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  • 1970-1974  (7)
  • 1970  (7)
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  • 1970-1974  (7)
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 103 (1970), S. 3242-3251 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Polar 1,4-Cycloaddition, IX. Cycloaddition of Amidomethylium Ions to Double Bond Systems. Scope and Course of the ReactionThe cycloaddition of the amidomethylium ions 2a-d to olefins leads in good yields to derivatives of 5.6-dihydro-4H-1.3-oxazine; the great versatility of this reaction is thus shown. The addition is cis-stereospecific and normally regiospecific. Further findings support the synchronous formation of the two new σ-bonds with 38 as transition state. The cycloaddition of amidomethylium ions may also be carried out by way of two „three component reactions“.
    Notes: Die Cycloaddition der Amidomethylium-Ionen 2a-d an Olefine führt in guten Ausbeuten cis-stereospezifisch und im allgemeinen richtungsspezifisch zu Derivaten des 5.6-Dihydro-4H-1.3-oxazins. Weitere Befunde sprechen für die synchrone Bildung der beiden neuen σ-Bin-dungen mit 38 als Übergangszustand. Die Cycloaddition kann außerdem in zweifacher Weise als Dreikomponenten-Reaktion durchgeführt werden. Dies zeigt die große Anwendungsbreite dieser neuartigen Diels-Alder-analogen Reaktion.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 103 (1970), S. 3783-3790 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Reactions of Acid Adducts of Pseudoisoindol-1-one and 2-AzaphenalenoneThe successful preparation of 3-chlorophthalimidine (8) allows the synthesis of the antiaromatic pseudoisoindol-1-one hydrohexachloroantimonate (4a). The corresponding aromatic 2-azaphenalenone hydroperchlorate (6) is prepared by treatment of pseudonaphthaldehydic acid amide 17 with aqueous perchloric acid. The electrophilicity of 4a and 6 towards nucleophilic carbon and nitrogen compounds is investigated.
    Notes: Die Synthese des 3-Chlor-phthalimidins (8) liefert einen bequemen Zugang zum antiaromatischen Pseudoisoindolon-(1)-hydrohexachloroantiomonat (4a). Das entsprechende aromatische 2-Aza-phenalenon-hydroperchlorat (6) kann bei der Einwirkung von wäßriger perchlorsäure auf das Pseudonaphthaldehydsäureamid 17 erhalten werden. Die Elektrophilie von 4a und 6 bzw. entsprechender Vorstufen gegenüber nucleophilen Kohlenstoff- und Stickstoffverbindungen wird untersucht.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 103 (1970), S. 1867-1871 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Structure of Inosine-5′-carboxylic Acid and DerivativesThe oxidation of 2′,3′-O-isopropylidene-inosine (1) with chromium(VI)-oxide in acetic acid leads in good yields and selectively to 2′,3′-O-isopropylidene-inosine-5′-carboxylic acid (2). 2 is transformed into the unprotected inosine-5′-carboxylic acid and into esters of 2 and 4. The conformation of the synthesized inosine derivatives is discussed.
    Notes: Die Oxydation von 2′.3′-O-Isopropyliden-inosin (1) mit Chrom(Vl)-oxid in Eisessig führt in guten Ausbeuten und selektiv zur 2′.3′-O-Isopropyliden-inosin-5′-carbonsäure (2). Aus 2 wird die ungeschützte Inosin-5′-carbonsäure (4) hergestellt, ferner wird die Synthese von Estern von 2 und 4 beschrieben. Die Konformation der hergestellten Inosin-Derivate wird diskutiert.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 103 (1970), S. 2760-2767 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 3-Azapyrylium Salts, VI. Alkylidene-1.3-oxazines and AlkylidenepyrimidinesThe alkyl substituted 3-azapyrylium salts 3a-c and the pyrimidinium salt 9a are transformed into the iso-π-electronic heteroanalogues of heptafulvene 4a-c and 10 (alkylidene-1.3-oxazines and alkylidenepyrimidines) by treatment with bases. Benzo-substituted heteroanalogues of heptafulvene 19a-d (alkylidene-1.3-benzoxazines) are available by the reaction of the alkyl o-hydrophenyl ketimines 17a and b with orthoesters.
    Notes: Die alkylsubstituierten 3-Aza-pyryliumsalze 3a-c und das Pyrimidiniumsalz 9 a wurden durch Einwirkung von Basen in die iso-π-elektronischen Heteroanalogen des Heptafulvens 4a-c und 10 (Alkyliden-1.3-oxazine und Alkyliden-pyrimidine) übergeführt. Benzo-substituierte Heteroanaloge des Heptafulvens 19a-d (Alkyliden-1.3-benzoxazine) sind durch Umsetzung der Alkyl-[o-hydroxy-phenyl]-ketimine 17a und b mit Orthoestern zugänglich.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 103 (1970), S. 3791-3793 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 3-(Formylmethylene)phthalimidine and DerivativesThe formylation of 3-methylenephathalimidine (4) according to a new Vilsmeier procedure yields the imonium salt 5 or the free 3-(formylmethylene)phthalimidine)(6). 5 and 6 undergo condensation reaction to give 7-10.
    Notes: Durch eine neuartige Vilsmeier-Formylierung kann das 3-Methylen-phthalimidin (4) in das Imoniumsalz 5 bzw. in das freie 3-Formylmethylen-phthalimidin (6) übergeführt werden. 5 und 6 liefern die Kondensationsprodukte 7-10.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 82 (1970), S. 322-323 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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