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  • 1
    Electronic Resource
    Electronic Resource
    Aza-Enamine. VI. Umsetzungen von N,N-Dialkylhydrazonen aromatischer Aldehyde mit Sulfonylisocyanaten (1987)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 329 (1987), S. 246-258 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aza-enamines. VI. Reactions of N,N-Dialkylhydrazones of Aromatic Aldehydes with Sulfonyl IsocyanatesThe electrophilic attack of the sulfonyl isocyanates 2 on the arylaldehyde-N,N-dialkylhydrazones 1 takes place in dependence upon the substitutents R1 and NR2 at the nitrogen or carbon of the azomethine-group giving the 5-amino-hexahydro-1,3,5-triazine-2,4-diones 3, the phenylglyoxylic-acid-sulfonamide-N,N-dialkylhydrazones 4 and/or the imidazolidine-2,4-diones 5.The preparation and the u.v.-, i.r.- and n.m.r.-spectroscopic dates of the compounds 3-5 are reported.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19873290214
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Aza-Enamine. IX. UV/VIS- und NMR-spektroskopische Interpretation der Elektronenstruktur in Aldehydhydrazonen und daraus hergestellten Aza-Trimethinen (1990)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 332 (1990), S. 911-921 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aza-Enamines. IX. UV/VIS and N.M.R. Spectroscopic Interpretation of the Electron Structure in Aldehyde-N,N-dialkylhydrazones and in Aza-trimethines Prepared from TheseThe n.m.r. and u.v./vis spectroscopic data of the compounds 2, 3 and 4 - synthesized by electrophilic substitution at the azomethine carbon atom of the aldehyde hydrazones 1 according to the aza-enamine-concept - are reported. Compared to the respective C-atom of the starting hydrazones 1 the azomethine-C-atom of the compounds 2-4 exhibits a 13C-n.m.r. shift not corresponding to usual substituent effects. Our interpretation for this and for the u.v./vis spectroscopic data, too, is a simultaneous existence of both an aza-trimethine structural unit and an aromatic structure in the compounds 2-4.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19903320609
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Aza-Enamine, VIII. Elektrophile Substitutionsreaktionen am Azomethin-C-Atom von Aldehyddialkylhydrazonen: Vilsmeier-Formylierung und Folgereaktionen (1990)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 2039-2046 
    Details
    ISSN: 0009-2940
    Keywords: Aza-enamines ; Hydrazones ; Triazapentadienium salts ; Phenylglyoxal monohydrazones ; Pyrrolo[2,1-b]imidazoles ; Pyrrolo[1,2-b][1,2,4]triazinium salts ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aza-enamines, VIII.  -  Electrophilic Substitution Reactions at the Azomethine C-Atom of Aldehyde Dialkylhydrazones: Vilsmeier Formylation and Consecutive ReactionsThe reaction of hydrazones 1 with the Vilsmeier reagent yields 3-phenyl-1,4,5-triaza-1,3-pentadienium salts according to their aza-enamine character. Hydrolysis of 2 gives 1-phenylglyoxal 1-dialkylhydrazones 3, which rearrange in acidic media to 1-phenylglyoxal 2-dialkylhydrazones 4. Compound 3h forms the dihydropyrroloimidazole 5 in boiling ethanol. Pyrrolotriazinium salt 6 is obtained by the reaction of 1b with the isolated Vilsmeier reagent from dimethylformamide/oxalyl chloride.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19901231015
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    Paper (German National Licenses)
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