Preparation of High-Purity Ammonium Tetrakis(pentafluorophenyl)borate for the Activation of Olefin Polymerization Catalysts.

ABSTRACT: Homogeneous olefin polymerization catalysts are activated in situ with a co-catalyst ([PhN(Me)2-H]+[B(C6F5)4]- or [Ph3C]+[B(C6F5)4]-) in bulk polymerization media. These co-catalysts are insoluble in hydrocarbon solvents, requiring excess co-catalyst (>3 eq.). Feeding the activated species as a solution in an aliphatic hydrocarbon solvent may be advantageous over the in situ activation method. In this study, highly pure and soluble ammonium tetrakis(pentafluorophenyl)borates ([Me(C18H37)2N-H]+[B(C6F5)4]- and [(C18H37)2NH2]+[B(C6F5)4]-) containing neither water nor Cl- salt impurities were prepared easily via the acid-base reaction of [PhN(Me)2-H]+[B(C6F5)4]- and the corresponding amine. Using the prepared ammonium salts, the activation reactions of commercial-process-relevant metallocene (

SUBMITTER: Lee HJ 

PROVIDER: S-EPMC8126221 | biostudies-literature | 2021 May

REPOSITORIES: biostudies-literature