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  • 1
    Electronic Resource
    Electronic Resource
    Novel tocopherol compounds. III. Reaction of 5a-Bromo-α-tocopherol with Nucleophiles (1996)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 338 (1996), S. 647-653 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The synthesis of different classes of 5a-substituted tocopherols is described. These compounds are potent antioxidants and highly interesting as vitamin E carriers. The reaction of the readily available 5a-bromo-α-tocopherol with alcohols and phenols is shown to produce 5a-alkoxy-α-tocopherols (3-5, 8, 9) and 5a-aryloxy-α-tocopherols (6, 7), respectively, with high yields. 5a-α-Tocopheryl esters (10, 11) are prepared by reaction with metal carboxylates. 5a-Bromo-α-tocopherol is used as well to introduce tocopheryl groups into tertiary amines by quaternization, that renders these compounds (13, 14) soluble in water and in common organic solvents. 5a-Bromo-α-tocopherol also reacts as an alkylating agent with sterically hindered phenols in a Friedel-Crafts reaction. Phenols not highly substituted are exclusively alkylated in the para position at room temperature or below, whereas at higher temperature the para-as well as the ortho-alkylated product is observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.199633801123
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  • 2
    Electronic Resource
    Electronic Resource
    phosphororganische Antioxidantien. XII. Synthesen und NMR-Spektren phosphororganischer Antioxidantien und verwandter VerbindungenHerrn Prof. Dr. Dr. Heinz G.O. Becker zum 70. Geburtstag gewidmet (1992)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 334 (1992), S. 333-349 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Organophosphorus Antioxidants. XII. Synthesis and N.M.R. Spectroscopy of Organophosphorus Antioxidants and Related CompoundsThe syntheses of various aliphatic, aromatic, sterically hindered, and cyclic organophosphorus compounds (phosphorous acid esters, ester chlorides and ester amides, hydrogen phosphites, phosphonates and phosphates) are reported, and general procedures for preparation are given.The compounds synthesized were investigated by means of 31P-, 1H- and 13C-n.m.r. spectroscopy, and the chemical shifts measured are listed.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19923340407
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  • 3
    Electronic Resource
    Electronic Resource
    Phosphororganische Antioxidatien. X [1]. Über die hydroperoxidzersetzende Wirkung von Phosphiten, Phosphoniten und ThiophosphitenHerrn Prof. Dr. Manfred Schulz zum 60. Geburtstag gewidmet (1989)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 331 (1989), S. 913-922 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Organophosphorus Antioxidants. X. The Hydroperoxide Decomposing Action of Phosphites, Phosphonites and ThiophosphitesThe kinetics and mechanism of reactions of phosphites, phosphonites, thiophosphites and hydrogenphosphites with cumyl (CHP), t-butyl (TBHP) and α-tetralyl (THP) hydrogenperoxides has been studied by means of 31P-n.m.r. spectroscopy, high performance liquid chromatography and iodometric titration.All three valent phosphorus compounds studied initially react with hydroperoxides stoichiometrically to give the corresponding P=O products and alcohol. Some species are able to decompose cumyl hydroperoxide catalytically to form phenol and aceton.Acyloin phosphites decompose CHP catalytically after a stoichiometric reaction as thiophosphites do. Tetramethylpiperidinyl phosphites (“HALS-phosphites”) react with hydroperoxides only stoichiometrically but with high velocity.Phosphonites react with hydroperoxides in the same way as the corresponding phosphites. Their reactivity, however, is much higher.Hydrogenphosphites are less reactive than phosphites in the reaction with hydroperoxides. They are able to act catalytically.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19893310605
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  • 4
    Electronic Resource
    Electronic Resource
    Cyansäureester aus Thiocyanaten (1968)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 80 (1968), S. 42-42 
    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.19680800112
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  • 5
    Electronic Resource
    Electronic Resource
    Cyanic Esters from Thiocyanates (1968)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 7 (1968), S. 67-67 
    Details
    ISSN: 0570-0833
    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/anie.196800671
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