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  • Inorganic Chemistry  (226)
  • 1995-1999  (49)
  • 1985-1989  (74)
  • 1975-1979  (91)
  • 1950-1954  (12)
  • 1
    Electronic Resource
    Electronic Resource
    Synthesis and Crystal Structure of tert-Butylamino)di-tert-butyl)siliceniotrichloroaluminate, (Me3C)2Si=NCMe3·AlCl3, and Dimethylazomethine-Aluminium Trichloride, Me2C=NH·AlCl3Dedicated to Prof. A. Meller on the occasion of his 65th birthday. (1997)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 130 (1997), S. 753-755 
    Details
    ISSN: 0009-2940
    Keywords: Silicenium ion ; Iminosilane ; Aluminate ; Silicon ; Aluminium ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Lithiated text-butylaminolfluorosilanes react with aluminum trichloride in ether, eliminating LiF to give AlCl3 adducts of iminosilanes  -  aminosiliceniotrichloroaluminates {R2Si-NCMe3·AlCl3}, which thermally form the dimethylazomethine- aluminium trichloride, Me2C=NH·AlCl3.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19971300613
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  • 2
    Electronic Resource
    Electronic Resource
    Lichtreaktionen mit Carbonsäurederivaten, IX. Abfangversuche mit photochemisch erzeugtem monoatomarem und diatomarem Schwefel. Schwefeladdition an 1,2-Dimethylencyclohexan. - Synthese von 1,4,5,6,7,8-Hexahydrobenzo[d][1,2]dithiin und 1,3,4,5,6,7-Hexahydrobenzo[c]thiophen (1975)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 630-639 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Photoreactions with Carbonic Acid Derivatives, IX. Experiments on the Capture of Photochemically Produced Monoatomic and diatomic sulfur-Sulfur Addition on 1,2-Dimethylenecyclohexane.-Synthesis of 1,4,5,6,7,8-Hexahydrobenzo-[d][1,2]dithiin and 1,3,5,6,7-Hexahydrobenzo[c]thiopheneIn addition to cis- and trans-2,3-diethoxy-2-butene (3) small amounts of 2,3-diethoxy-1-butene (6), 2,3-diethoxy-1,3-butadiene (7) and 1-ethoxy-1-ethanethiol (5) were found in the irradiation product of O-ethyl thioacetate. The produced sulfur adds to a slight extent to 1,2-Dimethylenecyclohexane giving 1,4,5,6,7,8-hexahydrobenzo[d][1,2]dithiin (8), 1,3,4,5,6,7-hexahydrobenzo-[c]thiophene (9) and 4,5,6,7-tetrahydrobenzo[c]thiophene (10). For definite identification of the reaction products 8, 9 and 10 were synthesized.
    Notes: Im Bestrahlungsprodukt von Thionessigsäure-äthylester (1) wurden neben cis- und trans-2,3-Diäthoxy-2-buten (3) in geringen Mengen noch 2,3-Diäthoxy-1-buten (6); 2,3-Diäthoxy-1,3-butadien (7) und α-Mercaptodiäthyläther (5) nachgewiesen. - Der gebildete Schwefel addiert sich in geringem Ausmaß an 1,2-Dimethylencyclohexan unter Bildung von 1,4,5,6,7,8-Hexahydrobenzo[d][1,2]dithiin (8), 1,3,4,5,6,7-Hexahydrobenzo[c]thiophen (9) und 4,5,6,7-Tetrahydrobenzo[c]thiophen (10). Zur sicheren Identifizierung der Reaktionsprodukte wurden 8, 9 und 10 synthetisiert.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19751080229
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  • 3
    Electronic Resource
    Electronic Resource
    Über Aminosäuren und Peptide, XV. Hydroxylsubstituierte Cyclodipeptide durch Ringschluß von Pyruvoylaminosäureamiden, II Zweifacher Ringschluß (1975)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 2907-2916 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Amino Acids and Peptides, XV. Formation of hydroxycyclodipeptides by Cyclization of Pyruvoyl Amino Acids, II. Double Cyclization2-Oxo-5-(pyruvoylamino)valeric methylamide (15) is synthesized via the compounds 10-14. 15 is stable in cristalline form and in chloroform solution, but affords the dihydroxycyclodipeptide 16 in dilute HCl solution by a double cyclization reaction. Further reaction with H2S/ZnCl2 and subsequent dehydrogenation yield the epidithio-cyclodipeptide 17. 1,2-Dehydroproline methylamide (23) is obtained by reaction of 5-azido-2-oxovaleric methylamide (22) with triphenylphosphine.
