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  • 1980-1984  (4)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Preparation of 1-(4-nitrophenyl)-2-formylpyrrole from furfural (1981)
    Springer
    Chemistry of heterocyclic compounds 17 (1981), S. 786-790 
    Details
    ISSN: 1573-8353
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The products of the condensation of furfural with p-nitroaniline in an acidic medium in various solvents were investigated. It was established that the well-known method gives 1-(4-nitrophenyl)-2-formylpyrrole in no higher than 55% yield and 2,3-bis(4-nitrophenylamino)-2-formylpyrrole in 27% yield. A method based on a previously described method is recommended (the products are obtained in up to 72% yields).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503659
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Bromination of 1-(4-nitrophenyl)-2-formylpyrrole (1982)
    Springer
    Chemistry of heterocyclic compounds 18 (1982), S. 499-502 
    Details
    ISSN: 1573-8353
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Depending on the amount of bromine, the bromination of 1-(4-nitrophenyl)-2-formylpyrrole with bromine in chloroform without a catalyst gives 5-bromo and 4,5-dibromo derivatives. 4-Bromo-1-(4-nitrophenyl)-2-formylpyrrole is formed in the presence of excess AlC13, while a mixture of 3,4- and 4,5-dibromo derivatives with preponderance of the latter is formed with excess bromine. The results are compared with the literature data on the bromination of 2-formylpyrrole, 2-formylfuran, and 2-formylthiophene and are interpreted with allowance for the electronacceptor effect of the p-nitrophenyl substituent attached to the nitrogen atom of the pyrrole ring.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00526086
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Reactions of aldehydes of the furan series. 2. Oxidation with sodium hypohalites (1982)
    Springer
    Chemistry of heterocyclic compounds 18 (1982), S. 1132-1136 
    Details
    ISSN: 1573-8353
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The conditions for the oxidation of formylfurans with sodium hypobromite and hypochlorite that promote an increase in the yields for the furancarboxylic acids were investigated. The usual composition of the hypohalite mixture [NaOH]∶[X2] = 3 gives low yields of the furancarboxylic acids, particularly on the basis of 5-methylfurfural. Doubling the relative percentage of alkali promotes an increase in the efficiency of the reaction. An interpretation of the process is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00506357
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Oxidation of 1-(4-nitrophenyl)-2-formylpyrrole (1982)
    Springer
    Chemistry of heterocyclic compounds 18 (1982), S. 375-379 
    Details
    ISSN: 1573-8353
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Pyrrole aldehydes interact with oxidizing agents to yield products which are oxidized to different degrees. Pyrrolecarboxylic acids are formed under the influence of silver oxides, an alkaline solution of permanganate, and 2–10% sulfuric acid [1–3]. With peroxidation of hydrogen, 5-unsubstituted pyrrole aldehydes convert to pyrrolone [4], and pyrrol-2-aldehyde converts to succinimide [5]. Chromacetate and chromium sulfuric acids oxidize pyrrole aldehydes to maleinimides [3].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503556
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    Paper (German National Licenses)
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