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  • Inorganic Chemistry  (111)
  • Polymer and Materials Science  (22)
  • Life and Medical Sciences  (16)
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  • 1995-1999  (63)
  • 1980-1984  (43)
  • 1970-1974  (41)
  • 1950-1954  (3)
  • 1930-1934  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Die Kristallstruktur von BaHg(CN)4 · 4 PyridinProfessor Walter Rüdorff zum 75. Geburtstage am 3. Oktober 1984 gewidmet (1984)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 516 (1984), S. 30-34 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystal Structure of BaHg(CN)4 · 4 PyridineThe structure of the tetragonal BaHg(CN)4 · 4 Pyridine (space group I4, a = 1119.4(7), c = 1 057.9(7) pm, Z = 2, dc = 1.87 g · cm-3) contains tetrahedral Hg(CN)4 and bisdisphenoide Ba(NC)4(py)4 groups, which are linked together by Hg—CN—Ba bridges. The BaHg(CN)4 framework consists of a 3-dimensional network of all round edge-sharing tetrahedrons. The analogous strontium compound is isotype with a = 1 108.2(9) and c = 1 035.3(14) pm.
    Notes: In der Struktur des tetragonalen BaHg(CN)4 · 4 Pyridin (Raumgruppe I4, a = 1119,4(7), c = 1 057,9(9) pm, Z = 2, dc = 1,87 g · cm-3) sind tetraedrische Hg(CN)4- und bisdisphenoide Ba(NC)4(py)4-Gruppen über Hg—CN—Ba-Brücken zu einem Raumnetz verknüpft. Dem BaHg(CN)4-Gerüst liegt ein Aufbau aus allseitig eckenverknüpften Tetraedern zugrunde. Die analoge Strontium-Verbindung ist isotyp mit a = 1 108,2(9) und c = 1 035,3(14) pm.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19845160905
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  • 2
    Electronic Resource
    Electronic Resource
    Structure-activity relationships of neuropeptide Y analogues with respect to Y1 and Y2 receptors (1995)
    New York : Wiley-Blackwell
    Biopolymers 37 (1995), S. 123-142 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Secondary structure investigations, affinities, and activities of neuropeptide Y analogues with respect to the Y1 and the Y2 receptor are reviewed. The results are discussed with respect to the different prerequisites for affinities to both receptor subtypes. The results from a systematic scanning of the hormone using L-alanine and from a large variety of discontinuous and cyclic analogs suggest that two different conformations of neuropeptide Y are adopted at the Y1 and Y2 receptors. Whereas a C-terminal turn structure is suggested for Y1 receptor affinity, an α-helical conformation of the C-terminus is afforded for good binding to the Y2 receptor. © 1994 John Wiley & Sons, Inc.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360370207
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  • 3
    Electronic Resource
    Electronic Resource
    A new approach to secondary structure evaluation: Secondary structure prediction of porcine adenylate kinase and yeast guanylate kinase by CD spectroscopy of overlapping synthetic peptide segments (1997)
    New York : Wiley-Blackwell
    Biopolymers 41 (1997), S. 213-231 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A new approach for evaluating the secondary structure of proteins by CD spectroscopy of overlapping peptide segments is applied to porcine adenylate kinase (AK1) and yeast guanylate kinase (GK3).One hundred seventy-six peptide segments of a length of 15 residues, overlapping by 13 residues and covering the complete sequences of AK1 and GK3, were synthesized in order to evaluate their secondary structure composition by CD spectroscopy.The peptides were prepared by solid phase multiple peptide synthesis method using the 9-fluorenylmethoxycarbonyl/tert-butyl strategy. The individual peptide secondary structures were studied with CD spectroscopy in a mixture of 30% trifluoroethanol in phosphate buffer (pH 7) and subsequently compared with x-ray data of AK1 and GK3.Peptide segments that cover α-helical regions of the AK1 or GK3 sequence mainly showed CD spectra with increasing and decreasing Cotton effects that were typical for appearing and disappearing α-helical structures. For segments with dominating β-sheet conformation, however, the application of this method is limited due to the stability and clustering of β-sheet segments in solution and due to the difficult interpretation of random-coiled superimposed β-sheet CD signals.Nevertheless, the results of this method especially for α-helical segments are very impressive. All α-helical and 71% of the β-sheet containing regions of the AK1 and GK3 could be identified. Moreover, it was shown that CD spectra of consecutive peptide content reveal the appearance and disappearance of α-helical secondary structure elements and help localizing them on the sequence string. © 1997 John Wiley & Sons, Inc. Biopoly 41: 213-231, 1997
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Nonactinsäure-Diastereomere und 2-Desmethyl-nonactinsäure-Epimere (1971)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 21-30 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Diastereomers of Nonactin Acid and Epimers of 2-Desmethylnonactin AcidNonactin acid 8a was prepared in only four reaction steps starting from the furan 3a. - In an attempt to prepare nonactin acid by intramolecular cyclisation of 13, the tetrahydropyran 15 was obtained in addition to the desired tetrahydrofuran 14. Treatment of 14 + 15 with sodium cyanide under the conditions of the Kolbe reaction led to the formation of the isomeric acids 16 + 17.
