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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 914-921 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses with Nitriles, XXXV. Reactions of Tetracyanoethylene with Heterocyclic CompoundsThe reaction of tetracyanoethylene with barbituric acids yields tetrahydro-2H-pyrano[2.3-d]-pyrimidines (2a, b) or dipyrimidinylmalonodinitriles (3a, b) depending on the reaction temperature. 1,3-Disubstituted 5-pyrazolones react in a similar way. Reaction of 3-amino-pyrazoles with tetracyanoethylene results in elimination of HCN and formation of (tricyanovinyl)pyrazoles (12a, b), which cyclize to pyrazolo[3.4-b]pyridines (13a-c).
    Notes: Bei der Umsetzung von Tetracyanäthylen mit Barbitursäuren werden in Abhängigkeit von der Reaktionstemperatur Tetrahydro-2H-pyrano[2.3-d]pyrimidine (2a, b) oder Dipyrimidinylmalodinitrile (3a, b) erhalten. 1,3-Disubstituierte 5-Pyrazolone reagieren in ähnlicher Weise. Aus 3-Aminopyrazolen und Tetracyanäthylen entstehen unter Eliminierung von HCN (Tricyanvinyl)pyrazole (12a, b), welche zu Pyrazolo[3.4-b]pyridinen (13a-c) cyclisiert werden können.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 1787-1796 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses with Nitriles, XLI. Polymethines from Cyanoacetone Hydrazones and TetracyanoethyleneThe reaction of tetracyanoethylene (TCNE) with the activated methylene group of cyanoacetone phenylhydrazones has been investigated in aprotic solvents. With 3-(phenylhydrazono)butyronitrile (1a) a charge transfer complex 4a has been isolated from benzene solutions. This complex is unstable at room temperature, towards irradiation (u. v. and visible) and in polar solvents. Elimination of malononitrile yields 3-phenylhydrazono-1-butene-1,1,2-tricarbonitriles 6, deep-red to blue compounds which are classified as aza-cyanine type polymethine dyes. Elimination of HCN from 4a leads to 1-phenyl-1H-pyrazolo [3,4-b] pyridine-4,5-dicarbonitriles 5. Kinetic measurements and corresponding model calculations have been carried out, but differentiation between possible sequences of reactions has not been achieved within the experimentally practicable range of concentration.
    Notes: Tetracyanäthylen (TCNE) reagiert in aprotischen Lösungsmitteln mit der reaktiven Methylengruppe von Cyanaceton-phenylhydrazonen. In Benzol kann dabei mit 3-(Phenylhydrazono)-butyronitril (1a) ein Charge-Transfer-Komplex 4a isoliert werden. Dieser ist gegenüber polaren Lösungsmitteln bzw. Temperaturerhöhung und Licht instabil. Durch Abspaltung von Malononitril entstehen als Folgeprodukte die tiefroten bis blauen Aza-cyanine 3-Arylhydrazono-1-buten-1,1,2-tricarbonitrile 6 bzw. durch Eliminierung von HCN 1-Phenyl-1 H-pyrazolo [3,4-b]-pyridin-4,5-dicarbonitrile 5. Kinetische Messungen des Zerfalls des Charge-Transfer- Komplexes und Modellrechnungen zur Beschreibung der Reaktionssequenz der Synthese von 5 erbrachten innerhalb des experimentell möglichen Konzentrationsbereichs keine Unterscheidung zwischen den ausgewählten Modellen.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0009-2940
    Keywords: Nitriles ; Spiro compounds ; Propellanes ; Indan derivatives ; Cycloaddition ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthese with Nitriles, LXXXII1). - On spiro [indan-pyrans] and Indene-propellanes - Adducts of 2-(Diccyanomethylene)-1,3-indandione with 1,3-Dicarbonyl CompoundsThe reactivity of 2-(dicyanomethylene)-1,3-indandione (1) towards 1,3-dicarbonyl compounds depends strongly on the nature of the CH acidic component. While the reaction with dimedone yields a spiro[chromene-4,2′indan] (2), indene-propellanes (3) are formed with acetoacetic esters. Adducts of acetylacetone and benzoylacetic acid ethyl ester to 1 have been identified as spiro[indan-2,2′-pyrans] (4). The propellane structure 3 is proven by X-ray analysis. Adducts 6 of CH acidic components with 3-(dicyanomethylene)-2-indolones 5 are used for reference measurements.
