摘要:

AbstractThe unit cells and space groups of six salts of cyclononylamine (chloride, bromide, iodide, sulphate, selenate, and perchlorate) have been determined by X‐ray analysis. All the compounds, except the selenate which is probably disordered, contain more than one molecule in the asymmetric crystal uni

ISSN:0018-019X    

DOI:10.1002/hlca.19600430102

出版商:WILEY‐VCH Verlag GmbH    

年代:1960

数据来源: WILEY

摘要:

AbstractThe X‐ray analysis of cyclononylamine hydrobromide has revealed that the asymmetric unit of this crystal contains two structurally different molecules. The carbon skeletons of these two molecules are asymmetric and, although closely similar in general arrangement, differ from one another in terms of bond angles and torsion angles. The observed CC distances do not differ significantly from 1.54 Å; the CCC angles range from 111° to 124°, the mean value being 116° 43′. The torsion angles lie in the range 25° to 104°, syn‐planar and anti‐skew conformations being avoided in favour of nearly syn‐skew. The most striking point of difference between the two independent molecules is the position of attachment of the amino group. The local environment of this group in one ring is quite different from that in the other. The two molecules are, in fact, conformational i

ISSN:0018-019X    

DOI:10.1002/hlca.19600430103

出版商:WILEY‐VCH Verlag GmbH    

年代:1960

数据来源: WILEY

摘要:

AbstractCyclododecane crystallises at room temperature in the monoclinic system,a= 13.27 Å,b= 8.28 Å,c= 5.44 Å, β = 99° 32′ (Z = 2), space group C2/m. The crystal structure was determined from the three‐dimensional PATTERSONfunction and refind by three‐dimensional difference syntheses. Because of the large temperature factor and of disorder arising from the presence of statistical mirror planes aty= 0 andy= ½, the observed data are almost equally compatible with two possible molecular conformers. Both of these are built of four nearly planar zig‐zag units each of four atoms, with an atom shared in common between successive units, but the conformations about the CC bonds formed by the common atoms are all anti‐skew for one model and all syn‐skew for the other. Reasons are given for regarding the syn‐skew mod

ISSN:0018-019X    

DOI:10.1002/hlca.19600430104

出版商:WILEY‐VCH Verlag GmbH    

年代:1960

数据来源: WILEY

摘要:

AbstractOxidation of N‐(γ‐dimethylaminopropyl)‐iminodibenzyl hydrochloride (Tofranil®) with molecular oxygen in the presence of Fe2+salts, ethylenediamine‐tetraacetic acid and ascorbic acid leads to N‐(γ‐dimethylaminopropyl)‐2‐hydroxy‐iminodibenzyl in moderate yield. This product is identical with a metabolite of Tofranil® isol

ISSN:0018-019X    

DOI:10.1002/hlca.19600430105

出版商:WILEY‐VCH Verlag GmbH    

年代:1960

数据来源: WILEY

摘要:

AbstractEs wurde versucht, eine Erklärung der Metallionen‐Spezifität von ATP‐abhängigen Enzymreaktionen zu geben, die mit der Regel von IRVING‐WILLIAMSim Einklang steht. Es wurde theoretisch deduziert und experimentell bestätigt, dass verschiedenartige Überlagerung von Aktivierungs‐ und Hemmwirkung bei verschiedenen Metallionen eine solche Erkläru

ISSN:0018-019X    

DOI:10.1002/hlca.19600430106

出版商:WILEY‐VCH Verlag GmbH    

年代:1960

数据来源: WILEY

摘要:

AbstractAuf Grund von Abbauversuchen ist dem Aglykon aus Chartreusin die Formel IV und dem Antibiotikum selbst die Formel I zuzuschreiben.

ISSN:0018-019X    

DOI:10.1002/hlca.19600430107

出版商:WILEY‐VCH Verlag GmbH    

年代:1960

数据来源: WILEY

摘要:

AbstractIt is shown that diethylaminoethyl‐cellulose (DEAE‐cellulose) columns can be used for efficient chromatographic fractionation of polysaccharide mixtures. At about pH 6 neutral polysaccharides are not or only weakly adsorbed by DEAE‐cellulose. They can be readily eluted at the same pH by buffers of increasing strength. Neutral polysaccharides are adsorbed by DEAE‐cellulose in the hydroxyl form and can be fractionated by elution with NaOH of increasing strength. Acidic polysaccharides like pectic acid are adsorbed readily at neutral and weakly acidic pH values, but can only be eluted by increasing the pH. The use of the borate form of DEAE‐cellulose and elution with Na‐borate of increasing strength increases the fractionation effect. Examples are given for the fractionation of wheat starch dextrin, a mixture of sugar beet araban and pectic acid, sugar beet pectic acid, a mixture of wheat pentosan and serum albumin, and of the cold water‐soluble wheat flour po

ISSN:0018-019X    

DOI:10.1002/hlca.19600430108

出版商:WILEY‐VCH Verlag GmbH    

年代:1960

数据来源: WILEY

摘要:

AbstractEs wurden drei Modifikationen von wasserfreiem Zinkchlorid morphologisch und röntgenographisch untersucht

ISSN:0018-019X    

DOI:10.1002/hlca.19600430109

出版商:WILEY‐VCH Verlag GmbH    

年代:1960

数据来源: WILEY

摘要:

AbstractWasserfreies ZnBr2und ZnJ2wurde morphologisch und röntgenographisch untersucht

ISSN:0018-019X    

DOI:10.1002/hlca.19600430110

出版商:WILEY‐VCH Verlag GmbH    

年代:1960

数据来源: WILEY

摘要:

AbstractThe vapour‐liquid separation factors of the isotopic systems H 216O/H 218O and D 216O/D 218O have been determined by means of Rayleigh‐distillation of H2O and D2O respectively. The results obtained by mass‐spectrometric evaluation of the isotopic composition of oxygen in the water samples show that the separation‐parameter (δ = ln α) of the system D 216O/D 218O is some 10–15% lower than that of the system H 216O/H 218O. The temperature dependence of the separation‐parameters of both systems is given, showing generally poor agreement with the results of other authors concerning the system H 216O/H 218O. This investigation leads to a general principle stating that in compounds containing two species of isotopic elements, the isotope effect of the first element upon the separation‐factor of the isotopes of the second element has the same magnitude as the isotope effect of the second element upon the separation‐factor

ISSN:0018-019X    

DOI:10.1002/hlca.19600430111

出版商:WILEY‐VCH Verlag GmbH    

年代:1960

数据来源: WILEY