摘要:

AbstractThe oxidation potential of the Ce(III)‐Ce(IV) couple in sulfuric acid over the concentration range of 0.05 to 0.5Fwas observed at 25°C by using the Pt‐PbO2/PbSO4, SO4= electrode as the reference electrode. The free energy change for the reaction 2Ce+3+ PbO2+ 4H++ SO4= 2Ce+4+PbSO4+2H2O was estim

ISSN:0009-4536    

DOI:10.1002/jccs.196100017

出版商:WILEY‐VCH Verlag    

年代:1961

数据来源: WILEY

摘要:

AbstractUltra‐violet absorption spectra of aniline, β‐naphthylamine and β‐naphthol were studied qualitatively, by taking advantage of the effects due to the presence of a proton‐acceptor reagent,p‐dioxane, in various solvents with different dielectri

ISSN:0009-4536    

DOI:10.1002/jccs.196100018

出版商:WILEY‐VCH Verlag    

年代:1961

数据来源: WILEY

摘要:

AbstractRefractive indices of a series of binary solutions: water‐p‐dioxane,p‐dioxan‐ethyl alcohol, ethyl alcohol‐chloroform,p‐dioxane‐cyclohexane and cyclohexane‐aniline, were measured to determine polarisability of the related organic liquids with the use of Böttcher's formula for refraction of mixture, on the basis of water data obtained by the liquid‐

ISSN:0009-4536    

DOI:10.1002/jccs.196100019

出版商:WILEY‐VCH Verlag    

年代:1961

数据来源: WILEY

摘要:

AbstractTwo methods using gallein as indicator for the direct titration of lead with disodium salt of EDTA have been developed. In one method, the titration of lead was effected in a weakly acidic medium, using pyridine or hexamethylene‐tetramine as buffer. The optimumpH for the titration was found to be atpH 5.5 to 6.0.Gallein indicator undergoes color change from purplish blue to red. In proceeding the titration within thepH range mentioned above, and in the presence of equimolar concentration of magnesium and alkaline earth metals as well as monovalent cations, no interference was observed.In the other method, the titration of lead was carried out in the presence of Rochelle salt, using ammonia and ammonium chloride buffer to keep the solution atPH 10. Sharp color change from violet to deep magenta red was observed at the end point. Only univalent cations, such as sodium, potassium, lithium, ammonium or silver did not show interference with the titration. The use of some masking agents has also been demonstrate

ISSN:0009-4536    

DOI:10.1002/jccs.196100020

出版商:WILEY‐VCH Verlag    

年代:1961

数据来源: WILEY

摘要:

AbstractBromotropolone derivatives, when heated with acetic anhydride and acetyl chloride, afforded acetylated chlorotropolone derivatives. Similarly, the reaction between bromotropolone derivatives and hydriodic acid gave the corresponding iodotropolone derivatives. The reactivity of various bromotropolone derivatives in view of the replacement of bromine atoms by chlorine or iodine atoms was extensively investigated.

ISSN:0009-4536    

DOI:10.1002/jccs.196100021

出版商:WILEY‐VCH Verlag    

年代:1961

数据来源: WILEY

摘要:

AbstractEvolution of hydrogen chloirde occurs when an organic acid which tends to undergo intramolecular dehydration at elevated temperatures is heated with dried sodium chloride at 150°. Aliphatic and aromatic monocarboxylic acids are not acted upon under the same conditions. However, when mono‐ or polycarboxylic acids having a pKa<5.3, are heated with solid calcium chloride dihydrate, the above reaction takes place much more rapidly with the evolution of hydrogen chloride. Calcium chloride is also found to induce elctrophilic aromatic iodination without the presence of any oxidizing age

ISSN:0009-4536    

DOI:10.1002/jccs.196100022

出版商:WILEY‐VCH Verlag    

年代:1961

数据来源: WILEY

摘要:

AbstractCoumarilic acid and its functional derivatives, including sixteen compounds hitherto unknown, have been prepared for antimicrobial evaluation. A preliminary antifungal test indicated that some of the derivatives were highly active. The details on their antibacterial as well as antifungal properties will be reported later.

ISSN:0009-4536    

DOI:10.1002/jccs.196100023

出版商:WILEY‐VCH Verlag    

年代:1961

数据来源: WILEY

摘要:

AbstractAqueous solution of soluble silanolates from rice hull, kept at varyingpH values, were deionized. Solid insoluble polymerization products were invariably obtained. Attempts were made to inhibit the polymerization and to enable the isolation of lower polymers by the use of trimethychlorosilane. But the results indicated that polymerization had taken place to a great extent before the latter reagent could convert the silanolates to non‐polymerizable product

ISSN:0009-4536    

DOI:10.1002/jccs.196100024

出版商:WILEY‐VCH Verlag    

年代:1961

数据来源: WILEY

摘要:

AbstractSix new methylsilyl derivatives were prepared from geraniol, citronellol, and menthol.

ISSN:0009-4536    

DOI:10.1002/jccs.196100025

出版商:WILEY‐VCH Verlag    

年代:1961

数据来源: WILEY

摘要:

AbstractPaper chromatography using the polyamide impregnated paper were reviewed. The method for preparing plates coated with a thin‐layer of polyamide for chromatographical work was devised. Circular polyamide plates for horizontal chromatography was also prepared. These plates were applied to the chromatography of the phenols, phenolic carboxylic acids and tropolones. The reproducibility of the chromatogram were excellent. It was found that polyamide thin‐layer chromatography is the most convenient method for the separation of phenolic substances ever found. TheRfvalues of phenols, phenolic carboxylic acids and tropolones are tabulated and the relations between solvents,Rfvalues and structure of phenols are discus

ISSN:0009-4536    

DOI:10.1002/jccs.196100026

出版商:WILEY‐VCH Verlag    

年代:1961

数据来源: WILEY