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  • 1
    Electronic Resource
    Electronic Resource
    Halogenierte Pyridine und 1,8-Naphthyridine. VI (1977)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 60 (1977), S. 907-921 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Halogenated pyridines and 1,8-naphthyridines. VI.The principle of the synthesis of 3-halomethyl-2,6-dichloro-pyridines has been extended to compounds with side chains of more than one carbon atom in the 3-position. Feasible synthetic routes are outlined starting from cheap, commercially available α-methylideneglutaronitrile and trichloroalkyl functional compounds which yield the intermediate 1,3,5-trisubstituted alkanes. These are cyclized by aqueous mineral acid or by hydrogen bromide in an organic solvent to 2-substituted glutarimids or hexahydronaphthyridinones, depending on the mode of cyclization. The final aromatization provides a simple route to pyridines or 1, 8-naphthyridines.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19770600321
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  • 2
    Electronic Resource
    Electronic Resource
    Eine einfache Methode zur Herstellung von Benzoxazolen (1980)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 63 (1980), S. 413-419 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A Facile Method for the Synthesis of BenzoxazolesThe preparation of benzoxazoles by a facile one-pot reaction is reported. The reaction of carboxylic acids with 2-chloro-N-methyl-Δ1-pyrrolinium chloride in an excess of N-methyl-2-pyrrolidone afforded carboxylic acid chlorides which were converted subsequently to their 2-hydroxyanilides by addition of 2-aminophenols. Cyclization of the 2-hydroxy-anilides at elevated temperatures furnished the benzoxazoles in high yield and purity.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19800630212
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  • 3
    Electronic Resource
    Electronic Resource
    A New Generation of 6,6′-Disubstituted 2,2′-Bipyridines: Towards Novel Oligo(bipyridine) Building Blocks for Potential Applications in Materials Science and Supramolecular Chemistry (1998)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1998 (1998), S. 2573-2581 
    Details
    ISSN: 1434-193X
    Keywords: Oligo(bipyridines) ; Supramolecular chemistry ; Functionalized bipyridines ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 6,6′-disubstituted 2,2′-bipyridines and oligo(bipyridines) are often used as ligands in supramolecular chemistry; however, their range of application has been limited due to the lack of unsymmetrically functionalized compounds and their poor solubility. We describe herein a new generation of specially designed unsymmetrical bipyridine building blocks possessing different protecting groups for the hydroxy functionality and reasonable solubility behavior. These molecules permit the synthesis of a wide range of functionalized oligo(bipyridines) with new potential applications in supramolecular chemistry and materials science. As initial examples, we present the synthesis of mono- and bis-functionalized bis- and tris-2,2′-biypridines.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 4
    Electronic Resource
    Electronic Resource
    Rhodium-Katalysierte Isomerisierungen von 2-Methylidenglutarsäureestern zu Methylglutaconsäureestern (1974)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 57 (1974), S. 856-863 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The Rhodium(III)-catalyzed thermal isomerization of 2-methylidenglutaric acid esters affords predominantly mixtures of cis/trans-2-methylglutaconic acid esters (2, 3) which upon slow distillation isomerize completely into the cis-esters (2). Saponification of 2 yields trans-2-methylglutaconic acid (5). Attempts to prepare the acid chloride of 5 produces 6-chloro-5-methylpyrone-2 (9) or 6-chloro-3-methylpyrone-2 (10) which react with anilines to N-substituted derivatives of trans-4-methylglutaconic acid amides (11). The thermal isomerizations of the respective esters are discussed in terms of 1,5-hydrogen shifts in their ester enol structures.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19740570343
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  • 5
    Electronic Resource
    Electronic Resource
    Heteronuklear überbrückte tricyclische Systeme. Oxa-brexane- und -brendane (1975)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 58 (1975), S. 1345-1357 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Unsaturated cyclic and bicyclic hydrocarbons react with chloral in presence of aluminium chloride to yield tricyclic oxabrexanes which undergo acid catalyzed rearrangements to oxabrendanes. 1,5-cyclooctadiene gives the new oxa-cyclo[c, d]octahydropentalen. Structural evaluations and stereochemical assignments are discussed on the basis of detailed 1H- and 13C-NMR.-spectra.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19750580513
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  • 6
    Electronic Resource
    Electronic Resource
    Halogenierte Pyridine III. Di- und trihalogenierte Pyridin-3-aldehyde (1976)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 59 (1976), S. 211-221 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Halogenated pyridines III. Di- and trihalogenated pyridine-3-aldehydes.Three methods for the preparation of new ring chlorinated pyridine-3-aldehydes are investigated. Reactions of the new aldehydes are reported.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19760590123
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  • 7
    Electronic Resource
    Electronic Resource
    Halogenierte Pyridine II. Reaktionen der 3-Halogenmethyl-pyridine (1976)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 59 (1976), S. 190-211 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Halogenated pyridines II. Reactions of 3-halogenomethyl-pyridines.The facile syntheis of 3-halogenomethyl-pyridines provides an easy access to a variety of new 2, 6-di- and 2, 5, 6-trihalogented pyridines with various functional groups in the 3-position of the pyridine ring. Substitution reactions of the 3-halogenomethyl groups, their Friedel Crafts reactions, and nitrations of the halogenated pyridine ring are reported.
    Additional Material: 9 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19760590122
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  • 8
    Electronic Resource
    Electronic Resource
    Halogenierte Pyridine IV. Kernchlorierte Pyridin-3-carbonsäuren (1976)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 59 (1976), S. 222-229 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Halogenated pyridines IV. Nuclear chlorinated pyridine-3-carboxylic acids.Chlorinated pyridine-3-carboxylic acids (nicotinic acids) are readily accessible by oxidation of nuclear chlorinated 3-chloromethyl-pyridines. The catalytic oxidation procedures proved to be by far the best ones of the methods tested.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19760590124
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  • 9
    Electronic Resource
    Electronic Resource
    Halogenierte Pyridine I. Die Herstellung von 3-Halogenmethylpyridinen aus dimerem Acrylnitril (1976)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 59 (1976), S. 179-190 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Halogenated pyridines I. The synthesis of 3-halogenomethyl pyridines from dimeric acrylonitrile.α-Methyleneglutaronitril, a linear dimerization product of acrylonitrile is a cheap, commercially available starting material for a new synthesis of 3-halogenomethyl-2, 6-dihalogeno- or 2,5,6-trihalogenopyridines prepared in two and three step reactions, respectively. The properties of this new class of halogenated pyridines are discussed.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19760590121
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  • 10
    Electronic Resource
    Electronic Resource
    Halogenierte Pyridine V. Fluorierte und bromierte Pyridinverbindungen (1976)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 59 (1976), S. 229-235 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Halogenated pyridines V.Fluorinated and brominated pyridine compounds.Ring chlorinated 3-chloromethyl-pyridines provide a source of new halogenopyridines the fluorination of which is described. Variously substituted 2, 6-dibromopyridines are prepared from the corresponding dichloro compounds by halogen displacement with hydrogen bromide in acetic acid at elevated temperatures.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19760590125
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