摘要:

AbstractCrystals of cadmiumbisthioglycolate are monoclinic,a= 10.06,b= 19.81,c= 8.74 Å, β=107.36°, space group P 21/c, Z = 4. A detailed three‐dimensional analysis shows that cadmium ions and mercaptide sulfur atoms form a two dimensional array of six‐membered and four‐membered rings (Fig. 1). All sulfur atoms bridge two cadmium ions. Of the two kinds of cadmium ions, one shows distorted tetrahedral coordination to four sulfurs, the other one distorted trigonal bipyramidal coordination (Fig. 4) to four sulfurs and to an axial alcohol oxy

ISSN:0018-019X    

DOI:10.1002/hlca.19740570302

出版商:WILEY‐VCH Verlag GmbH    

年代:1974

数据来源: WILEY

摘要:

AbstractX‐ray crystal structure analysis of three Pd(II) complexes withcis‐3,5‐diaminopiperidine (DAPI) shows that the metal ion has a square planar coordination. The DAPI groups aretransin the protonated and mixed complexes. Most surprisingly, the unprotonated complex has a basket‐like structure with the DAPI gr

ISSN:0018-019X    

DOI:10.1002/hlca.19740570303

出版商:WILEY‐VCH Verlag GmbH    

年代:1974

数据来源: WILEY

摘要:

AbstractIt is shown that there exists a fair correlation between the average number of ‘gauche’ conformations of normal and branched alkanes, and their volumes of mix

ISSN:0018-019X    

DOI:10.1002/hlca.19740570304

出版商:WILEY‐VCH Verlag GmbH    

年代:1974

数据来源: WILEY

摘要:

AbstractWe have studied the fragmentation of 1‐heptyl ions resulting from the loss of halogen from the corresponding halide ions. All positions had been labelled with D and13C, some positions even doubly labelled. The main processes are the loss of propene and, to a lesser extent, ethylene as neutral fragments. All carbon atoms have a definite probability of being lost with the olefin, those which are terminal having the smallest chance; this precludes an important contribution by direct scission. The source‐and the metastable‐decomposition produced much the same isotopic distribution in the fragments. The terminal hydrogen atoms also have a small chance of being rearranged, whereas those at non‐terminal positions show extensive scrambling. It seems that the fragmentation proceedsviacyclic structures which are rapidly attained and equilibrated amongst each other, but our results do not warrant suggestion of a detaile

ISSN:0018-019X    

DOI:10.1002/hlca.19740570305

出版商:WILEY‐VCH Verlag GmbH    

年代:1974

数据来源: WILEY

摘要:

AbstractThe constitution of Chlamydocin – a metabolite ofDiheterospora chlamydosporiawith pronounced cytostatic activity – is proposed on the basis of chemical reactions and physical data. The synthesis of a derivative of a new amino acid is described. The biological activities of this compound and of derivatives of Chlamydocin are discus

ISSN:0018-019X    

DOI:10.1002/hlca.19740570306

出版商:WILEY‐VCH Verlag GmbH    

年代:1974

数据来源: WILEY

摘要:

AbstractThe vertical ‘lone‐pair’ ionization potentialsIv(n) of fifteen 4‐substituted quinuclidines, of aza‐adamantane and of aza‐twistane have been determined by photoelectron spectroscopy. It is shown that the dependence ofIv(n) on the nature of the substituent S can be rationalized in terms of the contribution to the local potential at the ionization site (i.e.the nitrogen centre) by the dipole of S. Both the solution pK's andIv(n) correlate with classical substituent parameters (e. g.σ* orF) and with each other. However, no conclusions can be drawn from such regressions concerning a close relationship between the electronic mechanisms responsible for the observed changes

ISSN:0018-019X    

DOI:10.1002/hlca.19740570307

出版商:WILEY‐VCH Verlag GmbH    

年代:1974

数据来源: WILEY

摘要:

AbstractFour polyphenolheterosides have been isolated from the leaves ofHomogyne alpina, Petasites albus, Petasites hybridusandAdenostyles alliariaeby means of thin layer and column chromatography on polyamide. Isoquercitrine (II) has been isolated fromPetasites albus, Petasites hybridusandAdenostyles alliariae; Astragaline (III) fromPetasites albusandPetasites hybridus; Glucoluteoline (IV) fromAdenostyles alliariaeand Rutine (I) fromHomogyne alpina. Piceine (V) has also been isolated fromHomogyne alpina.

ISSN:0018-019X    

DOI:10.1002/hlca.19740570308

出版商:WILEY‐VCH Verlag GmbH    

年代:1974

数据来源: WILEY

摘要:

AbstractCyclisation (formation of derivatives of 2‐methylidene‐cyclopentanol or cyclohexanone) with inversion of configuration and retention of optical activity is observed during the solvolysis of secondary γ‐allenic tosylates.Steric factors rather than electronic ones control the participation of one of the double bonds in the allenic system. Kinetic results and product distribution are dis

ISSN:0018-019X    

DOI:10.1002/hlca.19740570309

出版商:WILEY‐VCH Verlag GmbH    

年代:1974

数据来源: WILEY

摘要:

AbstractAmmonolysis of nitroarginine‐containing peptides leads to the formation of ornithine‐containing side products. The structure of these side products has been deduced from model experiments. This side reaction can be avoided by using the NG‐tosyl or the NG‐dicarbobenzoxy protecting

ISSN:0018-019X    

DOI:10.1002/hlca.19740570310

出版商:WILEY‐VCH Verlag GmbH    

年代:1974

数据来源: WILEY

摘要:

AbstractStereo‐selective syntheses of 2,5,6‐trisubstituted perhydroisoindolines are achieved by preparation of the three diastereoisomeric 5,6‐epoxy‐perhydroisoindolines and their reactions with nucleophiles,e.g.amines. The transformation oftrans‐amino alcohols obtained in this way intocis‐amino alcohols i

ISSN:0018-019X    

DOI:10.1002/hlca.19740570311

出版商:WILEY‐VCH Verlag GmbH    

年代:1974

数据来源: WILEY