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  • Chemistry  (6)
  • Industrial Chemistry
  • General Chemistry
  • 1980-1984  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Darstellung und Reaktionen von 2-Arylazo-2-nitro-keten-aminalen (1980)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 322 (1980), S. 87-93 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis and Reactions of 2-Arylazo-2-nitro-keten AminalsN,N′-Disubstituted 1-nitro-2,2-diamino ethylenes 1 undergo azo-coupling to form the title compounds 2. Their treatment with oxalyl chloride yields the imidazolidin-4,5-dione-derivatives 4. 2 react with phosgene and thiophosgene to form 6-nitro-2,4-diaryl-5-arylimino-2,3,4,5-tetrahydro-1,2,4-triazin-3-ones 5 and -thiones 6 respectively. From 2 and N-(dichloromethylene)-arylsulfoamides the 6-nitro-2,4-diaryl-5-arylimino-3-aryl-sulfonylimino-2,3,4,5-tetrahydro-1,2,4-triazines 7 arise. The reduction of 2 yields the substituted oxalic amidines 9
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19803220112
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  • 2
    Electronic Resource
    Electronic Resource
    3-Amino-5-nitromethylen-1,2-dithiol-4-carbonsäureester (1981)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 323 (1981), S. 133-136 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Methyl(3-amino-5-nitromethylene-1,2-dithiol-4)carboxylate
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19813230119
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  • 3
    Electronic Resource
    Electronic Resource
    Nitromethylpyrazole aus 2-Cyan-3-methylthio-4-nitrocrotonsäurederivaten (1983)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 325 (1983), S. 41-48 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 3-Nitromethyl-pyrazoles from 2-Cyano-3-methylthio-4-nitrocrotonic Acid Derivatives2-Cyano-3-methylthio-4-nitrocrotonic Acid Derivatives 1a, b react with hydrazines to form the 5-amino-3-nitromethyl-pyrazoles 2a-c and the 5-nitromethyl-pyrazol-3-one 3 respectively. Contrary to this carboxylic hydrazides attacks the nitro group. For the resulting products the structure of pyrrol-2,5-dione oximes 4 is proposed. On the similar way from 3-methylthio-4-nitro-2-phenylcrotononitrile 1c and phenylhydrazine the pyrrol-2,5-dione hydrazone 5 arises. Subsequent reactions of 2 yield 3-nitromethyl-pyrazole derivatives 6, 3-nitromethyl-azinones 8 and nitromethyl-pyrazolyl-azo compounds 10.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19833250106
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  • 4
    Electronic Resource
    Electronic Resource
    2-Arylamino-thiophen-3-carbonsäurederivate (1984)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 917-923 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 2-Arylamino-thiophene-3-carboxylic Acid DerivativesThe title compounds 3 are synthesized by reaction of 2-amino-thiophene-3-carboxylic acid derivatives 1 with anilines. The nucleophilic 5-position in 3 allowed the synthesis of 5-aryliden-Δ3-thiolen-2-one-imines 5, 6 and the oxidative coupling to yield the azo compound 7. 1-Aryl-thieno-[2,3-d]pyrimid-4-ones 9, the thieno[2,3-b]chinolin-4-one 10 and the 4-chloro thieno[2,3-b]chinolines 10, 11 can be obtained from 3.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19843260609
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  • 5
    Electronic Resource
    Electronic Resource
    Substituierte 4-Nitropyrazole aus Nitroketenaminalen (1981)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 323 (1981), S. 332-336 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Substituted 4-Nitropyrazoles from Nitroketenaminals
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19813230221
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  • 6
    Electronic Resource
    Electronic Resource
    Reaktion von methylenaktiven Nitrilen und Cyanamid mit acylierten Enaminen (1982)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 324 (1982), S. 933-941 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reaction of Methylene Active Nitriles and Cyanamide with Acylated EnaminesThe addition products from enamines onto isocyanates and isothiocyanates, i.e. substituted β-aminoacrylo amides 1 and thioamides 2, react with malononitrile to yield the 6-amino-1-aryl-5-cyano-pyridin-2-ones 3 and -thiones 4 among them 5,6,7,8-tetrahydroisoquinolin-1-ones and -thiones. From ethyl cyanoacetate the 5-cyano-6-hydroxy-pyridin-2-ones 7 and from benzoyl acetonitrile the 6-phenyl-pyridin-2-ones 8 are formed. The replacement of malononitrile by cyanamide yields the 2-amino-3-aryl-pyrimidin-4-ones 5 and -thiones 6 among them 5,6,7,8-tetrahydroquinazolin-4-ones and -thiones. The not isolated β-acyl enamines derived from enamines and acid chlorides react with malononitrile or cyanamide to form the pyridin-2-ones 14 or pyrimidin-2-ones 15 caused by Dimroth-rearrangement.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19823240611
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