摘要:

AbstractMixtures of thorium and uranyl perchlorates and sulfosalicylic acid have been studied by potentiometric titration with sodium and ammonium hydroxides, respectively, using glass electrode as indicator electrode. No precipitation was observed in these titrations up to pH 8 in the presence of an excess of sulfosalicylic acid. The reaction between thorium and sulfosalicylate ions has been studied spectrophotometrically, using 1:1 uranyl sulfosalicylate complex as an indicator. The latter complex was reinvestigated at pH 3.7 for comparison. By employing Job's method of continuous variations, it was found that thorium and sulfosalicylate ions reacted in a 1:1 ratio at pH 3.7, showing that an exchange reaction had taken place between thorium salt and uranyl sulfosalicylate.

ISSN:0009-4536    

DOI:10.1002/jccs.195700001

出版商:WILEY‐VCH Verlag    

年代:1957

数据来源: WILEY

摘要:

AbstractThe M.O. theory is applied to the case of hyperconjugation in ortho‐, meta‐, and para‐xylene. The results obtained are listed. Physical and chemical properties of xylene in relation to toluene and benzene are briefly discussed. The isomerism in xylene originates from the polarization effect, notwithstanding the fact that each isomer exhibits identical polarizability through degen

ISSN:0009-4536    

DOI:10.1002/jccs.195700002

出版商:WILEY‐VCH Verlag    

年代:1957

数据来源: WILEY

摘要:

AbstractBöttcher's formula for the molecular refraction of dissolved electrolytes is used to interprete the refractive index versus concentration curve previously obtained for the aqueous solutions of some long‐chain anionic colloidal electrolytes.The plotting of the reciprocal of polarisabilicy of dissolved long‐chain anion as a function of\documentclass{article}\pagestyle{empty}\begin{document}$$ \frac{{2{\rm n}^2 - 2}}{{2{\rm n}^2 + 2}} $$\end{document}under two different temperatures gives two straight lines A, B and non‐linear parts C, as being shown in Fig. 1.It is concluded that (1) the straight line A corresponds to a linear relation between\documentclass{article}\pagestyle{empty}\begin{document}$$ \frac{1}{{\alpha *_{X^ -}}} $$\end{document}and\documentclass{article}\pagestyle{empty}\begin{document}$$ \frac{{2n^2 - 2}}{{2n^2 + 1}} $$\end{document}for simply dissociated long‐chain anion X−, (2) the other straight line B to a same relation between\documentclass{article}\pagestyle{empty}\begin{document}$$ \frac{\nu}{{\alpha *_{\left({^\alpha \nu} \right)^ -} \nu}} $$\end{document}and\documentclass{article}\pagestyle{empty}\begin{document}$$ \frac{{2{\rm n}^2 - 2}}{{2{\rm n}^2 + 2}} $$\end{document}for ionic micelle (xν)−ν, after reaching the ultimately definite structure, and (3) the non‐linear parts C may be interpreted as a transition stage for long‐chain anions from the state of simply dissociated ones to the state of ionic micelle with its ultimate definite structure, and suggests that the formation of micelle with its ultimate definite structure may be accomplished gradually over a wider range of concentration, but not in

ISSN:0009-4536    

DOI:10.1002/jccs.195700003

出版商:WILEY‐VCH Verlag    

年代:1957

数据来源: WILEY

摘要:

AbstractRefractive index of dilute aqueous solution of potassium dodecyl sulfonate and sodium dodecyl sulfate have been measured as a function of concentration at 25°C. It is found that the feature of the refractive index curve resembles that of those curves for specific conductivity and density and that the intersection of the resulting two straight lines determines the critcal concentration for the formation of micelles

ISSN:0009-4536    

DOI:10.1002/jccs.195700004

出版商:WILEY‐VCH Verlag    

年代:1957

数据来源: WILEY

摘要:

AbstractA kinetic study on the formation of dipicrylamine by the interaction of dipicrylaminate and hydrogen ion was carried out amperometrically in a series of buffers of pH 3‐5 at 25°C. The order of reaction was estimated and the rate constants in various buffers were calculated in which the effects of the reverse reaction and the total ionic strengths of the solutions were taken into cosideration. The effect of pH on the rate constant was also observed and the true rate constant of the reaction was computed. From the knowledge of the dissociation constant of dipicrylamine, the rate constant for the reverse reaction could be evaluated. Polarographic behavior of dipicrylaminate in low pH range was reinvestigated and the reliability of the experimental procedure was verifi

ISSN:0009-4536    

DOI:10.1002/jccs.195700005

出版商:WILEY‐VCH Verlag    

年代:1957

数据来源: WILEY

摘要:

