摘要:

AbstractA discussion of the relationship between theoretical principles of chemical similarity on one hand and empirically measurable similarity on the other suggests that specifically adsorbing silica gels represent an experimentally simple model for ‘bioisomorphism’, the similarity found in biological syst

ISSN:0018-019X    

DOI:10.1002/hlca.19650480202

出版商:WILEY‐VCH Verlag GmbH    

年代:1965

数据来源: WILEY

摘要:

AbstractDie Herstellung von Methyläthern des Xanthophylls, Zeaxanthins, Capsanthins und Azafrins wird beschrieben, und es wird zur Frage der Konfiguration des Azafrins Stellung genommen

ISSN:0018-019X    

DOI:10.1002/hlca.19650480203

出版商:WILEY‐VCH Verlag GmbH    

年代:1965

数据来源: WILEY

摘要:

AbstractThe hitherto unknown compounds 5‐(2‐Pyridyl)‐thiazole and 2‐(N‐Thioformyl‐ω‐aminoacetyl)‐pyridine have been synthesized. The stability constants of the Cu2+‐1:1‐complexes of 5‐(2‐Pyridyl)‐thiazole, 2‐(2‐Pyridyl)‐thiazole and 4‐(2‐Pyridyl)‐thiazole have been measured and are discussed. Evidence for the coordination of the sulphur a

ISSN:0018-019X    

DOI:10.1002/hlca.19650480204

出版商:WILEY‐VCH Verlag GmbH    

年代:1965

数据来源: WILEY

摘要:

AbstractThe substances which give specific adsorbing footprints on silica gels seem to be those having sufficiently low Rf‐values in thin layer chromatograms on silica gel with water as solven

ISSN:0018-019X    

DOI:10.1002/hlca.19650480205

出版商:WILEY‐VCH Verlag GmbH    

年代:1965

数据来源: WILEY

摘要:

AbstractThe crystal structure determination of C‐calebassine iodide C40H48O2N4I2,nH2O has shown that the structure of the alkaloid ion is in agreement with formula Ia, proposed by P. KARRERet al.[3] (cf. structure formula). As the refinement is still going on, further details will be published in Z. Kris

ISSN:0018-019X    

DOI:10.1002/hlca.19650480206

出版商:WILEY‐VCH Verlag GmbH    

年代:1965

数据来源: WILEY

摘要:

AbstractThe crystal structure determination of cordeauxia‐quinone C14H12O7[1] (space groupP1) has settled the relative positions of the substituents at the naphthazarine skeleton. Furthermore, the bond lengths seem to favour the tautomeric form of formula IV. The acetyl and methoxyl groups deviate significantly from the planarity of naphthazarine; by intermolecular hydrogen bonds between hydroxyl and acetyl groups of adjacent molecules, infinite chains are forme

ISSN:0018-019X    

DOI:10.1002/hlca.19650480207

出版商:WILEY‐VCH Verlag GmbH    

年代:1965

数据来源: WILEY

摘要:

AbstractFrom chemical degradation experiments and spectroscopical data structure I is deduced for schizozygine, the major alkaloid ofSchizozygia caffaeoides(BOJ.) BAILL. The given relative configuration is suggested by experiments indicating a strain‐free ring syste

ISSN:0018-019X    

DOI:10.1002/hlca.19650480208

出版商:WILEY‐VCH Verlag GmbH    

年代:1965

数据来源: WILEY

摘要:

AbstractThe crystal structure determinations of two pyridinium salts of 1:2‐chromium complexes formed byo,o′‐dihydroxy‐trans‐azo molecules show that the structure of the anions corresponds to the DREW‐PFITZNERarrangement [2], as postulated by G. SCHETTY[1] for cases where the ligands form five‐ and six‐membered rings with the metal ion. The correct structure formulae are given (cf. formulae I and II); as the refinement of both structures is still going on, further details (such as bond lengths and bond angles) will be publis

ISSN:0018-019X    

DOI:10.1002/hlca.19650480209

出版商:WILEY‐VCH Verlag GmbH    

年代:1965

数据来源: WILEY

摘要:

AbstractDie Stammrinde und die Wurzelrinde einer in Costa Rica vorkommendenStrychnos‐Art,S. chloranthaPROG., wurden auf die in ihnen vorkommenden Alkaloide untersucht. Die Stammrinde enthielt nur verschiedene tertiäre Basen; zwei derselben wurden massenspektrometrisch identifiziert: Acetyldiabolin (= Diacetyl‐WIELAND‐GUMLICH‐Aldehyd) und Diabolin (N(a)‐Acetyl‐WIELAND‐GU

ISSN:0018-019X    

DOI:10.1002/hlca.19650480210

出版商:WILEY‐VCH Verlag GmbH    

年代:1965

数据来源: WILEY

摘要:

AbstractEs wurde an zylindrischen Probekörpern, hergestellt aus nichtporösen pulverigen Materialien unterschiedlicher Härte, die spezifische Permeabilität gemessen und mit der Porosität in Beziehung gebr

ISSN:0018-019X    

DOI:10.1002/hlca.19650480211

出版商:WILEY‐VCH Verlag GmbH    

年代:1965

数据来源: WILEY