Organometallics, 24 (21), 5103 -5109, 2005. 10.1021/om050463j S0276-7333(05)00463-2
Web Release Date: September 13, 2005

Copyright © 2005 American Chemical Society

[H(OEt2)2]+ and [Ph3C]+ Salts of the Borate Anions [B(CF3)4]-, [(CF3)3BCN]-, and [B(CN)4]-

Maik Finze,* Eduard Bernhardt, Michael Berkei, Helge Willner,* Joyce Hung, and Robert M. Waymouth*

FB C-Anorganische Chemie, Bergische Universität Wuppertal, Gaussstrasse 20, D-42097 Wuppertal, Germany, and Department of Chemistry, Stanford University, Stanford, California 94305

Received June 8, 2005

Abstract:

The reaction of gaseous HCl with K[B(CF3)4] in diethyl ether gave the oxonium acid [H(OEt2)2][B(CF3)4] as a stable salt at room temperature. Syntheses of [Ph3C][B(CF3)4] and [Ph3C][(CF3)3BCN] were accomplished from the corresponding potassium salts and Ph3CCl. The metathesis reaction of Ag[B(CN)4] with trityl bromide resulted in formation of [Ph3C][B(CN)4]. Treatment of Cp2ZrMe2 with [H(OEt2)2][B(CF3)4], [Ph3C][B(CF3)4], [Ph3C][(CF3)3BCN], and [Ph3C][B(CN)4], monitored by NMR spectroscopy, showed the formation of [Cp2ZrMe(OEt2)]+, [(Cp2ZrMe)2--Me]+, [Cp2ZrMe]+, Cp2ZrMe{NCB(CF3)3}, and Cp2Zr{NCB(CN)3}2, respectively. Attempted polymerizations of propene with catalysts generated in situ from rac-Et(1-Ind)2ZrMe2 and [H(OEt2)2][B(CF3)4], [Ph3C][B(CF3)4], or [Ph3C][B(CN)4] yielded only little to no polymer, possibly due to the low solubility of the catalysts in the reaction medium.

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