    Notes: Ausgehend von dem Furan 3a gelangt man in vier Reaktionsschritten zur Nonactinsäure 8a, einem 2.5-disubstituierten Tetrahydrofuran. - Beim Versuch der Darstellung von Nonactinsäure durch intramolekulare Cyclisierung von 13 entstand neben dem gewünschten Tetrahydrofuran 14 durch Ringerweiterung auch das Tetrahydropyran 15. Die Umwandlung von 14 + 15 mit Natriumcyanid nach Kolbe führte zu den stellungsisomeren Säuren 16 + 17.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19711040105
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  • 5
    Electronic Resource
    Electronic Resource
    Ein einfacher Weg zu azidverbrückten Palladium- und Platin(II)-Komplexen (1971)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 528-532 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A Simple Pathway to Azide-Bridged Palladium and Platinum(II) ComplexesSalts of azide-bridged dimeric cations are prepared in quantitative yields by reaction of the monomeric diazido complexes (Ph3P)2 M(N3)2 with nitrosyl- or triethyloxonium salts, and diethyl sulfate, respectively.
    Notes: Salze der azidverbrückten dimeren Kationen entstehen in praktisch quantitativer Ausbeute durch Umsetzung der monomeren Diazidokomplexe (Ph3P)2 M(N3)2 mit Nitrosyl- oder Triäthyloxonium-Salzen bzw. mit Diäthylsulfat.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19711040222
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  • 6
    Electronic Resource
    Electronic Resource
    Orthoamide, XX. Umsetzungen von Amidacetalen und Bis-dimethylamino-methoxy-methan (Aminalester) mit Benzaziden (1971)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 3794-3803 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Orthoamides, XX. Reactions of Amide Acetals and Bis(dimethylamino)-methoxymethane (Aminal Ester) with Benzoic AzidesUpon thermal reaction of amide acetals (1) with benzoic azides (2) only products are obtained arising from secondary reactions of the phenyl isocyanates formed intermediately from the azides. In the photochemical reaction, acyl hydrazines 15 may be isolated formed via acyl nitrene intermediates.
    Notes: Bei der thermischen Umsetzung von Amidacetalen (1) mit Benzaziden (2) werden lediglich die Folgeprodukte der intermediär aus den Aziden gebildeten Phenylisocyanate erhalten. Hingegen gelingt es bei der photochemischen Reaktion die Folgeprodukte intermediär gebildeter Acylnitrene, die Acylhydrazine 15, zu isolieren.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19711041209
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  • 7
    Electronic Resource
    Electronic Resource
    Herstellung von Polyalkylmercapto- und Polyarylmercapto-methanen, -äthanen und -äthylenen aus metallierten Orthotrithioameisensäureestern (1972)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 105 (1972), S. 3280-3300 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation of Polyalkylthio- and Polyarylthiomethanes, -ethanes and -ethylenes from Metalated OrthotrithioformatesAliphatic, cycloaliphatic, and aromatic thioles are converted to orthotrithioesters in good yields by treatment with trimethyl orthoformate in the presence of Lewis acids; open chain, monocyclic and bicyclic derivatives 4a-s and 8 are prepared. Methods for the unambiguous synthesis of tristhiomethanes with two different RS-groups are described. Metalated orthotrithioformates 1 are obtained form 4 and n-butyllithium in THF at -70° as shown by quantitative isolation of the 1.1.1-tristhioethanes 5 after reaction with iodomethane. The organometallic compounds 1 decompose to give tetrakisthioethylenes 6. Decomposition takes place, thermally“ between -50 and -20° in the case of open chain alkyl derivatives 1 while the aryl analogs must be, decomposed“ with cyclohexene epoxide. The tetrakisthiomethanes 7, 9, 17, 18 and 19 are prepared form metalated formaldehyde dithioacetals or orthotrithioformates and disulfides.
