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  • Wiley-Blackwell  (17)
  • Wiley  (5)
  • American Physical Society  (3)
  • Nature Publishing Group  (1)
  • American Association for the Advancement of Science
  • 1995-1999
  • 1970-1974  (26)
  • 1950-1954
  • 1925-1929
  • 1971  (26)
Collection
Keywords
Publisher
Years
  • 1995-1999
  • 1970-1974  (26)
  • 1950-1954
  • 1925-1929
Year
  • 1
    Electronic Resource
    Electronic Resource
    Antigen-binding Small Lymphocytes in Delayed Hypersensitivity to Tuberculin (1971)
    [s.l.] : Nature Publishing Group
    Nature 231 (1971), S. 183-184 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Groups of four to six guinea-pigs were killed at intervals up to 28 days after primary immunization with 0. 1 ml. of BCG (Glaxo) in Freund's incomplete adjuvant (Difco) into each footpad. Half of each group of animals was skin-tested with 10 ug of purified protein derivative of mammalian tuberculin ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/231183a0
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  • 2
    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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  • 3
    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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  • 4
    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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  • 5
    Electronic Resource
    Electronic Resource
    Carbonylierungsreaktionen an Isocyanato- und Azido-Komplexen von Palladium(II) und Platin(II) (1971)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 2901-2907 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Carbonylation Reactions of Isocyanato- and Azidopalladium(II) and -platinum(II) ComplexesIsocyanato complexes (Ph3P)2M(NCO)2 (M = Pd, Pt) react with CO and alcohols (MeOH, EtOH) to give carbamic ester and alkoxycarbonyl complexes [(Ph3P)2M(NCO)(CO2R). The reaction of the azide and isocyanate bridged complexes [(Ph3P)2PtX2Pt(PPh3)2]2+[BF4-]2 (X= N3 NCO) with CO in CH2Cl2 yields [(Ph3P)2Pt(CO)(NCO)]+BF4-; this complex affords with CO and alcohol [(Ph3P)2Pt(CO)(CO2R)]+BF4-. Some reactions of the cation [(Ph3P)2Pt(CO)(CO2R)]+ are reported.
    Notes: Die Isocyanato-Komplexe (Ph3P)2M(NCO)2 (M = Pd, Pt) reagieren mit CO und Alkoholen (MeOH, ÄtOH) unter Bildung von Carbamidsäureester zu Alkoxycarbonyl-Verbindungen (Ph3P)2M(NCO)(CO2R) (R = Me, Åt). Bei der Umsetzung der azid- bzw. isocyanat verbrückten Komplexe [(Ph3P)2PtX2Pt(PPh3)2]2+[BF4-]2 (X = N3, NCO) mit CO entsteht [(Ph3P)2Pt(CO)(NCO)]+BF4-; dieser Komplex setzt sich mit CO und Alkohol zu [(Ph3P)2Pt(CO)(CO2R)]+BF4- um. Einige Reaktionen des Kations [(Ph3P)2Pt(CO)(CO2R)]+ werden beschrieben.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19711040932
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  • 6
    Electronic Resource
    Electronic Resource
    Übergangsmetall-Carben-Komplexe, XXXII Phenylalkoxycarben als Ligand in Cyclopentadienyl-carbonyl-nitrosyl-Komplexen des Chroms, Molybdäns und Wolframs (1971)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 3101-3107 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Carbene Complexes, XXXII Phenylalkoxycarbene as Ligand in Cyclopentadienylcarbonylnitrosyl Complexes of Chromium, Molybdenum and TungstenCyclopentadienyldicarbonylnitrosyl complexes of chromium, molybdenum and tungsten C5H5M(CO)2NO(M = Cr, Mo, W) (1a-c) add in ether one mole of phenyllithium. The formed acylmetallates are alkylated by oxonium tetrafluoroborates (4d, e) to the free carbene complexes. I.r., 1H n.m.r. and mass spectra of the stable, volatile, diamagnetic carbene complexes 5 show that the nucleophilic attack of LiC6H5 occurs only at one of the two CO-groups, and that the σ-donor/π-acceptor relationship of the different carbene ligands affects the remaining ligands bound to the central metal atom. When the complexes 5 are irradiated in the presence of iron pentacarbonyl the carbene ligand is transferred to give the corresponding (CO)4Fe-carbene complexes.
    Notes: Cyclopentadienyl-dicarbonyl-nitrosyle des Chroms, Molybdäns und Wolframs C5H5M(CO)2-NO (M = Cr, Mo, W) (1a-c) addieren in Äther äquimolare Mengen Phenyllithium. Die sich dabei bildenden Acylmetallate lassen sich durch Alkylierung mit Oxoniumtetrafluoroboraten (4d, e) zu den freien Carben-Komplexen umsetzen. IR-, 1H-NMR- und massenspektroskopische Untersuchungen der stabilen, sublimierbaren, diamagnetischen Carben-Komplexe 5 zeigen, daß der nucleophile Angriff von LiC6H5 nur an einer der beiden CO-Gruppen stattfindet und das σ-Donor/π-Akzeptor-Verhältnis der verschiedenen Carben-Liganden sich charakteristisch auf die übrigen am Zentralmetall gebundenen Liganden auswirkt. Durch Belichtung lassen sich die Carben-Liganden der Komplexe 5 auf Eisenpentacarbonyl unter Bildung der entsprechenden (CO)4Fe-carben-Komplexe übertragen.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19711041015
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  • 7
    Electronic Resource
    Electronic Resource
    Eigenschaften und IR-Spektrum der Knallsäure HCNO (1971)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 533-543 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Properties and Infrared Spectrum of Fulminic Acid, HCNOThe non-explosive fulminic acid is a considerably stronger acid than HCN (pKa ≦ 5;25°); its acid strength is similar to that of HN3. Infrared spectra of both HCNO and DCNO in the gas phase were determined: the assignment of the absorption bands is supported by the results of a normal coordinate analysis. The force constants for the linear formonitrile oxide H—C≡N—O are compared with those for related liner molecules, and the bonding in HCNO is discussed. The isosteric molecules HCNO and N2O have very similar valence force constants.
