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. 2008 Jun 7:(21):2866-70.
doi: 10.1039/b718057h. Epub 2008 Apr 17.

A selective synthesis of hydroxyborate anions as novel anchors for zirconocene catalysts

Christine Bibal  1 , Catherine C Santini, Yves Chauvin, Christophe Vallée, Hélène Olivier-Bourbigou
Affiliations

A selective synthesis of hydroxyborate anions as novel anchors for zirconocene catalysts

Christine Bibal et al. Dalton Trans. .

Abstract

A new family of hydroxytris(pentafluorophenyl)borate anions [B(C6F5)3OH](-) associated with organic and aprotic cations c+ (imidazolium, pyrrolidinium and phosphonium) has been prepared by a general one-pot synthesis that implies the chloride borate analogues [B(C6F5)3Cl](-)[c]+. The [c]+[B(C6F5)3OH](-) salts have been isolated and fully characterized. The borate anion [B(C6F5)3OH](-) has been shown to protonate the Zr-Me bond in the Cp2ZrMe2 complex forming CH4 and the first published example of anionic [Cp2Zr(Me)OB(C6F5)3](-) species. Standard spectroscopic methods demonstrate the covalent character of the Zr metal center and the anionic character of the boron atom. This protonolysis methodology using [B(C6F5)3OH](-) anion affords a new route for the incorporation of a covalently bonded anionic functionality on organometallic complexes. This provides a new way to immobilize transition metal complexes in ionic liquids.

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