    Notes: Aliphatische, cycloaliphatische und aromatische Thiole liefern in Gegenwart von Lewis-Säure mit Orthoameisensäure-trimethylester in guten Ausbeuten die offenkettigen, monocyclischen und bicyclischen Trithioester 4a-s und 8. Methoden zur gezielten Herstellung von Derivaten mit zwei verschiedenen RS-Gruppen werden beschrieben. Die Orthotrithioester werden bei -70° in THF durch Butyllithium quantitativ zu 1 metalliert. Aus den Metallderivaten 1 und Methyljodid entstehen die 1.1.1-Tris-mercapto-äthane 5. Zerfall von 1 liefert die Tetrakis-mercapto-äthylene 6; die alkylsubstituierten Verbindungen 1 zerfallen schon bei Temperaturen zwischen -50 und -20°; um Tetrakis-arylmercapto-äthylene herzustellen, muß man die entsprechenden Verbindungen 1 mit Cyclohexenoxid, zersetzen“. Thiolierungen von metallierten Formaldehyd-dithioacetalen und Orthotrithioameisensäureestern mit Disulfiden führen zu den Tetrakis-mercapto-methanen 7, 9, 17, 18 und 19.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19721051015
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  • 8
    Electronic Resource
    Electronic Resource
    ESR-Spektroskopischer Beweis für die C-C-Dissoziation von Hexakis(organylthio)äthanen und die S-C-Dissoziation von Tetrakis(organylthio)methanen. Tris(organylthio)methyl-Radikale (1972)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 105 (1972), S. 3905-3914 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: E.S.R. Spectroscopic Proof for the C-C Dissociation of Hexakis(organylthio)ethanes and the S-C Dissociation of Tetrakis(organylthio)methanes. Tris(organylthio)methyl RadicalsUnstable tris(arylthio)methyls of type 2 are generated by heating hexakis(arylthio)ethanes such as 1 (100°) and tetrakis(arylthio)methanes such as 3 (140°). The identity of these radicals is confirmed by e.s.r. spectroscopy. The singlet signal observed for 2 is split to a 43.7 Gauss doublet in the 13C-labelled radical; partial replacement of the sulfur atoms by 33S causes the expected HFS-splitting by three sulfur nuclei (a(33S) == 4.2 Gauss). In the pyrolysis of the „mixed“ thioorthocarbonate 7 and of thioorthooxalate 9 the methylthiobis(phenylthio)-methyl (8) is observed as a quartet with a(CH3) == 2.1 Gauss. According to these data, the radical electron density is highest at the central carbon atom of 2. The easy homolysis of the bonds in 1 and 3 is therefore a consequence of steric hindrance in the dimer and in the methane rather than of resonance stabilization in the radical. This conclusion is substantiated by the fact that the ethanes bearing o-tolylthio or cyclohexylthio groups dissociate at lower temperatures.
