摘要:

AbstractA number of Ni(II) complexes ofN,N′‐bis(8‐quinolyl)trimethylenediamines are synthesized both as perchlorate salts and neutral amino complexes. Substitutions on the 2 and 6 positions of the quinolyl ligands are introduced for various reasons concerning the structural studies. The structural informations are obtained by studies of the magnetic properties, electronic spectra and NMR spectra. Structural changes effected by acid/base property of the medium are followed by NMR spectro

ISSN:0009-4536    

DOI:10.1002/jccs.198100001

出版商:WILEY‐VCH Verlag    

年代:1981

数据来源: WILEY

摘要:

AbstractA differential pulse polarographic method for determination of oxygen to uranium ratio in uranium oxides is fully described. An accuracy −2.62% to +4.35% was achieved by calibrating the method against standard U3O3, replicate test runs with UO2, gave a precision of ±4.59% or better. The method is now successfully used in routine analysis for UO2fu

ISSN:0009-4536    

DOI:10.1002/jccs.198100002

出版商:WILEY‐VCH Verlag    

年代:1981

数据来源: WILEY

摘要:

AbstractCopper ion selective electrode was constructed and the performance of membranes prepared from different methods was compared. Removal of oxygen from the system in the preparation of electrode membrane was suggested. The behavior of the membrane, the working concentration range, response time, internal filling solution and treatment of the electrode were discussed.

ISSN:0009-4536    

DOI:10.1002/jccs.198100003

出版商:WILEY‐VCH Verlag    

年代:1981

数据来源: WILEY

摘要:

AbstractThe chromic acid oxidation of propionaldehyde in the presence of picoIinic acid proceeds much faster than that of propionaldehyde alone. It is shown that picolinic acid is an effective catalyst. The rate law governing this catalysis is rate=k[HCrO4−][PA]‐[CH3CH2CHO][H+]2/(a+b[H+]+c[H+]2). A mechanism consistent with the rate law was proposed: picolinic acid reacts with chromic acid to form a cyclic intermediate complex C1, C1further reacts with a molecule of hydrated aldehyde to give a termolecular complex C2and a hydrogen ion, C2then undergoes oxidative decomposition in the next step to give produ

ISSN:0009-4536    

DOI:10.1002/jccs.198100004

出版商:WILEY‐VCH Verlag    

年代:1981

数据来源: WILEY

摘要:

AbstractThe Grignard reagent derived fromp‐bromobenzyltetrahydropyranyl ether on reaction with the des‐A, B‐cholestan‐8‐one yielded 8‐p‐(terahydropyran‐2′‐yloxymethyl)‐phenyl‐des‐A, B‐cholestan‐8‐ol which on treatment with H2SO4to give 8‐p‐(hydroxymethyl)‐p

ISSN:0009-4536    

DOI:10.1002/jccs.198100005

出版商:WILEY‐VCH Verlag    

年代:1981

数据来源: WILEY

摘要:

AbstractThe presence of small amounts of ceric and bromide ions in the aqueous sulfuric acid solution of maleic acid can catalyze the isomerization of maleic acid to fumaric acid rapidly and quantitatively at room temperature. A qualitative kinetic study was carried out to see how the rate and the yield of this reaction depend on the relative amounts of maleic acid, ceric ion, and bromide ion. In general, the rate increases asymptotically to a limiting value as the concentration of maleic acid, ceric or bromide ion increases. Sulfuric acid has both the chemical and physical effects on the rate of isomerization. If the relative amounts of the reactants is in the order of [maleic acid]≥[Br−]≥[Ce(IV)], a very high yield up to 98% can easily be obtained. Sulfuric acid does not have major effect on the yield. A mechanism was proposed to rationalize the experimental re

ISSN:0009-4536    

DOI:10.1002/jccs.198100006

出版商:WILEY‐VCH Verlag    

年代:1981

数据来源: WILEY

摘要:

Abstract13C FT NMR method of gated decoupling without NOE was applied in the quantitative analysis of aspirin, ethenzamide and caffeine mixture (antipyretic). Spectra were obtained in pyridine‐d5, containing anisole as an internal standard and chromium(III) acetylacetonate as a paramagnetic relaxation reagent, The results were generally satisfactor

ISSN:0009-4536    

DOI:10.1002/jccs.198100007

出版商:WILEY‐VCH Verlag    

年代:1981

数据来源: WILEY

摘要:

AbstractThe results ofpH‐metric titration have been used to determine the acid dissociation constants of 2‐carboxy‐pheylhydrazo‐ethylacetoacetate abbrivated (2‐CPHEA) and the overall stability constant (log β=KML, KML2) of twelve rare earth element complexes in 75% dioxan were

ISSN:0009-4536    

DOI:10.1002/jccs.198100008

出版商:WILEY‐VCH Verlag    

年代:1981

数据来源: WILEY

摘要:

AbstractIsonicotinic acid hydrazide (INH) and their derivatives are generally used as antitubercular agent. We synthesised 1‐isonicotinoyl‐3‐methyl‐4‐(substituted azo) pyrazol‐5‐one and their derivatives. TheirRfvalues, chemical analyses and IR spectra were recorded, The compounds had shown significant central nervous system stimu

ISSN:0009-4536    

DOI:10.1002/jccs.198100009

出版商:WILEY‐VCH Verlag    

年代:1981

数据来源: WILEY

摘要:

AbstractA gas Chromatographic method has been established for analysis of Cinoxacin in crystalline powder. The method is based on chemicaI derivatization of Cinoxacin as its methyl ester, andn‐octacosane is used as an internal standard. Gas chromatographic analysis was proceeded on a glass column packed with 2% OV‐1 on Chromosorb W. Quantitation is feasible by measurements of peak area ratios. The method proves to be simple, rapid and accur

ISSN:0009-4536    

DOI:10.1002/jccs.198100010

出版商:WILEY‐VCH Verlag    

年代:1981

数据来源: WILEY