摘要:

AbstractLes écarts des hydrocarbures gazeux aux lois des gaz parfaits nécessitent l'application de deux corrections dans les analyses à volume constant. Ces deux corrections, celle de Dalton et celle d'Avogadro, sont calculées pour différents hydrocarbures et pour leurs mélanges. Elles sont comparées aux corrections analogues qui sont nécessaires dans les analyses à pression constante et qui ont été décrites ant

ISSN:0165-0513    

DOI:10.1002/recl.19400590102

出版商:WILEY‐VCH Verlag    

年代:1940

数据来源: WILEY

摘要:

Abstract1.Rats' liver‐extract contains substances titratable with iodine (probably ascorbic acid and glutathione), which disappear after shaking for two hours at 37°. Erythrocytes contain a reducing system, capable of preventing this oxidation.2.The mechanism of the respiratory reaction nevertheless cannot be identical with that of the ascorbic acid system of Von Szent‐Györgyi.3.A reversible or irreversible process of blood destruction cannot be the cause of the Michaelis‐Salomon effect, for liver‐extracts cause only a slight oxidation of haemochromogen, and spleen extract does not augment the oxygen consumption of a combination of liver‐extract and e

ISSN:0165-0513    

DOI:10.1002/recl.19400590103

出版商:WILEY‐VCH Verlag    

年代:1940

数据来源: WILEY

摘要:

Abstract1It is probable that the “original” yellow enzyme system of Warburg is responsible for a part of the Michaelis Salomon reaction.2There are strong arguments against the functioning of amino‐acid oxidase and xanthine ox

ISSN:0165-0513    

DOI:10.1002/recl.19400590104

出版商:WILEY‐VCH Verlag    

年代:1940

数据来源: WILEY

摘要:

AbstractA complete conversion is obtained in 10 hours by boiling an anhydrous benzene solution ofl‐ecgonine methyl ester with benzoyl chloride in the presence of dry sodium carbonate, calcium oxide or a mixture of calcium oxide and hydroxide. In chloroform solution about 20 hours are necessary and in ethereal solution about 40 hours, when a mixture of calcium oxide and hydroxide is use

ISSN:0165-0513    

DOI:10.1002/recl.19400590105

出版商:WILEY‐VCH Verlag    

年代:1940

数据来源: WILEY

摘要:

AbstractThe reaction between 1 : 2‐diaminoethane hydrate and 1 :6‐dibromohexane furnishes polyamines containing straight chains of dimethylene and hexamethylene groups separated by nitrogen atoms. A small quantity of a cyclic amine, 1‐(2′‐aminoethyl)‐1‐aza‐cyclo‐heptane, is also formed and the yield of the latter is relatively increased when very dilute solutions of the reaction components are used.A survey is made of the reaction between an excess of 1 : 2‐diaminoethane hydrate and the various

ISSN:0165-0513    

DOI:10.1002/recl.19400590106

出版商:WILEY‐VCH Verlag    

年代:1940

数据来源: WILEY

摘要:

AbstractLe mémoire décrit trois représentants simples des acides arsonocarboxyliques non saturés: les acides α‐arsonacrylique, α‐arsonocrotonique et β‐arsonocrotonique. L'action de l'arsénite de potassium sur les acides α‐bromocrotonique et α‐bromoisocrotonique conduit au même acide α‐arsonocrotonique: les acides β‐chlorocrotonique et β‐chloroisocrotonique donnent également le même acide β‐arsonocrotonique.La fonction arsonique ‐AsO3H2donne lieu à la formation d'ortho‐esters avec les 1,2‐diols.La formation des acides arsonocarboxyliques aux dépens d'arsénite et d'acides chlorocarboxyliques apparaît, dans certaines conditions, comme une réaction bimoléculaire.Les acides arsonocarboxyliques sont tribasiques; leurs trois constantes de dissociation o

ISSN:0165-0513    

DOI:10.1002/recl.19400590107

出版商:WILEY‐VCH Verlag    

年代:1940

数据来源: WILEY

摘要:

AbstractAn attempt is made to bring into a closer correlation the conceptions of “bound” and “intramicellar” water. For this purpose we made use of gelatine gels containing cobaltous chloride, observed the colour, typical for different amounts of adsorbed water (an indication for “free” or “bound” water) and found by means of X‐ray spectrography the magnitude of the “side chain spacing” (measure for intramicellar water) in dependance on the amount of adsorbed water. The results obtained for gels of low cobaltous chloride content are valid f

ISSN:0165-0513    

DOI:10.1002/recl.19400590108

出版商:WILEY‐VCH Verlag    

年代:1940

数据来源: WILEY

摘要:

AbstractIn a preceding communication it has been shown, that the energy involved in the process of stretching to rupture of air dry isotropic cellulose filaments is large enough to bring about a considerable drop in the average molecular weight of the material if this energy should, to any appreciable extent, be connected with the rupture of primary valencies in the molecular chains.Viscosity determinations in two different solvents show however, that there is no detectable difference in viscosity between solutions of unstretched and stretched filaments. Consequently, no molecular chains are broken in the process of deformation and rupture of cellulose filaments.

ISSN:0165-0513    

DOI:10.1002/recl.19400590109

出版商:WILEY‐VCH Verlag    

年代:1940

数据来源: WILEY

摘要:

Abstract“Hydrotropie” ist die Fähigkeit wässriger Salzlösungen, in Wasser unlösliche Körper aufzulösen. Diese Eigenschaft kommt Alkalisalzen von Söuren der C7‐ und C8‐Reihe zu. Vergleichsweise wurden untersucht:n‐heptylsaures, benzoesaures, hexahydrobenzoesaures und methyl‐cyclopentan‐carbonsaures Natrium. Das Auflösungsvermögen des Heptylats war meist grösser als das der cyclischen Verbindungen; von ihnen wirken die hydroaromatischen Vertreter, insbesondere das Cyclopentan‐derivat, kräftiger als die rein aromatische Substanz. Auch zwischen den correspondierenden Körpernn‐Caprylat, Phenyl‐acetat sowieo‐, m‐u.p‐Toluylat offenbaren sich Unterschiede. Hydrotropic ist ferner bei den isomeren Stoffenp‐toluolsulfosaurem u. benzylsulfosaurem Natrium nachzuweisen. Manche Beobachtungen sprechen zu Gunsten der Anschauung, dass Additionen unter Bildung instabiler Abkömmlinge von Ortho‐säure

ISSN:0165-0513    

DOI:10.1002/recl.19400590110

出版商:WILEY‐VCH Verlag    

年代:1940

数据来源: WILEY

摘要:

AbstractHydroxymethyl‐benzamide and hydroxymethylphthalimide interact with uracil in the presence of concentrated sulfuric acid. Substitution takes place in the 5‐position of the uracil molecule giving derivatives of thymine namely: benzoylthyminylamine and 5‐phthalimidomethyluracil respectively.These two derivatives of thymine undergo hydrolysis with regeneration of uracil by digestion with acids.Neither of these two acylderivatives of thyminylamine can be recommended as practical intermediates for the synthesis of reduced pyrimidine derivatives related to thiamin

ISSN:0165-0513    

DOI:10.1002/recl.19400590111

出版商:WILEY‐VCH Verlag    

年代:1940

数据来源: WILEY