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  • 2020-2022  (1)
  • 1965-1969  (1)
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  • 1
    Publication Date: 2021-03-18
    Description: S=2 oxoiron(IV) species act as reactive intermediates in the catalytic cycle of nonheme iron oxygenases. The few available synthetic S=2 FeIV=O complexes known to date are often limited to trigonal bipyramidal and very rarely to octahedral geometries. Herein we describe the generation and characterization of an S=2 pseudotetrahedral FeIV=O complex 2 supported by the sterically demanding 1,4,7‐tri‐tert‐butyl‐1,4,7‐triazacyclononane ligand. Complex 2 is a very potent oxidant in hydrogen atom abstraction (HAA) reactions with large non‐classical deuterium kinetic isotope effects, suggesting hydrogen tunneling contributions. For sterically encumbered substrates, direct HAA is impeded and an alternative oxidative asynchronous proton‐coupled electron transfer mechanism prevails, which is unique within the nonheme oxoiron community. The high reactivity and the similar spectroscopic parameters make 2 one of the best electronic and functional models for a biological oxoiron(IV) intermediate of taurine dioxygenase (TauD‐J).
    Type: info:eu-repo/semantics/article
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 4 (1968), S. 81-90 
    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: Die Umsetzung von Äthylen-Propylen-Copolymeren mit Spendern von Carboniumionen, wie zum Beispiel Isopropylbenzol, führt in Gegenwart von sauren Katalysatoren zur Einführung von aromatischen und hydroxylischen Gruppen in das Polymerengerüst. Gasfömige Hauptprodukte sind Isobutan und Propan. Die Reaktion ist von Kettenspaltung begleitet.
    Notes: Reaction of solutions of ethylene-propylene copolymer with carbonium ion sources, such as isopropylbenzene, in the presence of acid catalysts leads to the introduction of the aromatic and hydroxylic moieties onto the copolymer backbone. Major gaseous products are isobutane and propane. Chain scission accompanies the reaction.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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