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  • Articles: DFG German National Licenses  (6)
  • 1985-1989  (6)
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  • Articles: DFG German National Licenses  (6)
Material
Years
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    An improved and facile synthesis of 2-amino-1,1,3-tricyanopropene (1985)
    Springer
    Monatshefte für Chemie 116 (1985), S. 689-691 
    Details
    ISSN: 1434-4475
    Keywords: Malononitrile ; Dimerization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Eine einfache Dimerisierung von Malononitril unter Verwendung von Alkalihydroxid in Methanol und Ethanol wird beschrieben. Dabei entsteht in guter Ausbeute 2-Amino-1,1,3-tricyan-propen, ein wichtiges Ausgangsprodukt zur Synthese von Heterocyclen.
    Notes: Abstract A simple method for the dimerization of malononitrile using alkali hydroxides in methanol or ethanol is described. Thereby 2-Amino-1,1,3-tricyanopropene, a keyintermediate for heterocyclic chemistry, is obtained in high yield.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00798796
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Bestimmung von 3-Hydroxy-6-methyl-pyridin in Zucker-Couleur durch Gaschromatographie (1987)
    Springer
    European food research and technology 184 (1987), S. 187-188 
    Details
    ISSN: 1438-2385
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Description / Table of Contents: Zusammenfassung Neben dem bekannten 4-Methylimidazol wird 3-Hydroxy-6-methyl-pyridin als weitere Leitsubstanz für Zuckercouleurs beschrieben. Nach Extraktion mit Diethylether und Überführung in ein Trimethylsilyl-Derivat erfolgt der gaschromatographische Nachweis mittels Flammenionisationsdetektor und Massenspektrometrie. Die Trennung erfolgt an einer fused-silica-Capillare, belegt mit SE 30. Als innerer Standard wird 3-Dimethylamino-phenol verwendet. 5 weitere Substanzen im Extrakt können über ihr Massenspektrum charakterisiert werden.
    Notes: Summary In addition to the well known 4-methyl-imidazole, 3-hydroxy-6-methyl-pyridine may be used as another indicator compound for caramels. After extraction with diethylether and derivatization with BSTFA the quantitative determination is performed by gas chromatography (flame ionisation and mass spectrometry as detectors). 3-Dimethylamino-phenol is used as internal standard. Five other compounds extracted from caramels are characterized by its mass spectra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01042204
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesen mit Nitrilen, LXXV Zur Reaktivität der Dimeren von Malononitril und Cyanessigester gegenüber Dimethylformamid-dimethylacetal (1987)
    Springer
    Monatshefte für Chemie 118 (1987), S. 617-626 
    Details
    ISSN: 1434-4475
    Keywords: Cyanoacetate ; Dimethylformamide-dimethylacetal ; Malononitrile
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Reaction of malononitrile dimer (1) and the codimer from cyanoacetate and malononitrile (2) with dimethylformamide-dimethylacetal (DMFDMA) leads to the monocondensation products5 a, b. The isomeric codimer3, however, gives the amidine6. Ring closure reactions of5 a with ammonia and primary aliphatic and aromatic amines yield 2,4-diamino-3,5-pyridinedicarbonitriles7 a–j, in the case of5 b the 4-amino-1,2-dihydro-2-oxo-3,5-pyridinedicarbonitriles8 b–i. Reactions of1 and2 with an excess ofDMFDMA give the biscondensation products11 a, 11 b.11 b reacts with primary aromatic amines to give the pyridine derivatives13. The structure of13 was confirmed by hydrolytical cleavage to the dicyano-aminopyridone14. Treatment of13 with concentrated hydrochloric acid leads to the pyridopyrimidine derivatives15.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00809673
