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Browsing Volume 10 by Title

Browsing Volume 10 by Title

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  • 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 ...
  • 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 ...
  • Large Amplitude Pulse Voltammetry of Aromatic Amino Compounds 
    INAM UL HAQUE (The Chemical Society of Pakistan, 1988-12-12)
    Large amplitude pulse voltammetry of aniline, p-anisidine, p-phenetidine, p-chloroaniline and m- dimethylaminoanisidine in nearly neutral aqueous solution at low concentrations shows that the anodic oxidation of these ...
  • 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 ...
  • 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 ...
  • On the Formation of Mn(II) Anthranilic Acid Anilide Complexes. Structural Elucidation by TGA, IR, Electronic, EPR Spectra and Potentiometric Studies 
    SAMY; M.ABU-EL-WAFA; MOSTAFA A.EL-BEHAIRY; RAAFAT M. ISSA; AKILA A. SALEH (The Chemical Society of Pakistan, 1988-12-15)
    A new series of Mn(1I)-anilide complexes have been prepared and chara¬cterized by elemental analysis, TGA and IR spectra. Electronic and EPR spectra indicate octahedral geometry around the MN(II) ion, where the solvent ...
  • Phase Transfer Synthesis of Sulphamethoxazole 1 N (methyl 2,3,4-tri-O-acety1-13-D-glucuronide) 
    BASHIR AHMAD; J.W.POWELL (The Chemical Society of Pakistan, 1988-12-09)
    Sulphamethoxyazole-N1 -(methyl 2,3,4-tri-O-acetyl-6-D-glucuronide) was successfully synthesized and characterized by NMR and mass spectrometry for the metabolic study of suiphamethoxazole.
  • 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 ...
  • Reaction of 3-Ben zylidenephthalide with Diamines and p-Aminophenylcarboxylic Acids & Antimicrobial Activities of the Products 
    A.H.BEDAIR; R.Q.LAMPHON; S.A.GHAZAL (The Chemical Society of Pakistan, 1988-12-02)
    Bis-(2-methylene-3-benzalphthalimidine) II, desoxybenzoin-o-(4'- aminophenyl) carboxamide III and 2- (substitutedpheny1)-3-benzalphthalimidines of type IV and V were obtained via interaction of corresponding diamines with ...
  • 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 ...
  • Review: Glycoproteins: Biologically Vital Macromolecules 
    NASIR-UD-DIN; EVELYNE WALKER-NASIR; M.A.K.MALGHANI; S.ALTAF HUSSAIN (The Chemical Society of Pakistan, 1988-12-17)
  • Sesquiterpenoids of Ferula Species 
    HASSAN M.G.AL-HAZIMI (The Chemical Society of Pakistan, 1988-12-18)
  • Some New Tin(II) Complexes of Schiff Bases Derived from Sulphadrugs 
    A.K. VARSHNEY; J.P. TANDON (The Chemical Society of Pakistan, 1988-12-14)
    Reactions of tin(II) methoxide with the Schiff bases derived by the condensation of salicyladehyde and sulfadrugs have resulted in the isolation of some new tin(II) derivatives. These have been characterized on the bases ...
  • 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) ...
  • 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 ...
  • 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 ...
  • Studies on the Condensation of 1,3-Diaryl-propen-1-one with Ethyl Cyanoacetate 
    S.EL-NAGDY; F.A.EL-BASSIOUNY; I. ATTIA; M.R. MAHMOUD (The Chemical Society of Pakistan, 1988-12-08)
    Michael condensation of 1[p-bromopheny1]-34p-chlorophenyli-propen¬1-one [I] with ethyl cyanoacetate in the presence of ammonium acetate leads to the formation of (II) 6[p-bromopheny1]-2-hydroxy-44p-chlorophenyll nico¬tinonitrile, ...
  • 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 ...
  • 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 ...

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