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  • 1
    Electronic Resource
    Electronic Resource
    3-Imino-1,4,2-dioxazolidines by [1 + 2 + 2] cycloaddition of an isocyanide, 2-methyl-2-nitrosopropane, and a carbonyl compound (1986)
    s.l. : American Chemical Society
    The @journal of organic chemistry 51 (1986), S. 732-734 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00355a028
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  • 2
    Electronic Resource
    Electronic Resource
    Hydroxylamin-Derivate, XXXVII. Hydroxylamine in der Vierkomponenten-Kondensation nach Ugi (1969)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 102 (1969), S. 2536-2546 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Hydroxylamin und seine N- und/oder O-Alkylderivate lassen sich im sauren wäßrig-alkoholischen Medium nach dem Syntheseprinzip der Vierkomponenten-Kondensation (Ugi-Reaktion) mit Aldehyden und Isocyaniden zu α-Hydroxylamino-carbonsäureamiden (4, 6, 8) (bzw. mit N-Isocyan-dialkylaminen zu α-Hydroxylamino-carbonsäurehydraziden 13) umsetzen. Aus Hydroxylaminen mit freier H2N-Gruppe erhält man in bestimmten Fällen fast ausschließlich Produkte einer „doppelten“ Ugi-Reaktion (9, 14).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19691020807
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  • 3
    Electronic Resource
    Electronic Resource
    Hydroxylamine in der Vierkomponenten-Kondensation nach Ugi, II (1974)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 2947-2955 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Hydroxylamines in the Four-Component Condensation (Ugi Reaction), IIHydroxylamines undergo the title reaction in the presence of hydrazoic acid to give the expected 1,5-disubstituted tetrazoles. In the case of an unsubstituted NH2 group a N,N-disubstituted reaction product is obtained, whereas in the case of severe steric hindrance the corresponding (hydroxyalkyl)tetrazole is formed. A few of the tetrazoles obtained were converted to acylderivatives, some of which are susceptible to side-chain pyrolysis under relatively mild conditions.
    Notes: Auf Hydroxylamine wird die Tetrazol-Variante der Titelreaktion angewandt; bei Vorliegen freier NH2-Gruppen tritt doppelte Umsetzung ein, während stärkere sterische Hinderung lediglich zur Bildung entsprechender (Hydroxyalkyl)tetrazole führt. Einige Produkte werden als Acylderivate charakterisiert, von denen ein Teil bei relativ niedriger Temperatur einer Seitenketten-Pyrolyse unterliegt.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19741070918
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  • 4
    Electronic Resource
    Electronic Resource
    2-Substituierte 5-Tetrazolcarbaldehyde (1975)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 887-896 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 2-Substituted 5-TetrazolecarbaldehydesThe new class of aldehydes 6 can be prepared in fair yields from 4 by use of the Kröhnke method. The compounds 6 exhibit typical aldehyde properties which are verified by spectroscopic data, derivatives, and standard reactions. As compared to the 1-isomers recently described emphasis is laid on differences as to much lower tendency of hydrate formation and to more common behaviour toward bases.
