摘要:

AbstractPar la voie analytique et par la voie synthétique, nous avons déterminé la structure de deux produits, fondant respectivement à 166° et 156° et prenant naissance respectivement lors de la polymérisation sous l'action de la chaleur du méthyl‐ et de l'éthylchavicol. Contrairement à ce que l'on supposait, ce ne sont pas des dimères, mais des substances qui pourraient se former à partir de dimères par perte de deux atomes H. Il est possible que le dimère lui‐même ou le méthylchavicol fixent les deux atomes H.En dehors des substances que nous avons mentionnées dans des mémoires antérieurs, nous avons synthétisé également le l,6‐di‐phénétyl‐l,2,5.6‐tétr

ISSN:0165-0513    

DOI:10.1002/recl.19430620502

出版商:WILEY‐VCH Verlag    

年代:1943

数据来源: WILEY

摘要:

AbstractThe dipole moments of nitrosyl chloride and nitrosyl bromide were determined as 1.83 ± 0.01Dand 1.87D, respectively. These values are compared to those estimated for a pure homopolar structure ClNO. The conclusion is reached that an ionic structure: Cl−[N≡O]+makes a considerable contribution to the stationary state. This type of resonance, already deduced from a discussion of bond distances, is thus confirmed.The dielectric constant of the pure liquid was found to be ϵ = 18.2 at 12° for NOCl and ϵ = 13.4 at 15.2° for NOBr,

ISSN:0165-0513    

DOI:10.1002/recl.19430620503

出版商:WILEY‐VCH Verlag    

年代:1943

数据来源: WILEY

摘要:

AbstractThis problem was investigated especially on account of the great number of controversies found in the literature. For a historical review reference is made to the papers of Michel2) and Jung3). A photoelectric colorimeter and a photoelectric spectrometer being of essential importance in this investigation, they are described first. Michel's observation that SHb contains per equivalent one sulphur atom more than normal hemoglobin, was confirmed by analysis of SHb prepared in vivo. This extra sulphur can be split off with bromine, but not with acid or alkali. The molecular weight of SHb is equal to that of normal hemoglobin (68000). By the action of dilute acid about five times as much iron is split off from SHb as from normal hemoglobin (“easily detached iron”). The absorption spectra of several derivatives of SHb are given. It is shown that potassium ferricyanide oxidizes the bivalent iron of SHb to trivalent iron. The compound formed can best be called ferrisulfhemoglobin. A rough calculation of the oxidation potential is given. The action of KCN on ferri‐SHb causes the extra sulphur to be split off from SHb. The spectrum of the compound formed is very similar to that of cyanhemoglobin. An analogous fact is found for the porphyrin and the hemochromogen which can be prepared from SHb. The difference in structure between globin hemochromogen and hemoglobin is discussed. The product formed by the action of hydrogen peroxide and ammonium sulphide on hemoglobin is not, as Michel presumes SHb, but it is probably identical with the verdohemochromogen found by Jung. Experiments are described which show that the empirical reaction equation for the formation of SHb is:\documentclass{article}\pagestyle{empty}\begin{document}\[{\rm Hb}+{\rm H}_2{\rm S}+{\rm O}_2={\rm SHb + 2H}_{\rm 2}{\rm O}\]\end{document}Further, an explanation is given of the fact that it is impossible to convert more than 75% of the Hb into SHb. In conclusion a hypothesis is given concerning the structure o

ISSN:0165-0513    

DOI:10.1002/recl.19430620504

出版商:WILEY‐VCH Verlag    

年代:1943

数据来源: WILEY

摘要:

AbstractWith the aid of a new formula for the internal field a method is developed for computing the mean polarisability and the mean radius of molecules and ions from measurements of the density and the dielectric constant (or, alternatively, the index of refraction) of liquids.As examples, the radii and the polarisabilities of the CCl4‐molecule and of the I‐, CL−, Cs+ and Rb+ ions are calculated. The values obtained for the radii of the ions are in good agreement with those of Pauling and Goldsc

ISSN:0165-0513    

DOI:10.1002/recl.19430620505

出版商:WILEY‐VCH Verlag    

年代:1943

数据来源: WILEY

摘要:

AbstractΔ1‐pyrazolines, in which the double bond is situated between the two nitrogen atoms can be prepared by the addition of diphenyldiazomethane to the diphenyl ester of citraconic acid and to the trimethyl ester of aconitic acid. These compounds split off nitrogen at higher temperatures forming cyclopropane derivatives.Diphenyl diazomethane combines directly with citraconic acid anhydride, splitting off nitrog

ISSN:0165-0513    

DOI:10.1002/recl.19430620506

出版商:WILEY‐VCH Verlag    

年代:1943

数据来源: WILEY

摘要:

AbstractThe depression of the melting point of gelatin by the chlorides of some bivalent metals is determined. The radius of the cation appears to be a dominating factor. The relation between the radius of the ion and the concentration of the salt causing a definite depression is different for cations and anions, and for univalent and bivalent cations. Calcium forms an exception, as it has very nearly the same effect as strontium. The anomalous behaviour of beryllium chloride is discussed.

ISSN:0165-0513    

DOI:10.1002/recl.19430620507

出版商:WILEY‐VCH Verlag    

年代:1943

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19430620508

出版商:WILEY‐VCH Verlag    

年代:1943

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19430620509

出版商:WILEY‐VCH Verlag    

年代:1943

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19430620501

出版商:WILEY‐VCH Verlag    

年代:1943

数据来源: WILEY