    Notes: 2-(Dicyanmethylen)-1,3-indandion (1) zeigt gegenüber 1,3-Dicarbonylverbindungen ein überraschend differenziertes Reaktionsverhalten, das von der CH-aciden Komponente abhängt. Während mit Dimedon ein Spiro[chromen-4,2′-indan] (2) entsteht, führt die Reaktion mit Acetessigsäure-ethyl- bzw. -tert-butylester zur Bildung der Inden-propellane 3. Die Addukte von Acetylacaton und Benzoylessigsäure-ethylester an 1 erweisen sich als Spiro[indan-2,2′-pyrane] (4). Die Propellanstruktur 3 wird durch eine Röntgenkristallstrukturanalyse abgesichert. Addukte 6 CH-acider Komponenten an 3-(Dicyanmethylen)-2-indolone 5 werden für Vergleichsmessungen verwendet.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 110 (1977), S. 2276-2282 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses with Nitriles, XLV. 2-(1,3-Dioxo-2-indanylidene)benzimidazoline  -  an Isomer of IndigoThe reaction of 2-dicyanomethylene 1,3-indandione (1) with o-phenylenediamine has been investigated and 2-(1,3-dioxo-2-indanylidene)benzimidazoline (4) and (11H-indeno[1,2-b]quinoxaline-11-ylidene)malononitrile (5) have been isolated. Proof of structure is given by isolated intermediates and alternative syntheses. Compounds 4a-d can be classified as isomers of indigo with respect to the C = O and NH-functions.
    Notes: 2-Dicyanmethylen-1,3-indandion (1) reagiert mito-Phenylendiamin zu einem Gemisch von 2-(1,3-Dioxo-2-indanyliden)benzimidazolin (4) und (11H-Indeno[1,2-b]chinoxalin-11-yliden)-malononitril (5). Sowohl durch isolierte Zwischenprodukte, als auch durch Alternativsynthesen ergeben sich Strukturbeweise. Die Verbindungen 4a-d sind in bezug auf die Lage der C = O-bzw. NH-Funktionen als Isomere des Indigos anzusprechen.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 339 (1997), S. 742-745 
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: (N-Phenyl-aza-crown)-ethenyl-acridines - Complexing Chromoionophores and Precursors for Deep Blue Coloured HemicyaninesAromatic aldehyde derivatives of N-phenyl-aza-15-crown-5 and N-phenyl-aza-18-crown-6 (1a-b) are condensed with 9-methylacridine to give yellow phenyl-ethenylacridine derivatives 3a-b which are reversibly converted by protonation into deep blue colored hemicyanines, Using 9,10-dimethylacridinium perchlorate in the condensation with the crown ether aldehyde 1 the blue hemicyanine 6 is directly obtained. UV/VIS absorption spectra of the basic/acidic forms of the acridine derivatives are presented. The complex formation of the crown ether derivatives with Na+ and K+ are studied using 1H-NMR and UV/VIS spectroscopy.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 83 (1971), S. 912-912 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 53 (1976), S. 81-91 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Coloured polymers were obtained by copolymerisation of styrene with N-(2,4-dinitrophenylhydrazono methylene)-acrylamide (2), which can be synthesized by condensation of N-formylacrylamide (1) with 2,4-dinitrophenylhydrazine as well as by reaction of copolymers of (1) with 1,4-diaminoanthraquinone or 4-aminoazobenzene. Analyses of the products by gel permeation chromatography showed that the coloured substances were combined to the polymer chain by covalent bonding.
    Notes: Gefärbte Polymere werden erhaiten durch Copolymerisation von Styrol mit N-(2,4-Dinitrophenylhydrazono-methylen)-acrylsäureamid (2), das durch Kondensation von N-Formylacrylamid (1) mit 2,4-Dinitrophenylhydrazin dargestellt werden kann, sowie durch Umsetzung von Copolymerisaten des N-Formylacrylamids mit 1,4-Diaminoanthrachinon und 4-Aminoazobenzol. Die Produkte enthalten die Farbstoffe in kovalenter Bindung, wie durch Gelchromatographie gezeigt werden kann.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 79 (1979), S. 207-221 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Polymers and oligomers of diethanolaniline were reacted with 2-dicyanomethylen-1,3-indandione to yield colourless adducts, which can be converted to deep blue merocyanine dyes by heating to 80-120°C.
    Notes: Durch Umsetzung von Polymeren und Oligomeren des Diäthanolanilins mit 2-Dicyan-methylen-1,3-indandion werden farblose Addukte erhalten, die beim Erwärmen auf 80-120°C in tiefblaue Merocyaninfarbstoffe übergehen.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es werden geeignete Synthesen angegeben für verschiedene 1,4,6-Trioxa-spiro-(4,4)-nonane, die die bemerkenswerte Fähigkeit haben, unter Volumenexpansion oder zumindest mit sehr geringem Schrumpf zu polymerisieren.
    Notes: Convenient syntheses are given for several 1,4,6-trioxa-spiro-(4,4)-nonanes, which possess the remarkable ability to polymerize under expansion in volume or at least with very low shrinkage.
    Type of Medium: Electronic Resource
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