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 ...
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 ...
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 ...
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. ...
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 ...
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 ...
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 ...
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 ...
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 ...
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) ...
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 ...
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 ...
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 ...
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, ...
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 ...
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 ...
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 ...