    Notes: Die nicht explosive Knallsäure ist eine wesentlich stärkere Säure als HCN (pKs ≦ 5;25°); ihre Säurestärke ist vergleichbar mit der von HN3. Die Infrarotspektren von gasförmigem HCNO und DCNO wurden aufgenommen; die Zuordnung der Absorptionen wird durch eine Normalkoordinatenanalyse gestützt. Die Kraftkonstanten des linearen Formonitriloxid-Moleküls H—C≡N—O werden mit denen ähnlicher Moleküle verglichen. Die isosteren Verbindungen HCNO und N2O zeigen sehr ähnliche Valenzkraftkonstanten.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19711040223
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  • 8
    Electronic Resource
    Electronic Resource
    Zur Reaktion von Azido-Metallverbindungen mit Isonitrilen: Tetrazolato-Komplexe mit Metall-Kohlenstoff-Bindung (1971)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 1816-1825 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reaction of Azidometal Compounds with Isocyanides: Tetrazolato Complexes with Metal-Carbon BondsThe azido complexes As(C6H5)4[Au(N3)4], As(C6H5)4[Au(N3)2], (C6H5)3PAuN3 and [(C6H5)3P]2M(N3)2 (M=Pd, Pt, Hg) react with isocyanides under very mild conditions to give the tetrazolato complexes As(C6H5)4[Au(CN4R)4] (R=CH3, i-C3H7, c-C6H11, CH2C6H5, C6H5, p-CH3O—C6H4), As(C6H5)4[Au(CN4CH3)2], CH3NCAuCN4CH3, (CH3NC)2Pt-(CN4CH3)2, [(C6H5)3P](RNC)M(CN4R)2 (M=Pd, Pt; R=c-C6H11, C6H5) and Hg(CN4CH3)2, respectively. 1H n.m.r. and i.r. spectra as well as acid hydrolysis yielding free 1-substituted tetrazole indicate that in these thermally and chemically stable compounds the tetrazolyl ligands are bonded via C-5 to the metal.
    Notes: Die Tetrazolato-Komplexe As(C6H5)4[Au(CN4R)4] (R=CH3, i-C3H7, c-C6H11, CH2C6H5, C6H5, p-CH3O—C6H4), As(C6H5)4[Au(CN4CH3)2], CH3NCAuCN4CH3, (CH3NC)2Pt- (CN4CH3)2, [(C6H5)3P](RNC)M(CN4R)2 (M=Pd, Pt; R=c-C6H11, C6H5) und Hg(CN4CH3)2 entstehen durch Umsetzung der Azidoverbindungen As(C6H5)4[Au(N3)4], As(C6H5)4[Au(N3)2], (C6H5)3PAuN3 und [(C6H5)3P]2M(N3)2 (M=Pd, Pt, Hg) mit Isonitrilen unter sehr milden Bedingungen (20°). 1H-NMR-und IR-Spektren sowie die Spaltung mit HCl, die zum freien 1-substituierten Tetrazol führt, beweisen das Vorliegen von Metall-Kohlenstoff-σ-gebundenen Tetrazolyl-Liganden in diesen thermisch und chemisch überraschend stabilen Komplexen.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19711040617
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  • 9
    Electronic Resource
    Electronic Resource
    Tooth replacement in the red-backed salamander, plethodon cinereusThis research was supported by grant GB 17112 from the National Science Foundation. (1971)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 134 (1971), S. 259-269 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The developmental cycle of the teeth in Plethodon cinereus is analyzed on morphological grounds using alizarin preparations. All the stages in development do not occupy the same proportion of the life cycle time. Functional teeth and germs at an early stage in development occupy a large proportion of the life cycle time, whereas the processes of tooth shedding and ankylosis occur very quickly. The time during which any locus does not bear a functional tooth, and is therefore a non-functional locus, is reduced to a minimum. P. cinereus has a basic pattern of tooth replacement which is consistent with Zahnreihen which are 2.0 tooth spaces apart. Variations in the replacement pattern are common and these are produced by relatively small fluctuations in the spacing of the Zahnreihen around the „mean„ of 2.0. Localized disturbances which produce breaks in the replacement pattern and cause waves to cross also occur. These may be due to the failure of tooth germs to develop, the fusion of tooth germs, or may be the result of the inherent variability in a complex biological system. This variability causes individual tooth germs to develop too slowly or too quickly and hence assume an „abnormal“ position thus causing breaks in the replacement pattern. Tooth replacement may be controlled by an intra-local mechanism(s) rather than by stimuli which travel along the jaw.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051340302
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  • 10
    Electronic Resource
    Electronic Resource
    Reaktionsmöglichkeiten in der organischen Elektrochemie (1971)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 83 (1971), S. 893-893 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19710832225
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