    Notes: Beim Erhitzen von Hexakis(arylthio)äthanen wie 1 (100°) und von Tetrakis(arylthio)methanen wie 3 (140°) treten instabile Tris(arylthio)methyle vom Typ 2 auf, deren Identität ESR-spektroskopisch gesichert wurde. Das Singulett-Signal von 2 wird nach 13C-Markierung am Methylkohlenstoff in ein Dublett (43.7-Gauss) aufgespalten; im Spektrum des 33S-markierten 2 treten die erwarteten Aufspaltungen durch drei Schwefelkerne ein (a(33S) == 4.2 Gauss). Bei der Pyrolyse des „gemischten“ Orthokohlensäureesters 7 bzw. des entsprechenden Äthans 9 beobachtet man das Signal des Methylthiobis(phenylthio)methyls (8), das eine Methyl-Quartettaufspaltung a(CH3) von 2.1 Gauss zeigt. Nach den gemessenen Parametern ist das ungepaarte Elektron überwiegend am zentralen Kohlenstoff von 2 lokalisiert. Für die leichte Homolyse der Bindungen in 1 und 3 ist somit sterische Hinderung im nicht dissoziierten Molekül und nicht Mesomerie-Stabilisierung der Radikale verantwortlich zu machen. Hierfür sprechen auch die Ergebnisse an entsprechenden Äthanen mit sterisch anspruchsvolleren Substituenten.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19721051218
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  • 9
    Electronic Resource
    Electronic Resource
    Neue d-Übergangsmetallkomplexe mit Azidbrücken (1972)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 105 (1972), S. 3209-3214 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: New Azide Bridged d-Transition Metal ComplexesThe azide bridged cations [(diphos)Ni(N3)2Ni(diphos)]2+, [Ph3P)2(CO)MN3M(CO)(PPh3)2]+ are obtained from the monomeric azido complexes (diphos)Ni(N3)2 and (Ph3P)2M(CO)N3 (M = Rh, Ir) respectively with nitrosyl and triethyloxonium salts. In the rhodium- and iridium(I)compounds, accessible also from (Ph3P)2M(CO)N3 and [(Ph3P)2M(CO)(NH2CO2Et)]+ BF4-, two transition metal atoms are bridged by only one azide ligand.
    Notes: Die azidverbrückten Kationen [(diphos)Ni(N3)2Ni(diphos)]2+, [Ph3P)2(CO)MN3M(CO)-(PPh3)2]+werden aus den monomeren Azido-Komplexen(diphos)Ni(N3) 2bzw.(Ph3P)2M(CO)N3 (M = Rh, Ir) mit Nitrosyl- oder Triäthyloxoniumsalzen erhalten. In den Rhodium- und Iridium(I)-Verbindungen, die auch aus (Ph3P)2M(CO)N3 und [(Ph3P)2M(CO)(NH2CO2Ät)]+ BF4- zugänglich sind, werden zwei Übergangsmetallatome nur über eine N3-Gruppe verbunden.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19721051009
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  • 10
    Electronic Resource
    Electronic Resource
    Einfache Darstellung von Hexakis(organylthio)äthanen Pyrolyse von Hexakis(arylthio)äthanen Hinweise auf eine C—C-Dissoziation (1972)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 105 (1972), S. 3892-3904 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Simple Preparation of Hexakis(organylthio)ethanes Pyrolysis of Hexakis(arylthio)ethanes Indications of a C—C DissociationCoupling of tris(arylthio)- and tris(alkylthio)methyllithium derivatives with iodine leads to hexakis(organylthio)ethanes 7-10. In the pyrolysis of the phenyl derivative 7a above 100° with or without solvents decomposition takes place to give the following products: diphenyl disulfide (11a), phenyl dithiobenzoate (12a), tris(phenylthio)methane (13a), tetrakis(phenylthio)ethylene (14a), and tetrakis(phenylthio)methane (15a). The methanes 15 yield the same types of compounds 11-14 when heated at temperatures ranging from 165 to 230°. Formation of the ethylene 14a from the ethane 7a is proved by 13C-labelling to be preceded by C-C-bond dissociation of the latter compound. All results are readily explained by assuming that the initial reaction step is the homolysis of the C-C bond in the ethanes 7 and of the ArS-C bond in the methanes 15 to give tris(arylthio)methyls.
    Notes: Kupplung von Tris(arylthio)- und Tris(alkylthio)methyllithium-Verbindungen 6 mit Jod führt zu Hexakis(organylthio)äthanen 7-10. Beim Erhitzen des Phenylderivates 7a tritt oberhalb von 100° in verschiedenen Lösungsmitteln Zersetzung zu Diphenyldisulfid (11a), Dithiobenzoesäure-phenylester (12a), Tris(phenylthio)methan (13a), Tetrakis(phenylthio)-äthylen (14a) und Tetrakis(phenylthio)methan (15a) ein. Auch 15a liefert bei höherer Temperatur diese Produkte. Durch 13C-Markierung wird bewiesen, daß der Bildung des Äthylens 14a aus dem Äthan 7a eine C-C-Dissoziation vorausgeht. Alle Befunde lassen sich damit erklären, daß die Äthane 7 unter C-C-, die Methane 15 unter ArS-C-Dissoziation zunächst Tris(arylthio)methyl-Radikale liefern.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19721051217
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