Počet záznamů: 1

Incremental iodination of the eight-vertex closo monocarborane anion [closo-1-CB7H8](-): preparation and characterization of [closo-1-CB7H5-6,7,8-I-3](-) and [closo-1-CB7H2-2,3,4,6,7,8-I-6](-), and the synthesis of the first eight-vertex C-methylated carborane anion [1-CH3-closo-1-CB7H4-6,7,8-I-3](-)

  1. 1.
    0356979 - UACH-T 2011 RIV CZ eng J - Článek v odborném periodiku
    Dostál, Radim - Londesborough, Michael Geoffrey Stephen - Kvíčalová, Magdalena - Macháček, Jan - Císařová, I. - Janoušek, Zbyněk
    Incremental iodination of the eight-vertex closo monocarborane anion [closo-1-CB7H8](-): preparation and characterization of [closo-1-CB7H5-6,7,8-I-3](-) and [closo-1-CB7H2-2,3,4,6,7,8-I-6](-), and the synthesis of the first eight-vertex C-methylated carborane anion [1-CH3-closo-1-CB7H4-6,7,8-I-3](-).
    Collection of Czechoslovak Chemical Communications. Roč. 75, č. 9 (2010), s. 931-947 ISSN 0010-0765
    Grant CEP: GA MŠk LC523; GA MŠk ME09114
    Výzkumný záměr: CEZ:AV0Z40320502
    Klíčová slova: carboranes * monocarborane anions * eight-vertex
    Kód oboru RIV: CA - Anorganická chemie
    Impakt faktor: 0.853, rok: 2010

    Iodination of [closo-1-CB7H8](-) (anion 1) with elemental iodine under various controlled conditions yields a continuum from mono-to hexaiodinated derivatives including the previously unknown [closo-1-CB7H5-6,7,8-I-3](-) (anion 5) and [closo-1-CB7H2-2,3,4,6,7,8-I-6](-) (anion 8). These species, characterized by mass spectrometry and NMR spectroscopy, and, in the case of 8, by single-crystal X-ray diffraction, provide insight into the fluxional molecular behavior of anion 1 in solution. Investigation of direct electrophilic substitution on the carbon-vertex of anion 1 using standard conditions and reagents (deprotonation by BuLi followed by addition of electrophile) proved futile, but the same conditions when using the new triiodo-deravitive anion 5 resulted in the formation of the first eight-vertex C-methylated carborane anion [1-CH3-closo-1-CB7H4-6,7,8-I-3](-) (anion 9), in 60% yield.
    Trvalý link: http://hdl.handle.net/11104/0195358