摘要:

AbstractThe aggregation phenomena of simple alcohols caused by hydrogen bonding in several organic solvents are studied by I. R. spectroscopy. The association constants of cyclic dimer of alcohols in CCI4are evaluated, and the importance of solvent bascity effecting on the OH band frequency shift has been discussed.

ISSN:0009-4536    

DOI:10.1002/jccs.197400025

出版商:WILEY‐VCH Verlag    

年代:1974

数据来源: WILEY

摘要:

AbstractEmphasis is placed upon selecting working fluid in the drinking bird heat engine. The power output is correlated with thermal efficiency, temperature gradient and heat transfer coefficient. Experimental results are illustrated by our theoretical approaches. We find that thermal efficiency will he largely improved if energy loss due to reheating is eliminated. Method of avoiding reheating and choice of connector height are also discussed. The selection of working fluid mainly depends upon temperature difference. Our theoretical development and experimental results are very useful in constructing a real engine.

ISSN:0009-4536    

DOI:10.1002/jccs.197400026

出版商:WILEY‐VCH Verlag    

年代:1974

数据来源: WILEY

摘要:

AbstractStudies on the isotropic hyperfine splitting constants of protiated and deuterated 3‐methylpentyl radicals produced by γ‐ray accompanied with the radical yield determinations reveal that the radicals are distributed in clusters in the matrix. A tentative mechanism with the migration of positive hole is proposed for the formation of UV‐induced new radicals following γ‐irradiation in 3‐methylpentane glasses at 77°K; and to account for all the experimental

ISSN:0009-4536    

DOI:10.1002/jccs.197400027

出版商:WILEY‐VCH Verlag    

年代:1974

数据来源: WILEY

摘要:

AbstractCobalt (II) and copper (II) chelates of 2‐picolylamine have been studied spectrophotometrically in aqueous solution. Formation of 2‐picolylamine chelates waspH dependent, and the optimumpH range of the cobalt (II) chelate was atpH 8.8‐9.6, and copper(II) chelate at 4.7‐6.8, respectively. Themoleratio of 2‐picolylamine to both of metal(II) ions was found to be 2 to 1 stoichiometry. The spectrophotometric sensitivities are 0.23γ of Co/Cm2and 8.9γ of Cu/Cm3, at 373mμ,pH 9.0 for Co(II) chelate and 588mμ,pH 6.0 for Cu (II) chelate. The stability constants (logK) of the chelates CoL22+and CuL22+have been evaluated at a constant ionic strength of 0.10 at 20, 25, 30, 35 and 40°C. Enthalpy and entropy changes characterizing the formation of the chelates have been calculated at 25°C The results are colle

ISSN:0009-4536    

DOI:10.1002/jccs.197400028

出版商:WILEY‐VCH Verlag    

年代:1974

数据来源: WILEY

摘要:

AbstractA simple quantitative method is developed for the determination of trace amount of chloride in uranium without preliminary separation. The reactions are realized by mixing the sample with saturated mercury thiocyanate alcohol solution and 0.325Mferric ion in 5.52Mperchloric acid solution. The wavelength 465mμ is used for the determination of chloride. The interference of uranium is negligible for uranium concentration less than 400ppm. When uranium concentration ranges from 400 to 1.2×104ppm, the interference can be calculated based on the constancy of molar absorptivity of uranium solution at wavelengthes 465mμ and 415mμ, therefore, a correction can be made for the determination of chloride. Interference of other factors were also investiga

ISSN:0009-4536    

DOI:10.1002/jccs.197400029

出版商:WILEY‐VCH Verlag    

年代:1974

数据来源: WILEY

摘要:

AbstractThe reaction of indole with propiolic acid ia 1 : 1moleratio gave an adduct (I) of 2 : 1 addition with decarboxylation. The reaction of indole with propiolic acid methyl ester gave a 2 : 1 adduct (II). Hydrolysis of adduct II yield the corresponding carboxylic acid (IV). Decarboxylation of IV also gave I. The mechanism of title reaction were fully studied.

ISSN:0009-4536    

DOI:10.1002/jccs.197400030

出版商:WILEY‐VCH Verlag    

年代:1974

数据来源: WILEY

摘要:

AbstractBenzaldehyde, 2‐pyridinecarbaldehyde, furfural, and 2‐thiophenecarbaldehyde were reduced to the corresponding primary alcohols in satisfactory yields with thiourea dioxide in ethanolic alkaline solution, but 2‐pyrrolecarbaldehyde, in very low yield. The reduction ofp‐dimethylaminobenzaldehyde with the same reagent, however, was found to afford bis(4‐dimethylaminophenyl

ISSN:0009-4536    

DOI:10.1002/jccs.197400031

出版商:WILEY‐VCH Verlag    

年代:1974

数据来源: WILEY

摘要:

AbstractThe reaction of excess dimethyl sulfoxide with ethyl bromoacetate has been shown to produce ethyl glyoxylate, hydrogen bromide, and dimethyl sulfide. The yield of glyoxylate at first was reduced because the dimethyl sulfide reacted with bromoacetate to form trimethylsulfonium bromide and ethyl (methylmercapto) acetate, presumably via carbethoxymethyldimethylsulfonium bromide. These side reactions were diminished in a thin‐film reactor, but the result was not satisfiable, the yield was 51%, and the side reactions were prevented by addition of methyl bromide, which rapidly consumed the dimethyl sulfide with formation of trimethylsulfonium bromide. Addition of 1, 2‐epoxy‐3‐phenoxypropane removed the hydrogen bromide, thereby preventing the deleterious effects casued by its reduction of dimethyl sulfoxide to dimethyl sulfide. In this way has been developed a convenient preparation of ethyl glyoxylate in yields averaging about 70%. Identification and stoichiometry of the reaction products are pr

ISSN:0009-4536    

DOI:10.1002/jccs.197400032

出版商:WILEY‐VCH Verlag    

年代:1974

数据来源: WILEY

摘要:

AbstractGamma‐ray induced gaseous phasein situpolymerization of vinyl chloride and copolymerization of vinyl chloride with vinyl acetate in bagasse have been investigated and discussed. The prepared bagasse‐plastic combinations were not improved of its mechanical strength owing to the deposited PVC powder and the low copolymer loading in bagasse‐board. The viscosity average molecular weight of PVC formed in bagasse‐board was found to be slightly higher than that of PVC formed in thein situliquid polymerization system. No graft reaction of PVC onto bagasse cellulose was observed, while low grade of graft reaction was confirmed with PVC‐PVAc copolym

ISSN:0009-4536    

DOI:10.1002/jccs.197400033

出版商:WILEY‐VCH Verlag    

年代:1974

数据来源: WILEY

摘要:

AbstractCobalt complex of 1‐(2‐quinolylazo)‐2‐phenanthrol (Co‐QAP) prepared by refluxing cobalt acetate and QAP in the molar ratio 1:2 has been used as a visual acid‐base indicator. The apparant indicator constant has been found to be 6.35. The solution of the indicator in dioxane is stable for at least fifteen days if stored in a dark coloured bottle, while in a transparent bottle it was found to be stable for

ISSN:0009-4536    

DOI:10.1002/jccs.197400034

出版商:WILEY‐VCH Verlag    

年代:1974

数据来源: WILEY