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  • Organic Chemistry  (4)
  • Animals
  • Molecular Sequence Data
  • 2000-2004
  • 1995-1999
  • 1975-1979  (4)
  • 1979  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Norrish Type I Cleavage of Aliphatic Carboxylic Acids and Esters in Solution. A CIDNP.-studyHerrn Prof. A.S. Dreiding zum 60. Geburtstag gewidmet (1979)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 62 (1979), S. 1475-1484 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: UV.-irradiation of pivalic and isobutyric acid and their methyl esters as well as of α-hydroxy isobutyric and malonic acid in solution lead to chemically induced dynamic nuclear polarization (CIDNP.) of parent compounds and of various reaction products. CIDNP.-effects and product distributions confirm α-cleavage of the C(α), CO bond to be the major mode of photodecomposition. Scavenger experiments indicate that decomposition of the molecules from a triplet excited state is roughly equally or more probable than from a singlet excited state. Quantum yields of educt disappearance are also given for the methyl esters of pivalic and isobutyric acid.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19790620512
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  • 2
    Electronic Resource
    Electronic Resource
    Cyclisierungsreaktionen von 1-[2-Amino-1-cyan-2-thio-]ethylen-pyridiniumbetainen (1979)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 321 (1979), S. 429-436 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Cyclization Reactions of 1-[2-amino-1-cyano-2-thio-]ethenepyridinium Ylides1-[2-Amino-1-cyano-2-thio-]ethene-pyridinium ylides 1 can be alkylated with methyliodide or α-haloesters and α-haloketones, respectively, to form 1-[2-alkyl(aryl)amino-1-cyano-2-methylthio-ethene-1]pyridinium iodides 2a--e or 1-[2-alkyl(aryl)-amino-1-cyano-2-alkoxy(aryl)-carbonylmethylthio-ethene-1] pyridinium salts 3a-f. With the exception of 3a-b the compounds 3 or 1 react with haloketones to yield 1-[4-amino-2-alkyl-(aryl)amino-5-benzoyl-thiene-3]pyridinium salts 4a-m or 3-alkyl-4-aryl-2-(1-cyano-1-pyridinium)methylene-Δ4-thiazoline salts 5a-f.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19793210312
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  • 3
    Electronic Resource
    Electronic Resource
    Reaktionen von 2,3-Dichlormaleinimiden mit methylenaktiven Verbindungen (1979)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 321 (1979), S. 787-796 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reactions of 2,3-Dichloromaleimides with Methyleneactive Compounds2,3-Dichloromaleimides 1 react with activated methylene compounds mainly under monosubstitution to give 2-6. Replacement of the second chloroatom gives 2,3-disubstituted maleimides 9-15 and stable ylides 16-27 with pyridine and triphenylphosphine, respectively. A general synthesis for such maleimid-ylides was found in a one-batch reaction from 2,3-dichloromaleimides 1 with methyleneactive compounds and pyridine or triphenylphosphine.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19793210510
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  • 4
    Electronic Resource
    Electronic Resource
    2-Nitrocyclohexanon durch Nitrierung von Cyclohexanon mit hochkonzentrierter Salpetersäure (1979)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1979 (1979), S. 612-616 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 2-Nitrocyclohexanone by Nitration of Cyclohexanone with Highly Concentrated Nitric Acid2-Nitrocyclohexanone (1) is important as an intermediate in the synthesis of Caprolactam and as a short-lived intermediate in the large-scale production of adipic acid from cyclohexanol and concentrated (ca. 68%) nitric acid. We have succeeded in preparing 1 by reaction of cyclohexanone with highly concentrated (99-100%) nitric acid. It was possible to isolate 1 by working at 20-400C in inert solvents and by almost completely preventing its further reaction to adipic acid by means of short reaction times, incomplete cyclohexanone and nitric acid conversion and stopping the reaction sequence by addition of ice/water.
    Notes: 2-Nitrocyclohexanon (1) besitzt als Zwischenprodukt einer Caprolactam-Synthese und als kurzlebige Zwischenstufe bei der großtechnischen Herstellung von Adipinsäure aus Cyclohexanol und konzentrierter (ca. 68proz.) Salpetersäure Bedeutung. Es gelang, Cyclohexanon mit hochkonzentrierter (99- bis 100proz.) Salpetersäure zu 1 umzusetzen. Die Verbindung 1 konnte isoliert werden, wenn man bei 20-400C in inerten Lösungsmitteln arbeitete und die Weiterreaktion von 1 zu Adipinsäure durch kurze Reaktionszeiten, unvollständigen Cyclohexanon- und Salpetersäure-Umsatz und Abbruch der Reaktionsfolge mit Eis/Wasser weitgehend verhinderte.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197919790505
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