a-e either by their reaction with hydrazine hydrate or by their conversion to ...
  • Nitration of Hector's Base 
    BUTLER, ANTHONY R.; HUSSAIN, ISHTIAQ (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 1988-09-20)
    Ni tration of Hector's Base gives both mno and dinitro products. in each case, only one out of two phenyl rings involves in the nitration process and that ring is the 3-anilino portion of the kkctor's Base. The protonation ...
  • Thermodynamics of Molecular Association of Alcohols and Ketones 
    Hegazi, Wafaa S; Taha, Ahmed A.; Emara, Aziza A. (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 1988-09-20)
    Studies on the molecular association of some alcohols and ketones, separately, and with each other were performed in the two different solvents diphenyl methane and tetradecane. The investigations were carried out at 25, ...
  • Spectroscopic Studies of Lignins from Wheat Straw and Kai Grass 
    MANSOOR AHMAD; LAL KHAN (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 1988-09-20)
    :Lignins were isolated from wheat straw and kai grass. Their IR, UV Il-I-NMR and Mass spectra were recorded to classify these compounds . The spectroscopic results indicate that these lignins are composed of guaiacyl-syringly ...
  • Stability of Metal Chelates of 2—Su1phonic-4-Methyl Phenylhydrazono Diethylmalonate in Various mixed Aqueous Solvents 
    F.I.ZIDAN; B.A .EL-SHETARY; A . SALMAN; N.EL-KHOLY (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 1988-09-20)
    Ph-meteric studies have been carried out to determine the dissociation constant of 2-Sulphonic-4-rrethy1 phenyl -hydrazono di-ethylmlonate abb-reviated (2-SPHDEM) ligand, as wel l as, the stability constants of its complexes ...
  • Polarographic Behaviour of Some Sulphonic—aryl—hydrazono Dyes Pyrazolin-5-one Dyes 
    BASHEIR A. EL-SHETARY; MOHAMED S; ABDEL-MOEZ; FAROUK I. ZIDAN; SHAKER L. STEVAN (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 1988-09-20)
    Polarographic studies of some sulphonic aryl (or napthol ) hydrazono -I-phenyl -3-methyl -2-pyraz01in-5-one have been carried out in ethyl alcohol B. R. buffer solutions in the pH range 1.8 - 12.0. The nurrber of reduction ...