    Notes: 2-Oxo-5-(pyruvoylamino)valerian-methylamid (15) wird über die Stufen 10-14 aufgebaut. 15, in kristallinem Zustand und in Chloroformlösung stabil, bildet in verdünnter Chlorwasserstoffsäure durch zweifachen Ringschluß das Dihydroxy-cyclodipeptid 16. Reaktion mit H2S/ZnCl2 und folgende Dehydrierung führen von 16 zur Epidithioverbindung 17. 5-Azido2-oxovalerian-methylamid (22) wird mit Hilfe von Triphenylphosphin in 1,2-Dehydroprolinmethylamid (23) umgewandelt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19751080910
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  • 4
    Electronic Resource
    Electronic Resource
    Über Aminosäuren und Peptide, XVI. Über Dehydroaminosäuren, III. Additionen an α-Iminocarbonsäuren (1975)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 2917-2922 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Amino Acids and Peptides, XVI. On Dehydroamino Acids, III. Addition Reaction to α-iminocarboxylic AcidsAddition reactions to dehydroproline methyl ester (1) and dehydroproline methylamide (2) are described as examples for additions to α-iminocarboxylic acid derivatives. The addition products of carbonylchlorides (e. g. 6 and 7) are synthetically important as they allow to synthesize α-alkoxy-α-acylaminocarboxylic acids (10), α-acetylthio-α-acylaminocarboxylic acids (11), and α-acylamino-α,β-dehydrocarboxylic acids (12 and 13). The addition products of α-substituted carbonyl chlorides such as α-bromopropionyl chloride and pyruvoyl chloride to dehydroproline compounds (e. g. 14 and 17) lead to cyclodipeptides with α-alkoxy and α-mercapto functions (15, 16, 18, 19).
    Notes: Als Beispiele für Anlagerungsreaktionen an α-Iminocarbonsäurederivate werden Additionsreaktionen an Dehydroprolin-methylester (1) und Dehydroprolin-methylamid (2) beschrieben. Synthetisch wertvoll sind die Anlagerungsprodukte von Carbonsäurechloriden (z. B. 6 und 7), von denen Wege zu α-Alkoxy-α-acylaminocarbonsäuren (10), α-Acetylthio-α-acylaminocarbonsäuren (11) und α-Acylamino-α,β-dehydrocarbonsäuren (12 und 13) führen. Die Additionsprodukte α-substituierter Carbonsäurechloride wie α-Brompropionylchlorid und Pyruvoylchlorid an die Dehydroprolinverbindungen (z. B. 14 und 17) führen zu Cyclodipeptiden mit α-Alkoxy- und α-Mercaptofunktionen (15, 16, 18, 19).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19751080911
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  • 5
    Electronic Resource
    Electronic Resource
    [1,5]-Sigmatrope Esterverschiebung am Pentakis (methoxycarbonyl)cyclopentadien-System (1976)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 1918-1927 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: [1,5]-Sigmatropic Ester Shift in the Pentakis(methoxycarbonyl)cyclopentadiene System5-Alkyl-pentakis(methoxycarbonyl)cyclopentadienes (1) equilibrate at 100°C with 1-alkyl-pentakis(methoxycarbonyl)cyclopentadienes (2) via 1,5-sigmatropic ester shifts. At higher temperatures a further ester shift generates the 2-alkyl-pentakis(methoxycarbonyl)cyclopentadienes (3). The intramolecular character of the rearrangement is demonstrated by crossover experiments.
    Notes: 5-Alkyl-pentakis(methoxycarbonyl)cyclopentadiene (1) äquilibrieren bei 100°C durch [1,5]-sigmatrope Esterverschiebung mit 1-Alkyl-pentakis(methoxycarbonyl)cyclopentadienen (2). Bei höheren Temperaturen führt eine weitere Esterverschiebung zu 2-Alkyl-pentakis(methoxycarbonyl)cyclopentadienen (3). Der intramolekular Verlauf der Umlagerung wurde durch Kreuzungsversuche gesichert.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19761090533
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  • 6
    Electronic Resource
    Electronic Resource
    Über Aminosäuren und Peptide, XVII. über Dehydroaminosäuren, IV. Ringschlüsse an Dehydropeptiden (1977)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 110 (1977), S. 921-941 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Amino Acids and Peptides, XVII. On Dehydroamino Acids, IV. Ring Closure of DehydropeptidesSix- or five-membered cyclic compounds (amino-piperazinediones: 2, 14-19, 21, 24, or imidazolidinones 28, 29) are obtained under basic conditions from dehydropeptides by α-addition of an amide function to the acylaminoacrylic unit. Sterical conditions, scope, and limitations of this cyclisation have been investigated up to the dehydrotetrapeptide amide 20. Formation of six-membered rings is preferred. Five-membered rings only result, if reaction to six-membered rings is excluded either by the structure of the dehydropeptide (no NH-function available) or by its conformation (s-trans amide function). Ring closure to the cyclodipeptides 2a, 14, 15, 18, 19, 21, and 24 proceeds stereoselectively.
