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  • 1
    Electronic Resource
    Electronic Resource
    Carben-Reaktionen, IV. Addition von Dimethoxycarben an C—C-Mehrfachbindungen (1974)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 3395-3407 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Carbene Reactions, IV. Addition of Dimethoxycarbene to C—C Multiple BondsDimethoxycarbene (1) adds to diethyl fumarate or maleate to form diethyl 3,3-dimethoxycyclopropane-trans-1,2-dicarboxylate (6). Addition to styrene derivatives yields similarly 3,3-dimethoxycyclopropanes, whereas addition to acetylenedicarboxylate, phenylacetylene or diphenylketene led to 1:2-adducts of varying structure.
    Notes: Dimethoxycarben (1) addiert an Fumar- oder Maleinester unter Bildung von 3,3-Dimethoxy-cyclopropan-trans-1,2-dicarbonester (6). Bei der Addition an Styrol-Derivate entstehen ebenfalls 3,3-Dimethoxycyclopropane, während mit Acetylendicarbonester, Phenylacetylen oder Diphenylketen 1:2-Addukte unterschiedlicher Struktur resultieren.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19741071024
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  • 2
    Electronic Resource
    Electronic Resource
    Thermische Methoxyl-Verschiebungen am 7.7-Dimethoxy-cycloheptatrien (1970)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 103 (1970), S. 1547-1560 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Thermal Methoxyl Shifts in 7, 7-DimethoxycycloheptatrieneThe temperature of 80-110° suffices to cause a methoxyl shift in 7,7-dimethoxycycloheptatriene (1) generating 1,7-dimethoxycycloheptatriene (3a). At 145 - 160° 1,5-hydrogen shifts in 3a compete with further methoxyl shifts resulting in the formation of the isomeric dimethoxy-cycloheptatrienes 4 and 5. Irradiation with u. v. light isomerises 1 into 4,4-dimethoxybicyclo[3.2.0]heptadiene 10.
    Notes: Bereits bei 80-110° erleidet 7.7-Dimethoxy-cycloheptatrien (1) eine Methoxyl-verschiebung zum 1.7-Dimethoxy-cycloheptatrien (3a). Bei 145-160° konkurrieren die 1.5-Wasserstoff-Verschiebungen in (3a) mit weiteren Methoxyl-Verschiebungen zu den isomeren Dimethoxy-cycloheptatrienen 4 und 5. Durch UV-Licht wird 1 zum 4,4-Dimethoxy-bicyclo[3.2.0]heptadien 10 isomerisiert.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19701030525
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  • 3
    Electronic Resource
    Electronic Resource
    Carben-Reaktionen, III. Addition von Dimethoxycarben an Isocyanate und Isothiocyanate (1973)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 2174-2184 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Carbene Reactions, III. Addition of Dimethoxycarbene to Isocyanates and IsothiocyanatesDimethoxycarbene (1) adds to aryl isocyanates to form 5,5-dimethoxyhydantoins (6) and to aryl isothiocyanates to form 5,5-dimethoxydithiohydantolns (11). Competition experiments using p-tolyl isocydnate/phenyl isothiocyanate showed that 1 reacted 11 times faster with the former irrespective of its mode of generation from either 2 or from trimethyl orthoformate (12).
    Notes: Dimethoxycarben (1) addiert sich an Arylisocyanate zu 5,5-Dimethoxyhydantoinen (6) und an Arylsenföle zu 5,5-Dimethoxydithiohydantoinen (11). Konkurrenzversuche im System p-Tolylisocyanat/Phenylsenföl zeigten, daß 1 11 mal rascher mit p-Tolylkocyanat reagiert, unabhägig davon, ob es durch Thermolyse von 2 oder durch Methanol-Abspaltung aus Orthoameisensäureester 12 freigesetzt wurde.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19731060711
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    Paper (German National Licenses)
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