7790-49-0Relevant articles and documents
C–F Bond Cleavage Reactions with Beryllium, Magnesium, Gallium, Hafnium, and Thorium Halides
Dankert, Fabian,Deubner, H. Lars,Müller, Matthias,Buchner, Magnus R.,Kraus, Florian,von H?nisch, Carsten
, p. 1501 - 1507 (2020)
The work describes unexpected stoichiometric C–F bond cleavage reactions of beryllium, magnesium, gallium, hafnium and thorium halides with α,α,α-trifluorotoluene. The reaction of BeBr2 / GaBr3 or MgBr2 / GaBr3 mixtures as well as neat GaI3 with α,α,α-trifluorotoluene in the presence of (OSi2Me4)2 (I) yields the carbenium ion containing compounds [Ph-C(O2Si2Me4)][GaX4] (X = Br: 1, X = I/F: 2). Both compounds were successfully characterized and a defluorination type reaction under incorporation of a siloxy unit was observed. Compound 1 was also characterized by single-crystal X-ray diffraction analysis. The conversion of α,α,α-trifluorotoluene with BeI2, HfI4 or ThI4 turned out to be a halodefluorination-type reaction with formation of α,α,α-triiodotoluene (3). An adequate NMR spectroscopic and the X-ray crystallographic characterization of 3 were performed for the first time.
A Simple Access to Pure Thorium(IV) Halides (ThCl4, ThBr4, and ThI4)
Deubner, H. Lars,Rudel, Stefan Sebastian,Kraus, Florian
, p. 2005 - 2010 (2017/12/26)
In this work we present a facile, lab scale synthesis for thorium tetrahalides ThX4 (X = Cl, Br, and I). The reaction between the easily available ThO2 and AlX3 (X = Cl, Br, and I) and a subsequent in situ chemical vapor transport (CVT) leads to a product of high purity, which is obtained in the form of crystals or large aggregates of crystals. Their identity and purity was evidenced by X-ray powder diffraction and IR spectroscopy. The usage of ThO2 avoids, unlike earlier syntheses, the utilization of scarcely available thorium metal or of other reactants, such as CCl4, which leads to impurities. Furthermore, the reaction tolerates even less pure ThO2.
Dioxouranium(VI) and thorium(IV) complexes of 1-methyl-2,2'-bisimidazole
Mansingh, P. S.,Mohanty, R. R.,Jena, S.,Dash, K.
, p. 639 - 642 (2007/10/03)
The biheterocyclic nitrogen donor ligand 1-methyl-2,2'-bisimidazole (MBIM) reacts with UO2X2 and ThX4 to form mononuclear complexes of the types UO2(MBIM)X2 (X=Cl, I, NCS, NO3, CH3COO, 0.5 SO4) and Th(MBIM)2X4 (X=NO3, I).The complexes are characterised by elemental analyses, conductivity, thermogravimetry and IR, NMR as well as mass spectra.The IR spectra of uranyl complexes exhibit ν(U=0) in the regions 900-925 and 825-860 cm-1 in addition to the vibrational bands of the ligand and those of the polyatomic anions.The 1H NMR spectra of the ligand and the complexes are identical, with the -CH3 group resonating at 3.5 ppm and the NH proton at 3.9 ppm region.The ring protons are observed as multiplets in the region of 7.0 to 8.0 ppm.The mass spectra of the ligand gives molecular ion peak at m/z 148 and other fragmentation products, which are appropriately assigned.However, for the complexes neither the molecular ion peak nor the metallated fragmentation patterns are observed.Thermogravimetry shows the loss of ligands in stages, finally forming the stable metal oxides as the end product.
