摘要:

AbstractIt is shown that measurement of the conductivity of micellar solutions provides a rather sensitive test regarding the size distribution of the micelles. In a number of systems the micelles are found to be practically uniform. In this case information on the equivalent conductance of the micellar soap can be obtained from the conductivity data in the range above the cmc. The data in the transition range (around the cmc) can be interpreted with the help of the law of massaction and lead to the molecular weight of the micelles.Anomalous conductivity curves with a maximum slope just above the cmc are interpreted in terms of a wide size distribution of the micelles.

ISSN:0165-0513    

DOI:10.1002/recl.19540730802

出版商:WILEY‐VCH Verlag    

年代:1954

数据来源: WILEY

摘要:

AbstractA simplified method is given for the analytical isolation of non‐saponifiable matter from oils.After saponification in alcohol the alcoholic soap solution is completely dissolved in a measured quantity of benzene and the benzene solution is washed with water. The concentration in the benzene solution is determined after drying. By this method the tedious operations of extraction and quantitative transfer of the extracts are avoided.This method is suitable for the determination of the vitamins A and

ISSN:0165-0513    

DOI:10.1002/recl.19540730803

出版商:WILEY‐VCH Verlag    

年代:1954

数据来源: WILEY

摘要:

AbstractThe synthesis of a number of 3‐(piperidyl‐(2)‐methyl‐) indoles and of some related compounds is described, together with that of an additional number of 3‐(piperidyl‐(N)‐methyl‐) indoles (cf.). An analysis of the relationship between structure and oxytocic activity (data ofvan Proosdij‐Hartzemaandde Jongh) shows that several structural and spatial details, decisive for the activity of the ergot alkaloids, have no such influence with the synthetic compounds, though the importance of the general pattern of the alkaloids is discernable. So the 3‐(piperidyl‐(2)‐methyl‐) indoles are found to be less active and less specific than the 3‐(pip

ISSN:0165-0513    

DOI:10.1002/recl.19540730804

出版商:WILEY‐VCH Verlag    

年代:1954

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19540730805

出版商:WILEY‐VCH Verlag    

年代:1954

数据来源: WILEY

摘要:

AbstractIn order to investigate the influence of the isopropyl group on the antirachitic properties of vitamin D, we synthesised a number of C24and C22Δ5‐keto‐steroids with C17side chains of varying length but all ending in a swallow‐tailed group. As starting materials 3β‐acetoxy‐Δ5‐cholenic acid (I) and the corresponding bisnorcholenic acid (IV) were available. These acids were transformed into their chlorides and made to react with suitable cadmium dialkyls. The latter were prepared from the Grignard reagents and anhydrous CdBr2, which proved much more react

ISSN:0165-0513    

DOI:10.1002/recl.19540730806

出版商:WILEY‐VCH Verlag    

年代:1954

数据来源: WILEY

摘要:

AbstractThe Δ5‐keto‐steroids described in our previous paper1) were made to react with dithioglycol. Mercaptals could only be obtained from C24ketones; they were reductively desulphurised to the Δ5‐androstene derivatives by boiling with Raney nickel in dioxan. LiAlH4did not attack the carbon‐sulphur bond of the mercaptals. All C22ketones were found to be subject to steric hindrance at the formation of m

ISSN:0165-0513    

DOI:10.1002/recl.19540730807

出版商:WILEY‐VCH Verlag    

年代:1954

数据来源: WILEY

摘要:

AbstractIt follows from measurements of the NH3‐pressures of preparations of ammonium phosphate with a composition intermediate between mono‐ and diammonium orthophosphate that no indication was obtained of the existence of a sesquiammonium orthophosphate, (NH4)3H3(PO4)2, as postulated byDe Passillé. At temperatures above 135° C water is also separated off, with the formation of polyphosp

ISSN:0165-0513    

DOI:10.1002/recl.19540730808

出版商:WILEY‐VCH Verlag    

年代:1954

数据来源: WILEY

摘要:

AbstractThis paper deals with the dimethyl and diethyl amides of Δ5‐cholenic acid and Δ5‐bisnorcholenic acid. These amides could be converted into the corresponding unsaturated tertiary amines by reduction with L

ISSN:0165-0513    

DOI:10.1002/recl.19540730809

出版商:WILEY‐VCH Verlag    

年代:1954

数据来源: WILEY

摘要:

AbstractSulphonylnitrosamides, ArSO2N(NO)R, when heated in inert solvents, undergo first order decomposition into nitrogen and alkyl arylsulphonates (ArSO3R). A mechanism involving an intermediate diazosulphonate (ArSO2ONNR) is propose

ISSN:0165-0513    

DOI:10.1002/recl.19540730810

出版商:WILEY‐VCH Verlag    

年代:1954

数据来源: WILEY

摘要:

AbstractSulphonylnitrosamides ArSO2N(NO)R with RC2H5, n‐C3H7, i‐C3H7and n‐C4H9undergo two types of decomposition in inert solvents at 95°, yieldinga.nitrogen and alkyl arylsulphonateb.nitrogen, arylsulphonic acid and olefin.The rate of gas evolution is strictly first order. This is compatible with a nitroso‐azo rearrangement as the rate‐determining step. The resulting diazosulphonate decomposes quickly into the products of eitheraorb.Under the influence of acid arising fromb, denitrosation becomes appreciable towards the end of reaction. Such denitrosation is not observed when RCH3, no acid (and olefin)

ISSN:0165-0513    

DOI:10.1002/recl.19540730811

出版商:WILEY‐VCH Verlag    

年代:1954

数据来源: WILEY