摘要:

Im Nachfolgenden werden einige bisher in Zeitschriften noch nicht veröffentlichte Nachweise mit Hilfe von Tüpfel Reaktionen beschrieben: Nachweis von Wolfram mit Diphenylin, Nachweis von Calcium mit Dioxyweinsäure Osazon, Nachweis von Natrium mit Zn‐ Uranylacetat, Nachweis von Hydrazin mit Salicylaldehyd, Nachweis von Hydroxylamin mit Salicylaldehyd und Kupfersalz, Nachweis von Stickstoffwasserstoffsäure durch Bildung von Silber‐ oder Eisenazid, Nachweis von Ferrocyanid mit Uranylacetat, Nachweis von Ferricyanid mit Benzidin, Nachweis von Chlorat und Perjodat durch Bildung von komplexen Mangan (III)‐ Phosphat, Nachweis von Sulfat mit Bariumcarbonat und Pheno

ISSN:0165-0513    

DOI:10.1002/recl.19390580602

出版商:WILEY‐VCH Verlag    

年代:1939

数据来源: WILEY

摘要:

AbstractA study was made of the removal of different types of defines (aliphatic straight chain‐ and iso‐olefines with 5 to 8 carbon atoms, hexadiene‐2,4 and cyclohexene) from hydrocarbon mixtures by means of thioglycolic acid. The rate of reaction between thioglycolic acid and these olefines (diluted with given quantities of non‐olefines) when measured under given conditions, varied greatly with the structure of the olefines. Reaction conditions were traced under which the reaction with almost all the olefines examined was practically complete. The reaction products could be removed in a simple manner upon which the quantity of aromatics, paraffins and naphtenes in the residual hydrocarbon mixture could be determined by the usual

ISSN:0165-0513    

DOI:10.1002/recl.19390580603

出版商:WILEY‐VCH Verlag    

年代:1939

数据来源: WILEY

摘要:

AbstractThe X‐ray pattern of irisin like that of inulin shows definite Intensity changes when the material is dried. This indicates that the absorption of water is predominantly intermicella

ISSN:0165-0513    

DOI:10.1002/recl.19390580604

出版商:WILEY‐VCH Verlag    

年代:1939

数据来源: WILEY

摘要:

AbstractThis investigationPart of dissertation by H. A. Bakels, Leiden, 1938.deals with the hydrazides of malonic, succinic and citric acids, all three of which are sweet substances, and their derivatives, obtained by condensation with aldehydes and ketones, which are, in general, bitter when they are soluble in water.Esters of phthalic acid, isophthalic acid and terephthalic acid also have been treated with hydrazine hydrate, and the hydrazides obtained and their condensation products with aldehydes and ketones examined as regards their taste. The action of hydrazines on phthalic anhydride has also been investigated.We have also examined the hydrazides of some 2‐hydroxymethylbenzoic acids, prepared by opening the lactone ring in phthalide, nitrophthalide and aminophthalide with hydrazine. Finally, we opened the ring in meconine, nitromeconine and aminomeconine, these compounds being derivatives of phthalide containing two methoxy groups. Bitter substances were obtained by condensing these substances with aldehydes and ketone

ISSN:0165-0513    

DOI:10.1002/recl.19390580605

出版商:WILEY‐VCH Verlag    

年代:1939

数据来源: WILEY

摘要:

AbstractOur research on the occurrence of free radicals with only two unconnected aromatic groups on the central atom, has now been extended to reactions of molecular silver with:a.bis‐phenyl‐chloromethane;b.bis‐(4‐methoxyphenyl)‐chloromethane;c.bis‐(2:4:6‐triethylphenyl)‐chloromethane.We always found indications of the occurrence of free radicals.We shall report on these reactions in detail in a subsequent communication. Of the substances required for this investigation, only bis‐(2:4:6‐triethylphenyl)‐chloromethane has not been described in the literature.Therefore in this communication we describe the prepara

ISSN:0165-0513    

DOI:10.1002/recl.19390580606

出版商:WILEY‐VCH Verlag    

年代:1939

数据来源: WILEY

摘要:

AbstractThe method of isolation, properties and structure of the narcotic substance from kawa‐kawa (P. methysticum), are described. This substance occurs in a concentration of 1% in the dried plant material (old stems and roots) and is the actual active substance in this material. The active substance, marindinin, is easily obtained in a crystalline condition by a combination of an appropriate method of extraction with adsorption analysis. The ultimate purification is much more troublesome. Finally, marindinin appeared to be identical with the dihydrokawain of Borsche, who did not recognise this substance as the active principle, however, which he was able to isolate only with difficulty and in very small yield from the kawa resin. Attention is drawn to the fact that marindinin must be brought into the form of a fine emulsion before it can exert its narcotic qualitie

ISSN:0165-0513    

DOI:10.1002/recl.19390580607

出版商:WILEY‐VCH Verlag    

年代:1939

数据来源: WILEY

摘要:

Dans une communication de l'un de nous et de MM W. D, Cohen et C. J. KipJ. Böeseken, W. D. Cohen et C. J. Kip, Rec. trav. chim.55, 815 (1936)., nous avons montré que le pipéronal est attaqué par CH3CO3H avec formation d'acétate du sésamol et d'acide formique. Nous avons appliqué cette même méthode d'oxydation à quelques autres dérivés de l'aldéhyde protocatéchique et nous avons constaté que les éthers dialkyliques donnent, en effet, les acétates de 3,4 dialkoxyphénols mais si, au lieu d'un groupe alkyle, on introduit en position 4 un groupe acide, comme p. ex. le groupe acétyle, la réaction prend un autre cours: le groupe aldéhydique n'est pas délié, mais oxydé.L'acétylvanilline p. ex. donne

ISSN:0165-0513    

DOI:10.1002/recl.19390580608

出版商:WILEY‐VCH Verlag    

年代:1939

数据来源: WILEY

摘要:

Nachdem ich in der zweiten MitteilungI. J. Rinkes, Rec. trav. chim.58, 218 (1939).über dieses Thema meinen Befund berichtet hatte, dass die Säure aus dem Nitrat von Huender aus zwei isomeren Säuren besteht, ist es mir jetzt gelungen, das 2,5‐Dimethyl‐3,6‐dinitro‐4‐brombenzylnitrat und das 2,4‐Dimethyl‐3,6‐dinitro‐5‐brombenzylnitrat, ausgehend von Para‐ und Metaxylen, zu synthetisieren und ihre Eigenschaften mit dem Nitrat vo

ISSN:0165-0513    

DOI:10.1002/recl.19390580609

出版商:WILEY‐VCH Verlag    

年代:1939

数据来源: WILEY

摘要:

AbstractThe reaction between 1:2‐diaminoethane and 1:10‐dibromodecane furnishes solid polyamines, containing straight chains of dimethylene and decamethylene groups separated by nitrogen at

ISSN:0165-0513    

DOI:10.1002/recl.19390580610

出版商:WILEY‐VCH Verlag    

年代:1939

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19390580611

出版商:WILEY‐VCH Verlag    

年代:1939

数据来源: WILEY