Browsing by Author "Lyapkov, Alex A."

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    Alkyl Group-Tagged Ruthenium Indenylidene Complexes: Synthesis, Characterization and Metathesis Activity
    (Elsevier, 2015) Yu, Baoyi; Hamad, Fatma B.; Leus, Karen; Lyapkov, Alex A.; Van Hecke, Kristof; Verpoort, Francis
    We report on the synthesis of ruthenium indenylidene catalysts [RuCl2(3-R-1-indenylidene)(PCy3)2inwhich R is iso-propyl (7a), tert-butyl (7b) or cyclohexyl (7c)]. The obtained alkyl tagged indenylidenecatalysts were analyzed by means of IR, elementa l analysis, NMR and single crystal X-Ray diffractionanalysis. Furthermore, the catalytic performance of these new complexes was examined in dif ferentmetathesis reactions: ring-closing metathesis (RCM), ring-closing ene-yne metathesis (RCEYM), ring-opening metathesis polymerization (ROMP) and cross metathesis (CM), exhibiting a comparable activ-ity in comparison with the commercially available catalyst 3a
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    Synthesis and Characterization of Non-Chelating Ruthenium–Indenylidene Olefin Metathesis Catalysts Derived From Substituted 1,1-Diphenyl-2-Propyn-1-Ols
    (2015) Yeates, Baoyi; Xie, Yu; Hamad, Fatma B.; Leus, Karen; Lyapkov, Alex A.; Van Hecke, Kristof; Verpoort, Francis
    We report on the synthesis and characterization of the first generation of modified non-chelating indenylidene ruthenium catalysts denoted as RuCl2(4-methyl-3-(o-tolyl)-1-indenylidene)(PCy3)2 5a, RuCl2(3-(p-fluorophenyl)-1-indenylidene)(PCy3)2 5b, RuCl2(3-(2,6-xylyl)-1-indenylidene)(PCy3)2 5c and RuCl2(3-(1-naphthyl)-1-indenylidene)(PCy3)2 5d. The obtained complexes of 5a–d were characterized by means of NMR spectroscopy and elemental analysis. Moreover the structures of 5a–d were confirmed by single-crystal X-ray diffraction and compared with the standard ruthenium indenylidene complex 3 and the chelating benzylidene complex 2. Additionally, the catalytic performances of the obtained complexes 5a–d were evaluated in various metathesis reactions demonstrating that the ring-closing metathesis (RCM) and ring-opening metathesis polymerization (ROMP) reactions revealed a similar catalytic activity in comparison with the reference indenylidene catalyst 3.