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesen mit Nitrilen, LXXVII. Zur Synthese und Strukturaufklärung von 4-Amino-5-cyan-1-phenyl-3-pyridazincarbonsäure-Derivaten (1987)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1987 (1987), S. 889-892 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Syntheses with Nitriles, LXXVII. - Synthesis and Structure Analysis of 4-Amino-5-cyano-1-phenyl-3-pyridazinecarboxylatesReactions of 3-Amino-4,4-dicyano-3-butenoates (2d, e) with various aryl diazonium salts lead to 4-amino-5-cyano-1,6-dihydro-6-imino-1-phenyl-3-pyridazinecarboxylates 4a-k. In the case of 4a and 4b it is possible to isolate and to characterize the corresponding open-chain intermediates 3a and 3b. Hydrolysis of 4c gives a product, which can be identified by X-ray structure analysis as an inner salt of 4-amino-5-cyano-1,6-dihydro-6-imino-1-phenyl-3-pyridazinecarboxylic acid (5).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198719870844
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  • 5
    Electronic Resource
    Electronic Resource
    Synthesen mit Nitrilen, LXXVIII. Untersuchungen zur Struktur der Dimeren des Malononitrils, Cyanessigesters und Cyanacetamids (1987)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1987 (1987), S. 1131-1132 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Syntheses with Nitriles, LXXVIII. - Studies on the Structure of Dimers of Malononitrile, Cyanoacetate, and CyanoacetamideThe 13C- and 15N-NMR data of dimers and codimers of malononitrile, cyanoacetate, and cyanoacetamide 1-6 are discussed In the case of the unsymmetrically substituted derivatives 2, 4 and 5 it is possible to distinguish between E- and the predominantly existing Z-isomers. In the case of 2 the structure is confirmed by X-ray structure analysis.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198719870888
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  • 6
    Electronic Resource
    Electronic Resource
    Synthesen mit Nitrilen, LXXIV. 3-Amino-4,4-dicyan-3-butensäureester, ein Synthesebaustein aus der Reihe der Dimeren von Malononitril und Cyanessigester (1986)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1986 (1986), S. 533-544 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses with Nitriles, LXXIV.  -  3-Amino-4,4-dicyano-3-butenoate, a Synthetically Useful Dimer from Malononitrile and CyanoacetateAn improved synthesis of 3-amino-4,4-dicyano-3-butenoate (4) (a codimer from cyanoacetate and malononitrile) is described. The 13C NMR data and pKa value of 4 are compared with those of the isomeric codimer 3 and the dimers 1 and 2. Reaction of 4 with acids or bases leads to the 2(1H)-pyridones 8 and 9, respectively. Conversions of 4 with aldehydes, ketones, and nitroso compounds give the products 11, 14, and 15 as well as the benzopyran derivatives 12 and the 2-oxochinoline derivative 13 when using 2-hydroxy- and 2-aminobenzadehydes. 4 reacts with formamidine to yield the dihydropyrimidine derivative 17 and with sulfur to give the 3,5-diamino-4-cyano-2-thiophenecarboxylates (18).
    Notes: Für die 3-Amino-4,4-dicyan-3-butensäureester (4) (Codimeres aus Cyanessigester und Malononitril) wird eine verbesserte Synthese beschrieben. Die 13C-NMR-Daten und der pKs-Wert von 4 werden mit denen des isomeren Codimeren 3 sowie der Dimeren 1 und 2 verglichen. Reaktion von 4 mit Säuren oder Basen führt zu den 2(1H)-Pyridonen 8 bzw. 9. Umsetzungen von 4 mit Aldehyden, Ketonen und Nitrosoverbindungen liefern die Produkte 11, 14 und 15, wobei mit 2-Hydroxy- und 2-Aminobenzaldehyden die Benzopyranderivate 12 bzw. das 2-Oxochinolinderivat 13 entstehen. 4 liefert mit Formamidin das Dihydropyrimidinderivat 17 und mit Schwefel die 3,5-Diamino-4-cyan-2-thiophencarbonsäureester (18).
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198619860311
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    Paper (German National Licenses)
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