    Notes: Die bisher unbekannte Aldehydklasse 6 ist in befriedigender Ausbeute durch Anwendung der Kröhnke-Reaktion auf 4 zugänglich. Die typischen Aldehydeigenschaften von 6 werden durch spektroskopische Daten, Derivate und Standardreaktionen belegt. Beim Vergleich mit den kürzlich beschriebenen 1-Isomeren fallen Unterschiede auf, von denen die wesentlich geringere Tendenz zur Hydratbildung und das normalere Verhalten gegenüber Basen hervorgehoben seien.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19751080321
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  • 5
    Electronic Resource
    Electronic Resource
    Ein ungewöhnliches Amidin durch Ugi-Reaktion mit N-Methylhydroxylamin (1977)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 110 (1977), S. 3462-3463 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19771101028
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  • 6
    Electronic Resource
    Electronic Resource
    Ein Methanoditetrazolo-[1,3,6,8]tetrazecin aus 5-(Chlormethyl)tetrazol und Hexamethylentetramin (1989)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1989 (1989), S. 689-690 
    Details
    ISSN: 0170-2041
    Keywords: Methanoditetrazolo-[1,3,6,8]tetrazecine ; Hexamethylenetetramine ; Tetrazole, 5-(chloromethyl)- ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A Methanoditetrazolo-[1,3,6,8]tetrazecine from 5-(Chloro-methyl)tetrazole and HexamethylenetetramineIn contrast to N-substituted 5-(chloromethyl)tetrazoles (1; R=alkyl, aryl), the parent compound 1 (R=H) reacts with hexamethylenetetramine to give the methanoditetrazolo-[1,3,6,8]tetrazecine 4, a rather unusual system. This compound which is also produced on reaction of 7 with formaldehyde occurs in the (6RS,13RS) form.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198919890214
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  • 7
    Electronic Resource
    Electronic Resource
    4-Imidazolidinone aus Nitronen und Isocyaniden. - Molekülstruktur von 5-tert-Butyl-1,2,2-trimethyl-3-(2,4,6-tribromphenyl)-4-imidazolidinon (1984)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1984 (1984), S. 1685-1695 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 4-Imidazolidinones from Nitrones and Isocyanides. - Molecular Structure of 5-tert-Butyl-1,2,2-trimethyl-3(2,4,6-tribromophenyl)-4-imidazolidinoneCertain reactions of nitrone 1 and isocyanide 2, in the presence of ether - boron trifluoride, afford 4-imidazolidinones 4 which have been shown to be ring expansion products of the 4-imino-1,2-oxazetidines 3. 1,2,4-Oxadiazolidin-5-ones 5 (rather than 3 or 4) have been obtained from two further reactions of 1 with 2. - The constitution of 4 has been established by an X-ray analysis of the title compound 4c.
    Notes: Aus bestimmten Kombinationen von Nitron 1 und Isocyanid 2 erhält man in Gegenwart von Ether - Bortrifluorid nicht 4-Imino-1,2-oxazetidine 3, sondern deren Ringerweiterungsprodukte, die 4-Imidazolidinone 4. In zwei weiteren Fällen werden statt 3 oder 4 die 1,2,4-Oxadiazolidin-5-one 5 gefunden. - Die Konstitution 4 wird durch Röntgenstrukturanalyse des im Titel genannten Vertreters 4c bewiesen.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198419841008
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  • 8
    Electronic Resource
    Electronic Resource
    Ringspaltung von 1,2,3-Triazolium-Ionen mit Nucleophilen (1989)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1989 (1989), S. 1271-1274 
    Details
    ISSN: 0170-2041
    Keywords: 1,2,3-Triazolium salts ; Nitrilimines ; 1,2,4-Triazolium salts ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ring Cleavage of 1,2,3-Triazolium Ions with Nucleophiles
    Notes: The 1,2,3-triazolium salts 1 react with a variety of nucleophiles to give products of ring scission like 2-5. The new 1,2,3-triazolium reaction most probably does not follow the pattern known in the case of isoxazolium and furazanium salts.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.1989198902103
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  • 9
    Electronic Resource
    Electronic Resource
    Stabile 4-Imino-1,2-oxazetidine aus N-Neopentyliden-tert-butylamin-N-oxid und Isocyaniden (1980)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 92 (1980), S. 46-47 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19800920110
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  • 10
    Electronic Resource
    Electronic Resource
    Zur Reaktion von Isocyaniden mit Nitriliminen[1] (1994)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 1633-1639 
    Details
    ISSN: 0009-2940
    Keywords: Isocyanides ; Nitrile imines ; Triazolium salts ; Pyrazoles ; 1,2-Diazet-3-imines ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: On the Reaction of Isocyanides with Nitrile IminesFour competing reactions have been found to occur when nitrile imines 2 are generated from 1 in the presence of isocyanides 3. The products obtained include i) 1,2,3-triazolium salts 6, ii) 1,2,4-triazolium salts 8, iii) dihydrotriazolyl-substituted pyrazolamines 11, and iv) unstable 1,2-diazetimine derivatives 12 which in turn give carbodiimides 13, nitriles 14, quinoxalinamines 15, and possibly 1,2,4-triazoles 16 (after addition of 2). The proportions, in particular those of 6, 8, and 11, depend on the reaction conditions; thus, triethylamine used in excess can oppress the formation of 6 in favour of 8 and 11. - The structure of 11 has been elucidated by means of X-ray diffraction analyses of 11a and c.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19941270915
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