    Notes: Dehydropeptide bilden in alkalischer Lösung durch α-Addition einer Amidgruppe an das Acylaminoacrylsäuresystem sechs- oder fünfgliedrige Ringe (Amino-piperazindione: 2, 14-19, 21, 24 bzw. Imidazolidinone: 28, 29). Reaktionsbedingungen, räumlicher Ablauf und Grenzen der Cyclisierung wurden bis zum Ringschluß des Dehydrotetrapeptidamids 20 untersucht. Der Sechsring wird bevorzugt. Ein Fünfring bildet sich nur dann, wenn die Cycloaddition zum Sechsring infolge der Struktur (keine NH-Funktion zur Addition) oder der Konformation (s-trans-Fixierung einer Amidbindung) des Dehydropeptids nicht möglich ist. Der Ringschluß zu den Cyclodipeptiden 2a, 14, 15, 18, 19, 21 und 24 verläuft stereoselektiv.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19771100312
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  • 7
    Electronic Resource
    Electronic Resource
    Bemerkungen zur „Three-step Synthesis of a Gliotoxin Analogue⃛“ von H. C. J. Ottenheijm et al. (1977)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 110 (1977), S. 3722-3723 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19771101128
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  • 8
    Electronic Resource
    Electronic Resource
    Über Aminosäuren und Peptide, XXIV: Radikalisch und photochemisch initiierte Oxidation von Aminosäurederivaten (1978)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 111 (1978), S. 361-366 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Amino Acids and Peptides, XXIV: Radically and Photochemically Initiated Oxidation of Amino Acid DerivativesIn an atmosphere of oxygen cyclic peptides are photochemically oxidized to mono- and bishydroperoxides (1, 2, 4, 6, 8, 10, 11) in the presence of benzophenone as catalyst. The same products are also formed using radical initiators.
    Notes: Cyclopeptide werden in einer Sauerstoffatmosphäre photochemisch-radikalisch unter Benzophenon-Katalyse zu Mono- und Bishydroperoxiden (1, 2, 4, 6, 8, 10, 11) oxidiert. Die gleichen Produkte entstehen auch bei der Oxidation mit Hilfe von Radikalstartern.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19781110134
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  • 9
    Electronic Resource
    Electronic Resource
    Photoelektronenspektren und MNDO-Rechnungen für [n]Paracyclophane (1978)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 111 (1978), S. 1958-1961 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Photoelectron Spectra and MNDO-Calculations for [n]ParacyclophanesThe observed splittings of the first two photoelectron bands and the calculated strain energies of the [n]paracyclophanes are discussed; a simple model suggests that they are mainly due to the deformation of the benzene ring. Energetic considerations lead to the conclusion that the “aromatic character” of the benzene moiety in the [n]paracyclophanes has been lost to a large extent for n = 6, and completely for n = 5.
    Notes: Die beobachteten Aufspaltungen der beiden ersten Photoelektronenbanden und die berechneten Spannungsenergien der [n]Paracyclophane werden diskutiert und in einem einfachen Modell vorwiegend auf die Deformation des Benzolrings zurückgeführt. Energetische Überlegungen führen zu dem Schluß, daß der „aromatische Charakter“ der Benzoleinheit in den [n]Paracyclophanen bei n = 6 weitgehend und bei = 5 vollständig verlorengegangen ist.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19781110529
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  • 10
    Electronic Resource
    Electronic Resource
    Heterocyclische 8π-Systeme, 5. 1,3-Thiazin-Anionen (1975)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 6-16 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Heterocyclic 8π-Systems, 51,3-Thiazine anions 11 are energy rich, heterocyclic 8π electron systems. They are generated by base treatment of 2H-, 4H-, and 6H-1,3-thiazines 8-10 at low temperatures. Like the analogous thiepines, they readily undergo elimination of sulfur to form pyrrole anions 15. Sulfur elimination is promoted by an excess of base. These reactions and the product distribution received by deuteration of the thiazine anions are discussed.
    Notes: 1,3-Thiazin-Anionen 11 sind energiereiche heterocyclische 8π-Elektronensysteme. sie können ausgehend von 2H-, 4H- und 6H- 1,3-Thiazinen 8-10 durch Einwirkung von starken Basen bei tiefen Temperaturen erzeugt werden, sie lagern sich jedoch wie die Thiepine unter Abspaltung von Schwefel rasch in Pyrrol-Anionen 15 um. Die Schwefelabspaltung wird durch einen Überschuß an Base gefördert. Diese Reaktionen und die Produktverteilung bei der Deuterierung der Thiazin-Anionen werden diskutiert.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19751080103
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