http://localhost:80/xmlui/handle/123456789/17412 2026-04-15T11:04:57Z 2026-04-15T11:04:57Z M.S. KHAN ABDUL HANAN ABDUL MAJEED http://localhost:80/xmlui/handle/123456789/20000 2023-12-05T04:26:14Z 1988-09-03T00:00:00Z

Title: Reduction of Aromatic Nitro Compounds Using Aluminium Scrap Authors: M.S. KHAN; ABDUL HANAN; ABDUL MAJEED Abstract: 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 aluminium which is a cheaper metal than zinc, tin and magnesium has not been considered for this type of reduction. Only two references are cited in literature where aromatic nitro compounds have been reduced with aluminium in presence of dil H2SO4 to yield aminophenols [1,2]. In the present work reduction of same aromatic compounds with Al/conc.HC1 to obtain respective aniline is reported. Thus a cheaper reagent for the reduction of aromatic nitro compounds is introduced. Aluminium scrap has been used for the reduction and experiments were repeated by using aluminium powder (A.R. grade) for comparison of yields. The various anilines obtained were further characterized by preparing their derivatives (Table-II). The yields obtained with pure Al powder are about 5% higher than those obtained with Aluminium scrap. That may be due to the oxide layer on it which could not be fully removed. Nevertheless the yields obtained are high and compare favourably with those obtained by using magnesium, zinc or tin.

1988-09-03T00:00:00Z M.RASUL JAN Haroon-ul-Rashid http://localhost:80/xmlui/handle/123456789/19209 2023-03-14T06:41:48Z 1988-09-20T00:00:00Z

Title: Synthesis and Characterization of new Hydroxybridged Chromium (Ill) Complexes with L—Aspartic acid and L—Serine Authors: M.RASUL JAN; Haroon-ul-Rashid Abstract: 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 established by the use of the solid state U.V-Visib1e studies. Low tanperature magnetic moment studies of these compounds confirm hydroxy bridging. In addition to hydroxybridged corrpounds, the tris aspartic and tris serine cmpounds were also prepared. The tris serine compound is anhydrous in contrast to the tris aspartic acid compound. The compound [Cr( Serine)N0 OH] was also prepared.

1988-09-20T00:00:00Z JAMIL ANWAR ANJUM IMTIAZ SUMRA JAN NAGRA, SAEED AHMAD http://localhost:80/xmlui/handle/123456789/19205 2023-03-14T06:41:27Z 1988-09-20T00:00:00Z

Title: An Indirect Spectrophotometric Method for the Microdetermination of Nitrogen (as ammonia) Authors: JAMIL ANWAR; ANJUM IMTIAZ; SUMRA JAN; NAGRA, SAEED AHMAD Abstract: 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 incomplete. After filtering off the precipitate, the filtrate contains unreacted nickel and dimethyl glyoximate ions. Addition of armonia to this filtrate produces an equivalent quantity of nickel-dimethyl glyoximate which is extracted into chloroform and the absorbance of the extract is measured.

1988-09-20T00:00:00Z INAM UL HAQUE http://localhost:80/xmlui/handle/123456789/19201 2023-03-14T06:41:07Z 1988-09-20T00:00:00Z

Title: Analysis of Volatile Constituents of Pakistani Coleus aromaticus Plant Oil by Capillary Gas Chromatography IMass Spectrometry Authors: INAM UL HAQUE Abstract: 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

1988-09-20T00:00:00Z