Bis(Pentafluorophenyl) (2-perfluorobiphenylyl)borane. A new perfluoroarylborane cocatalyst for single-site olefin polymerization

Liting Li, Charlotte L. Stern, Tobin J Marks

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

Bis(pentafluorophenyl)(2-perfluorobiphenylyl)borane, (C6F5)2B(C12F9) (BPB), has been synthesized and characterized to serve as a new strong organo-Lewis acid cocatalyst for single-site olefin polymerization. BPB efficiently activates a variety of group 4 dimethyl complexes to form highly active homogeneous Ziegler-Natta olefin polymerization catalysts. Reaction of BPB with Cp2ZrMe2, rac-Me2Si(Ind)2ZrMe2) and (CGC)MMe2 (M = Zr, Ti; CGC = Me2Si(n5Me4C5)(tBuN)) (1:1 molar ratio) rapidly and cleanly produces the base-free cationic complexes Cp2ZrMe+[MeB(C12F9)(C 6F5)2]- (1), rac-Me2Si(Ind)2ZrMe+[MeB(C12F 9)(C6F5)2]- (2), and (CGC)MMe+[MeB(C12F9)(C6F 5)2]- (M = Zr, 3; M = Ti, 4), respectively. These complexes have been characterized by NMR and elemental analysis and are shown to be competent for ethylene and propylene polymerization. In general, BPB-derived catalysts exhibit polymerization activities comparable to or higher than those of the B(C6F5)3-derived analogues, with the products exhibiting higher molecular weights but comparable polydispersities, polypropylene isotacticities, and, for ethylene + 1-hexene, comonomer incorporation.

Original languageEnglish
Pages (from-to)3332-3337
Number of pages6
JournalOrganometallics
Volume19
Issue number17
Publication statusPublished - 2000

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Boranes
boranes
Alkenes
alkenes
polymerization
Polymerization
ethylene
catalysts
Lewis Acids
hexenes
Catalysts
Polypropylenes
Polydispersity
propylene
polypropylene
molecular weight
Molecular weight
Nuclear magnetic resonance
analogs
nuclear magnetic resonance

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Organic Chemistry

Cite this

Bis(Pentafluorophenyl) (2-perfluorobiphenylyl)borane. A new perfluoroarylborane cocatalyst for single-site olefin polymerization. / Li, Liting; Stern, Charlotte L.; Marks, Tobin J.

In: Organometallics, Vol. 19, No. 17, 2000, p. 3332-3337.

Research output: Contribution to journalArticle

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abstract = "Bis(pentafluorophenyl)(2-perfluorobiphenylyl)borane, (C6F5)2B(C12F9) (BPB), has been synthesized and characterized to serve as a new strong organo-Lewis acid cocatalyst for single-site olefin polymerization. BPB efficiently activates a variety of group 4 dimethyl complexes to form highly active homogeneous Ziegler-Natta olefin polymerization catalysts. Reaction of BPB with Cp2ZrMe2, rac-Me2Si(Ind)2ZrMe2) and (CGC)MMe2 (M = Zr, Ti; CGC = Me2Si(n5Me4C5)(tBuN)) (1:1 molar ratio) rapidly and cleanly produces the base-free cationic complexes Cp2ZrMe+[MeB(C12F9)(C 6F5)2]- (1), rac-Me2Si(Ind)2ZrMe+[MeB(C12F 9)(C6F5)2]- (2), and (CGC)MMe+[MeB(C12F9)(C6F 5)2]- (M = Zr, 3; M = Ti, 4), respectively. These complexes have been characterized by NMR and elemental analysis and are shown to be competent for ethylene and propylene polymerization. In general, BPB-derived catalysts exhibit polymerization activities comparable to or higher than those of the B(C6F5)3-derived analogues, with the products exhibiting higher molecular weights but comparable polydispersities, polypropylene isotacticities, and, for ethylene + 1-hexene, comonomer incorporation.",
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