A selective synthesis of hydroxyborate anions as novel anchors for zirconocene catalysts.
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.
Bibal
Christine
C
Université de Lyon, ICL, LC2P2, Laboratoire de Chimie Organométallique de Surface, UMR 5265 CNRS-ESCPE Lyon, 43, bd du 11 Novembre 1918, 69626, Villeurbanne Cedex, France.
Santini
Catherine C
CC
Chauvin
Yves
Y
Vallée
Christophe
C
Olivier-Bourbigou
Hélène
H
D000838:Anions / Q000138:chemical synthesis / Q000737:chemistry; D001881:Borates / Q000138:chemical synthesis* / Q000737:chemistry; D002384:Catalysis; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D015040:Zirconium / Q000737:chemistry
D000838:Anions; D001881:Borates; D009942:Organometallic Compounds; C023398:Zirconocene dichloride; D015040:Zirconium