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Russian Chemical Bulletin

, Volume 68, Issue 1, pp 32–39 | Cite as

Neodymium dihalide complexes with a tridentate amidinate phosphine oxide ligand: synthesis, structure, and catalytic activity in isoprene polymerization

  • A. O. Tolpygin
  • O. A. Linnikova
  • T. A. Kovylina
  • A. V. Cherkasov
  • G. K. Fukin
  • A. A. TrifonovEmail author
Full Articles
  • 6 Downloads

Abstract

The deprotonation of amidine 2-[Ph2P(O)]C6H4NHC(But)=N(2,6-Me2C6H3) (1) with BunLi affords lithium amidinate {2-[Ph2P(O)]C6H4NLiC(But)=N(2,6-Me2C6H3)}2 (2) having a dimeric structure, as demonstrated by X-ray diffraction. New amidinate dihalide complexes {2-[Ph2P(O)]C6H4NC(But)N(2,6-Me2C6H3)}NdHal2(THF)2 (Hal = I (3), Cl (4)) were synthesized by exchange reactions of lithium and potassium amidinates with anhydrous neodymium halides NdHal3(THF)n (Hal = I, n = 3.5; Cl, n = 0). The X-ray diffraction studies showed that the new compounds are monomeric and the amidinate ligand is tridentate. Chloride complex 4 involved in the three- and four-component catalyst systems 4–AlR3–[Ph3C] [B(C6F5)4] (1: 10: 1; AlR3 = AlBui 3, AlMe3), 4–AlR3–PriOH (1: 10: 10; AlR3 = AlBui3, AlMe3), and 4–AlR3–[Ph3C][B(C6F5)4]–PriOH (1: 10: 1: 10; AlR3 = AlBui3, AlMe3) exhibits activity in stereospecific isoprene polymerization and allows the preparation of high-molecular-weight polyisoprene samples with exceptionally high cis-1,4-unit content (up to 99.4%).

Key words

neodymium complexes amidinate ligand halide complexes synthesis structure catalysis isoprene polymerization 

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Copyright information

© Springer Science+Business Media, Inc. 2019

Authors and Affiliations

  • A. O. Tolpygin
    • 1
  • O. A. Linnikova
    • 1
  • T. A. Kovylina
    • 1
  • A. V. Cherkasov
    • 1
  • G. K. Fukin
    • 1
  • A. A. Trifonov
    • 1
    • 2
    Email author
  1. 1.G. A. Razuvaev Institute of Organometallic ChemistryRussian Academy of SciencesNizhny NovgorodRussian Federation
  2. 2.A. N. Nesmeyanov Institute of Organoelement CompoundsRussian Academy of SciencesMoscowRussian Federation

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