Aryloxy Alkyl Magnesium versus Dialkyl Magnesium in the Lanthanidocene-Catalyzed Coordinative Chain Transfer Polymerization of Ethylene

Complexes [(1,2,4-Ph3C5H2)2NdCl2K(THF)2]2 (Nd1), {[1,2-Ph2-4-(4-MeOC6H4)C5H2]2NdCl2K(THF)2}2 (Nd2), {[1,2-Ph2-4-(2-MeOC6H4)C5H2]2NdCl2[K(THF)4]}(THF)0.5 (Nd3), and [(1,2,4-Ph3C5H2)2TbCl2K]2 (Tb1) have been synthesized, studied by X-ray diffraction analysis, and used in coordinative chain transfer polymerization (CCTP) of ethylene upon activation by alkyl magnesium derivatives. The complexes Nd1 and Tb1 exhibiting similar molecular structures and the same core type have demonstrated similar catalytic activities. Two types of alkylating/chain transfer agents, namely, di-n-butyl magnesium and heteroleptic complex (BHT)Mg(THF)2 nBu Mg1 (BHT = 2,6-di-tert-butyl-4-methylphenoxide), have been studied in this reaction. We have found that (BHT)Mg(PE) products (PE is an oligoethylene chain) are being formed at a relatively high rate while using Mg1 at 40 °C in the solution polymerization of ethylene; the oligomeric products comprise more than 40 ethylene fragments, unlike Mg(PE)2 derivatives, which are obtained from MgnBu2 and contain about 20 ethylene fragments. Luminescence spectroscopy study of the reaction mixtures, while initiating the complex Tb1 by MgnBu2 or Mg1, confirmed the structural proximity and high symmetry of the catalytic complexes for both types of Mg reagents. These experimental results reaffirmed the hypothesis about the CCTP mechanism, suggesting the formation of trinuclear LnMg2 catalytic species. Within this mechanism, we can explain the increase in the polymerization degree (Pn) when Mg1 is used by growing a single oligoethylene chain (PE) per a Mg atom to form (μ-BHT)2Mg2(PE)2 species, whereas application of MgnBu2 provides the growth of two PE chains to form the Mg2(PE)4 product with lower solubility. © 2019 American Chemical Society.

Minyaev M.E.1 , Komarov P.D.1 , Roitershtein D.M.1, 2, 3 , Lyssenko K.A.4, 5 , Nifant'Ev I.E.1, 5 , Puntus L.N.1, 6 , Varaksina E.A.1, 7 , Borisov R.S. 1, 8 , Dyadchenko V.P.5 , Ivchenko P.V.1, 5
American Chemical Society
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  • 1 A.V. Topchiev Institute of Petrochemical Synthesis, Leninsky pr. 29, Moscow, 119991, Russian Federation
  • 2 N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky pr. 47, Moscow, 119991, Russian Federation
  • 3 National Research University Higher School of Economics, Miasnitskaya Str. 20, Moscow, 101000, Russian Federation
  • 4 G.V. Plekhanov Russian University of Economics, 36 Stremyanny Per., Moscow, 117997, Russian Federation
  • 5 Chemistry Department, M.V. Lomonosov Moscow State University, 1 Leninskie Gory Str., Moscow, 119991, Russian Federation
  • 6 V.A. kotel'Nikov Institute of Radioengineering and Electronics, Russian Academy of Sciences, 11-7 Mokhovaya Str., Moscow, 125009, Russian Federation
  • 7 P.N. Lebedev Physical Institute, Russian Academy of Sciences, 53 Leninsky Prospect, Moscow, 119991, Russian Federation
  • 8 Peoples' Friendship University of Russia, 6 Miklukho-Maklaya Str., Moscow, 117198, Russian Federation
Ключевые слова
Activation analysis; Catalyst activity; Ethylene; Polymerization; Synthesis (chemical); X ray powder diffraction; Catalytic complexes; Catalytic species; Chain transfer polymerization; Heteroleptic complexes; Luminescence spectroscopy; Magnesium derivatives; Polymerization degree; Solution polymerization; Magnesium compounds
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