F. Focante, P. Mercandelli, A. Sironi
2006
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Coordination Chemistry Reviews
Abstract
Abstract 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 tBu(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.