Journal
COORDINATION CHEMISTRY REVIEWS
Volume 250, Issue 1-2, Pages 170-188Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ccr.2005.05.005
Keywords
perfluoroarylboranes; boron-nitrogen complexes; Lewis acid-Lewis base adducts; metallocenes; ion pairs
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The strong Lewis acid tris(pentafluorophenyl)boron, B(C6F5)(3), reacts with several nitrogen-containing Lewis bases (nitriles, amines, imines, pyridines, etc.) and also with non-basic substrates (such as pyrroles and indoles) producing in both cases the B-N coordination adduct. With particular substrates (some tertiary amines, the imine 'Bu(Me)C=NBn, N-methyl-pyrrole and -indole,) the 1:1 borane/N-compound reaction produces zwitterions where a new B-C bond is generated. Some of the borane-N-compound adducts present Bronsted acidity and can be reacted with di-methyl group 4 complexes with generation of weakly associated ion pairs, which are active catalysts for the polymerization of olefins. (c) 2005 Elsevier B.V. All rights reserved.
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