AbstractThorium activity of atomic number 234 (UX1,) can be separated by anion exchange method. UX1can be retained in the resin column of Amberlite IRA 400 in nitrate form when uranyl nitrate in 7.5 N nitric acid solution is allowed to pass through it. Uranyl ion absorbed is washed out of the resin column with the washing solution of nitric acid at the same concentration, while UX1retained in the column can be recovered simply by using water as an eluent, The experimental results obtained by using batch method as well as column method suggest that the concentration of acid should be kept above 7 N if the recovery of more than 85% of UX1in original uranyl nitrate solution is desired.Effects of the presence of anions other than nitrat ion in acid solution were studied by using batch method. The results indicate that, with the exception of phosphate and iodate, the anions under investigation did not produce any perceptible effect. The phosphate and iodate anions exhibited slightly less absorption in the resin phase. The anions studied include the phosphate, sulphate, bromate, iodate, chloride, bromide, iodide and oxalate

ISSN:0009-4536    

DOI:10.1002/jccs.195700006

出版商:WILEY‐VCH Verlag    

年代:1957

数据来源: WILEY

摘要:

AbstractA variety of ureas and thioureas were treated with ethyl acetoacetate, ethyl n‐butylacetoacetate, and ethyl di‐n‐butylacetoacetate under acidic, basic, and neutral conditions. Under acidic conditions, ethyl acetoacetate reacted only with urea or methylurea; under neutral conditions, it reacted only with thiourea; under basic conditions, it reacted only with thiourea, methylthiourea and ethylthiourea. Ethyl n‐butylacetoacetate reacted only with thiourea in base, while ethyl di‐n‐butylacetoacetate failed to condense with urea or thiourea under all conditions.In the condensation reaction between acetoacetic ester and thioureas, it was found that (a) the reaction proceeded best with thiourea and ethyl acetoacetate; (b) introduction of a single alkyl group into either the thiourea or the acetoacetic ester molecular lowered the yield but did not preclude the reaction; (c) introduction of two alkyl groups distributed in any fashion between the thiourea and acetoacetic ester molecules precluded the reaction; and (d) only the 3‐alkyl thiouracils were obtained from alkyl thioureas. A probable mechanism, based on the resonance theory, has

ISSN:0009-4536    

DOI:10.1002/jccs.195700007

出版商:WILEY‐VCH Verlag    

年代:1957

数据来源: WILEY

摘要:

Abstract7‐Hydroxy 4‐isopropyl torpolone (7‐hydroxy hinokitiol) was synthesized from bromo‐and iodohinokitiol. Its 7‐isopropoxy and 7‐phenoxy derivatives were also synthesized by the Ullmann reaction in good yields. The nature of these compounds were compared with that o

ISSN:0009-4536    

DOI:10.1002/jccs.195700008

出版商:WILEY‐VCH Verlag    

年代:1957

数据来源: WILEY

摘要:

AbstractTwo neutral triterpenoid sapogenins have been isolated from the fruits of Barringtonia racemosa, Blume. One of them, R2‐Barringenol is possibly identical with Barringtogenol (2:3:23:28‐tetra‐hydroxyolean‐12‐ene) and the other, R1‐Barrigenol: C30H50O7, is believed to be a heptahydroxy triterpenoid alcohol and is a member of the β

ISSN:0009-4536    

DOI:10.1002/jccs.195700009

出版商:WILEY‐VCH Verlag    

年代:1957

数据来源: WILEY

摘要:

Abstract9‐Phenyl‐1,2,3,4,5,6,7,8‐octahydrodibenzo‐γ‐pyran (V) was obtained from the mother liquor of crude 2,6‐dibenzylidenecyclohexanone (DBH) (1).Oxidation of 2,5‐dibenzylidenecyclopentanone (DBP) and DBH yielded benzoic and succinic acids, and benzoic, glutaric and 2‐benzylideneadipic acids respectively. Chromic acid oxidation of DBH gave benzaldehyde and benzoic acid, while that of the DBH dimer did not yield either of the two products.The formation of the DBH dimer by refluxing DBH in ethanol was inhibited by acid, alkali, rubber stopper, and sulfur, but was not affected by soft glasswares.Two dimers and three monomeric isomers of DBH were isolated, two of them probably represent cis forms.Thermal isomerization and dimerization of dibenzylideneacetone, difurfurylideneacetone, and difurfurylidenecyclohexanone were also studied. The latter two compounds were failed to give even a trace of the expected isomers or dimers.DBH gave, with phenylhydrazine, 2,3‐diphenyl‐7‐benzylidenecyclohexa‐pyrazoline (XII), while DBP with the same reagent at 190‐200° afforded benzaldehyde phenylhdrazone, ammonia, and water. The tetra‐bromide of DBP (XV) and phenylhydrazine readily gave

ISSN:0009-4536    

DOI:10.1002/jccs.195700010

出版商:WILEY‐VCH Verlag    

年代:1957

数据来源: WILEY