摘要:

AbstractThe speed of decomposition of solutions of chromic acid in strong (e.g. 100%) sulphuric acid is reduced by the product of the reaction, a nearly colourless substance which precipitates when its solution is heated.The formation of this precipitate and the reduction of the speed of reaction may be observed also when a slight amount of water is present, both effects increasing with increasing sulphuric acid content.A positive autocatalytic effect in more diluted sulphuric acid is already knownH. C. S. Snethlage. Rec. trav. chim. 55, 874 (1936)..In combination with the hypothesis which was developed for the explanation of the variations of the speed of decomposition, which result from a change in the composition of the solventH. C. S. Snethlage, Rec. trav. chim. 55, 712 (1936)..), these two catalytic effects allow the understanding of the behaviour of decomposing solutions of chromic acid at any composition of the solvent (at least above 60% acid) and at any stage of the decomposition.

ISSN:0165-0513    

DOI:10.1002/recl.19380570502

出版商:WILEY‐VCH Verlag    

年代:1938

数据来源: WILEY

摘要:

AbstractThe analogy mentioned in the title of this paper is discussed using the experimental and theoretical results obtained up to now.

ISSN:0165-0513    

DOI:10.1002/recl.19380570503

出版商:WILEY‐VCH Verlag    

年代:1938

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19380570504

出版商:WILEY‐VCH Verlag    

年代:1938

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19380570505

出版商:WILEY‐VCH Verlag    

年代:1938

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19380570506

出版商:WILEY‐VCH Verlag    

年代:1938

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19380570507

出版商:WILEY‐VCH Verlag    

年代:1938

数据来源: WILEY

摘要:

AbstractThe investigation of this essential oil showed that it contains 2‐decene‐1‐alI published a preliminarycommunication on 2‐decene‐1‐a1 in Proc. Royal Netherlands Acad. Amsterdam 32 (1929)..) as its principal constituent. Further 2‐octene‐1‐al was encountered in the lower boiling fractions, as well as a small amount of a laevorotatory terpene boiling at 165° and finally some acids, probably already partially produced by the oxidation of the aldehydes in air in the steam distillation and further on storage in incompletely filled or incompletely closed bottles. 2‐dodecene‐1‐al was detected in the

ISSN:0165-0513    

DOI:10.1002/recl.19380570508

出版商:WILEY‐VCH Verlag    

年代:1938

数据来源: WILEY

摘要:

Abstract9‐[2′, 3′‐Dihydroxypropyl]‐isoalloxazin und andere Flavine können mit Wasserstoff und Platin zu Octahydroderivaten reduziert werden. Diese fluorescieren gelbgrün und werden in alkalischer Lösung durch Sauerstoff zu den blau fluorescierenden Hexahydroflavine

ISSN:0165-0513    

DOI:10.1002/recl.19380570509

出版商:WILEY‐VCH Verlag    

年代:1938

数据来源: WILEY

摘要:

AbstractHexadecene‐9‐oic acid, observed many years ago in seal, cod, and other oils of marine animals, and later recognised as a prominent constituent of nearly all marine animal fats, has more recently been found to be present in reserve fats throughout both animal and vegetable kingdoms. It is present in some quantity in the fats of amphibia, reptiles, rodents, and birds, and in minor amounts in the depot and milk fats of higher animals such as oxen, pigs or goats. It also occurs in very small quantities in vegetable seed fats, whilst, in fats of the simpler forms of vegetable organisms, it is frequently an important constitu

ISSN:0165-0513    

DOI:10.1002/recl.19380570510

出版商:WILEY‐VCH Verlag    

年代:1938

数据来源: WILEY

摘要:

AbstractDie in den Agatho‐Kopalen vorkommende Agathen‐disäure ist wahrscheinlich ein regelmässig gebautes Diterpen, in welchem die Lage einer Methylgruppe und eines Carboxyls noch nicht genau bekannt war. Nach Methoden, die sich bei der Aufklärung der Abietinsäure bewährt hatten, wurde die Ortsbestimmung dieses Carboxyls durc

ISSN:0165-0513    

DOI:10.1002/recl.19380570511

出版商:WILEY‐VCH Verlag    

年代:1938

数据来源: WILEY