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  • Articles  (5)
  • Chemistry  (5)
  • General Chemistry
  • Polymer and Materials Science
  • 1980-1984  (3)
  • 1975-1979  (2)
  • 1981  (3)
  • 1979  (2)
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  • Articles  (5)
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  • 1980-1984  (3)
  • 1975-1979  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Synthese und Reaktionsverhalten von 2-Aryloxy-s-trithianen (1981)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 323 (1981), S. 939-950 
    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-Aryloxy-s-trithianes2-Aryloxy-s-trithianes 4 had been prepared from 1-tosyl-imino-1-SIV-1,3,5-trithiane and phenolates. - By self-condensation of 4 1,5-bis-(trithianyl)-1,3,5-trithiapentane 5 and triphenyl-orthoformate 7 are formed, accompanied by further products, which had been isolated in pure state and identified unambiguously by H-n.m.r. and mass-spectra. In the presence of acids the 2-aryloxy-s-trithianes 4 react with nucleophilic aromatic compounds such as phenoles, N,N-dimethylaniline, pyrrole, indole, and thiophenes to give the C-trithianylated products. With mercaptanes 2-alkylthio-s-trithianes are formed.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19813230612
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  • 2
    Electronic Resource
    Electronic Resource
    α-Substituierte Phosphonate. XXXIV. Zur Veresterung und N-Formylierung von α-Aminomethan-bisphosphonsäuren mit OrthoameisensäuretriethylesterHerrn Prof. Dr. Günther Hilgetag zum 70. Geburtstag gewidmet (1979)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 321 (1979), S. 361-369 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: α-Substituted Phosphonates. XXXIV. Esterification and N-Formylation of α-Aminomethane-bisphosphonic Acids with TriethylorthoformateIn contrast to simple mono- and bisphosphonic acids esterification of dialkylaminomethanebisphosphonic acids with orthoformate (OAE) proceeds very slowly. Monoalkyl and monoarylaminomethanebisphosphonic acids, respectively react with OAE in constrast to analogous hydroxy compounds more readily primarily by formylating the N-atom and then esterification to formyl aminomethane bisphosphonictetraesters 10. Acetaminomethanephosphonic acid (12) reacts without N-formylation, while the aminomethanebisphosphonic acid (14) reacted to give a mixture of mono- and bis-formylated products 15 and 16. By acidic hydrolysis of 10 the ester- and formylgroups are splitt off, while the ester group can selectively be removed by reaction with Me3SiBr/H2O. - As shown by 1H-, 13C- and 31P-n.m.r. spectroscopy the phosphorylated formamides 10 exists in two rotameres, the ratio depending on the solvent. The n.m.r. signals could be correlated to E-resp. Z-form undoubtedly by using shift-agents or the benzene-diluting technique. A rotational barrier of 22,8 kcal for 10c could be calculated.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19793210303
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  • 3
    Electronic Resource
    Electronic Resource
    Synthese von β-Nitroalkenyl-benzylphosphorylderivaten (1981)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 323 (1981), S. 353-359 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis of β-Nitroalkenyl-benzylphosphorylderivativesStarting from methoxy-chlormethylbenzaldehydes 2 the benzylphosphonates and -phosphinoxides 3 A, B had been synthesized, which could be transformed via the Schiff-bases 4 A, B to phosphorylated nitrostyrenes 5 A, B and nitropropenylbenzenederivatives 6 A, B. The phosphonoacids 3 Ad, 3 Bd and 6 Ba could be prepared from the corresponding esters by direct acidic hydrolysis or by dealkylation with trimethylsilylbromide and hydrolysis of the trimethylsilylesters respectively.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19813230302
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  • 4
    Electronic Resource
    Electronic Resource
    α-Substituierte Phosphonate. 37. α-Pyrrolomethanphosphonsäurederivate und N-Vinylpyrrole (1981)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 323 (1981), S. 877-886 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: α-Substituted Phosphonates. 37. Derivatives of α-Pyrrolomethanephosphonic Acid and N-VinylpyrrolesDiethyl α-aminomethanephosphonate 5a and its α-aryl derivatives 5b-d react with 2,5-diethoxytetrahydrofuran 1 to give diethyl α-pyrrolomethanephosphonate 9a and the α-aryl derivatives 9b-d, respectively. The pyrrolo derivatives 9 can be converted into the lithium salts 15 and 16, respectively, which with carbonyl compounds undergo the HORNER reaction yielding E/Z-mixtures of N-vinylpyrroles 18. In certain cases the intermediate of the HORNER reaction, the β-hydroxyphosphonate 17, can be isolated. The pyrrolo-analogue of stilbene, 18a, is formed only as E-isomer. On treating the lithium salts 15 and 16 with 9 or with alkyl halides α-C-alkylated pyrrolo-phosphonates 22 and 23, respectively, are obtained.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19813230605
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  • 5
    Electronic Resource
    Electronic Resource
    Derivate des Phosphorsäure - o - phenylenesters, XVIII. Zur Bromierung von o-substituierten aromatischen o-PhenylenphosphitenProfessor Kurt Issleib zum 60. Geburtstage gewidmet (1979)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 458 (1979), S. 108-112 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Derivatives of o-Phenylene Phosphates. XVIII. Bromination of o-substituted Aromatic o-Phenylene PhosphitesAryl-o-phenylene phosphites of the type 4 at room temperatures give with bromine by cyclization of the primary adduct the bromo-spirophosphorane 6A as the main product. As by products phosphorus tribromide, pentaoxyphosphoranes 10, and o-substituted phenyl-dibromophosphites 8 could be identified. The formation of the observed products can be explained by assumption of ligand-exchange reactions.
    Notes: Aryl-o-phenylenphosphite des Typs 4 geben bei Raumtemperatur mit Brom unter Cyclisierung des Primärproduktes als Hauptprodukt das Brom-spirophosphoran 6A; als Nebenprodukte wurden Phosphortribromid, Pentaoxyphosphorane 10 und o-subst. Phosphorigsäurephenylesterdibromide 8 nachgewiesen. Die Bildung der Produkte kann durch Ligandenübertragungsreaktionen erklärt werden.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19794580115
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