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  • 1
    Electronic Resource
    Electronic Resource
    Enolether, XVIII Eine einfache Synthese von Cumarinen (1987)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 373-378 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: In boiling 1,2-dichloroethane 3-ethoxyacryloyl chloride (1) reacts with phenols 2 to yield 3-ethoxyacrylates 3, which by treatment with conc. sulfuric acid/10% SO3 cyclize to give coumarins 9 in good yields. The methoxy-substituted compounds 3d and 3k do not react to coumarins 9 with H2SO4/SO3 but with POCl3/H2O at room temperature.
    Notes: Aus 3-Ethoxyacryloylchlorid (1) und Phenolen 2 entstehen in siedendem 1,2-Dichlorethan 3-Ethoxyacrylsäure-arylester 3, die sich mit konz. H2SO4/10% SO3 bei 0°C in guten Ausbeuten zu Cumarinen 9 cyclisieren lassen. Die 3-Ethoxyacrylsäure-methoxy-phenylester 3d und 3k cyclisieren unter diesen Bedingungen nicht, lassen sich jedoch mit POCl3/H2O bei Raumtemperatur ebenfalls in guten Ausbeuten in die entsprechenden Cumarine 9d und 9k überführen.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19871200320
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  • 2
    Electronic Resource
    Electronic Resource
    A λ5-cylotriphosphazene with nitroxyl groups as model for a paramagnetic poly(organo-λ5-phosphazene) (1988)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 189 (1988), S. 2611-2615 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Reaction of hexachlorocyclotriphosphazene (syst. name: 2,2,4,4,6,6-hexachloro-1,3,5,2λ5,4λ5,6λ5-triazatriphosphorine) (1) with 4-hydroxy-2,2,6,6-tetramethylpiperidin-1-oxyl (2a) gave the hexa-substituted λ5-cyclotriphosphazene 3a. Electron paramagnetic resonance spectra at low concentrations (10-5 mol/L) showed a singlet only (no triplet) due to spin-spin exchange in the molecule. The paramagnetic molar susceptibility amounts to 7229 · 10-6 cm3/mol at 300 K and does not depend on the magnetic field strength. 3a obeyed the Curie-Weiss law between 36 and 296 K demonstrating that there is no antiferromagnetic spin exchange.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1988.021891109
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