摘要:

AbstractThe addition of hydrochloric acid gas at about −78°C to several olefines of different structure has been studied. Some experiments were carried out without a catalyst, while in others aluminium chloride was used as catalyst.From the results obtained it was possible to deduce some general principles and facts, especially about the relation between the velocity of addition of hydrochloric acid and the structure of the olefines in questi

ISSN:0165-0513    

DOI:10.1002/recl.19380570802

出版商:WILEY‐VCH Verlag    

年代:1938

数据来源: WILEY

摘要:

AbstractSystematic vulcanisation experiments have confirmed and extended the observation of Eaton and Bishop, that small amounts of arsenious oxide show a large acceleration in rubber‐sulphur mixings. Vulcanisation experiments with various arsenicals showed that arsenious oxide and arsenious sulphide are the most active accelerators, arsenic oxide and the pentasulphide being less active, followed by elementary arsenic and sodium cacodylate.In quick curing mixings with modern organic accelerators and zinc oxide arsenicals do not show any effect.Neither extraction with acetone nor deproteinisation of the rubber has much influence on the acceleration of arsenious oxide. The vulcanisates show bright yellow spots, which appear to be hollow globules of arsenious sulphide. In considering this fact, some suggestions are made as to the mechanism of the acceleration by arsenious oxide. It is supposed that the presence of nascent hydrogen sulphide plays an important role during vulcanisatio

ISSN:0165-0513    

DOI:10.1002/recl.19380570803

出版商:WILEY‐VCH Verlag    

年代:1938

数据来源: WILEY

摘要:

On a essayé de mesurer la vitesse d'oxydation de quelques sulfones non saturées par la méthode décrite par StuurmanJ. Stuurman, Thèse Delft 1936.). Ces mesures n'ont, toutefois, pas pu être reproduites; à cause de la vitesse d'oxydation très petite, les réactions secondaires ont été beaucoup plus génantes que dans le cas des hydrocarbures examiné par Stuurman. Quelques mesures, qui ont été effectuées, donnent, néanmoins, certaines indications sur la nature des perturbat

ISSN:0165-0513    

DOI:10.1002/recl.19380570804

出版商:WILEY‐VCH Verlag    

年代:1938

数据来源: WILEY

摘要:

Es wird die Bereitung von Quecksilbersalz‐Additionsverbindungen mit Safrol, Eugenol und Eugenolmethylaether beschriebe

ISSN:0165-0513    

DOI:10.1002/recl.19380570805

出版商:WILEY‐VCH Verlag    

年代:1938

数据来源: WILEY

摘要:

AbstractIn this article, a description is given of disintegration phenomena found in isolated fibrils of frogs muscle in an investigation of ethyl xanthine onM. gastrocnemiusfromR. TemporariaandR. esculenta.

ISSN:0165-0513    

DOI:10.1002/recl.19380570806

出版商:WILEY‐VCH Verlag    

年代:1938

数据来源: WILEY

摘要:

Untersucht wurde das Verhalten der beiden Mono‐, bezw. Ditritylglycerole gegenüber Bleitetracetat in benzenischer und essigsaurer Lös

ISSN:0165-0513    

DOI:10.1002/recl.19380570807

出版商:WILEY‐VCH Verlag    

年代:1938

数据来源: WILEY

摘要:

AbstractThis investigation is an attempt to use benzaldehyde and oxygen instead of perbenzoic acid as an oxidising agent.

ISSN:0165-0513    

DOI:10.1002/recl.19380570808

出版商:WILEY‐VCH Verlag    

年代:1938

数据来源: WILEY

摘要:

AbstractWhen indigo was nitrated with absolute nitric acid, either directly or dissolved in sulphuric acid or acetic acid only decomposition products, containing nitrated isatins, could be obtained, but when indigo was nitrated in acetic anhydride, well defined products could be prepared. These were derivatives of 2‐acetoxy‐3: 3'‐diketo‐diindolinyl‐2: 2' into which one, two or three nitro groups were introduced, depending on the amount of nitric acid used. on heating, these compounds split off a molecule of acetic acid and mono‐, di‐, or tri‐nitroindigos remained behind. An analogous result was obtained, when indigo was nitrated in butyric anhydride. Indigo could also be nitrated in acetyl chloride but 5‐chloroisatin

ISSN:0165-0513    

DOI:10.1002/recl.19380570809

出版商:WILEY‐VCH Verlag    

年代:1938

数据来源: WILEY

摘要:

AbstractThe transition temperature of magnesium bromide has been measured by the thermometric method and found to be 10.84°

ISSN:0165-0513    

DOI:10.1002/recl.19380570810

出版商:WILEY‐VCH Verlag    

年代:1938

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19380570811

出版商:WILEY‐VCH Verlag    

年代:1938

数据来源: WILEY