摘要:

AbstractIntermolecular association in the binary mixtures ofp‐dioxane with chloroform and with aniline is discussed in terms of polarisability on the basis of Böttcher's formula for the molecular refraction of mixtur

ISSN:0009-4536    

DOI:10.1002/jccs.196100030

出版商:WILEY‐VCH Verlag    

年代:1961

数据来源: WILEY

摘要:

AbstractCadmium EDTA complexes in the acetate buffer has been used as an indicator electrolyte in the determination of zirconium and hafnium as EDTA complexes atpH 4.2. The polarographic determination of zirconium and hafnium could be made with solutions of concentrations as low as 10−6molar or 0.1p.p.m. The results were compared with those obtained by potentiometric titration of the free cadmium ion in the concentration range 10−3to 10−4molar using cadmium amalgam as an indicator elec

ISSN:0009-4536    

DOI:10.1002/jccs.196100031

出版商:WILEY‐VCH Verlag    

年代:1961

数据来源: WILEY

摘要:

AbstractGallein was polarographically studied in 40% ethanol solutions containing sodium carbonate or poassium biphthalate buffers at varyingpH's. A well‐defined polarographic wave with E1/2ranging from −0.50 to −0.70 volt(S. C. E.)was observed in thepH. region 2∼ 6.6 while two waves with E1/2at −1.2 and −1.5 volts(S. C. E.)were observed in the pH region of 8.3 to 10.2 at 25°C.The former corresponds to a one‐electron reversible reaction while the latter ones may be irreversible.Gallein was polarographically determined in 40% ethanol solution over the concentration range of 3×10

ISSN:0009-4536    

DOI:10.1002/jccs.196100032

出版商:WILEY‐VCH Verlag    

年代:1961

数据来源: WILEY

摘要:

AbstractA new method for the simultaneous volumetric determination of bismuth and lead in the same solution with the disodium salt of ethylenediaminetetraacetic acid was proposed. By the selective control of thepH to about 1.5, the author found it possible to titrate bismuth alone, and that lead could be subsequently titrated atpH 6.0 by adding pyridine as a buffer. Gallein was exclusively employed as indicator in the titration. It underwent an end point color change from magenta to pale yellow in the titration of bismuth, and from purplish blue to red in the titration of lead.

ISSN:0009-4536    

DOI:10.1002/jccs.196100033

出版商:WILEY‐VCH Verlag    

年代:1961

数据来源: WILEY

摘要:

AbstractGermanium was polarographically determined in NH4OH‐NH4Cl buffer ofpH 9.2 on the one hand, and in 40% ethanol solutions containing the same buffer and an excess of gallein on the other hand. The optimum concentration range for the determination of germanium was 2×10−6to 5×10−4molar in the former case, and 5×10−5to 1×10−3molar in th

ISSN:0009-4536    

DOI:10.1002/jccs.196100034

出版商:WILEY‐VCH Verlag    

年代:1961

数据来源: WILEY

摘要:

AbstractThe systematic study on the extraction behavior of uranyl thiocyanate with a mixture of isoamyl alcohol and ethyl acetate is described.A uranium solution containing 1Mto 3Mof thiocyanate atpH range 1.0 to 3.0 was extracted quantitatively with a mixture of isoamyl alcohol and ethyl acetate (1:3). With a single extraction, the maximum amount of uranium passing into the organic solvent attained 96.5%.

ISSN:0009-4536    

DOI:10.1002/jccs.196100035

出版商:WILEY‐VCH Verlag    

年代:1961

数据来源: WILEY

摘要:

AbstractThe reactions of some of theo‐carboxy‐tropolones were investigated, their functional derivatives were made, and the physical properties of these derivatives were descri

ISSN:0009-4536    

DOI:10.1002/jccs.196100036

出版商:WILEY‐VCH Verlag    

年代:1961

数据来源: WILEY

摘要:

AbstractThe highest number of chlorine atoms introducible into the tropolone nucleus in hinokitiol is three. The introduction of chlorine atom into isopropyl group in hinokitiol occurs when at least two atoms of chlorine have been already present in the tropolone nucleus. Chlorine atoms introduced into isopropyl group are easily hydrolyzed or eliminated as hydrogen chloride, leaving an ethylenic linkage. The chloro‐derivative of hinokitiol in which the greatest number of chlorine atoms have been introduced is pentachloro‐hinokitiol. This latter substance is rather unstable. It can be produced only in very inferior yields because in the course of its preparation aromatization reaction occurs to a much greater extent as soon as chlorine atoms are introduced into the isopropyl group. The main product is a highly chlorinated cuminic acid having six atoms of chlorine (three in benzene nucleus and the other three in isopropyl). It is easily hydrolyzed even in contact with water when all of the chlorine atoms in the side‐chain are changed to hydroxyl groups, resulting in the formation of a δ‐lactone which on treatment with alcoholic ammonia affords the correspondin

ISSN:0009-4536    

DOI:10.1002/jccs.196100037

出版商:WILEY‐VCH Verlag    

年代:1961

数据来源: WILEY

摘要:

AbstractFor antimicrobial study, β‐(2‐benzofuryl)acrylic acid has been synthesized in eighty per cent yield by the Knoevenagel reaction. Also prepared were its fifteen derivatives. In a preliminary antifungal test, the free acid exhibited a marked activity, while its functional derivatives were either less active or completely inactive under similar experimental conditions. The detailed results of the antifungal and antibacterial studies will be reported l

ISSN:0009-4536    

DOI:10.1002/jccs.196100038

出版商:WILEY‐VCH Verlag    

年代:1961

数据来源: WILEY

ISSN:0009-4536    

DOI:10.1002/jccs.196100039

出版商:WILEY‐VCH Verlag    

年代:1961

数据来源: WILEY