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 dimethyl group 4 complexes with generation of weakly associated ion pairs, which are active catalysts for the polymerization of olefins.
Complexes of tris(pentafluorophenyl)boron with nitrogen-containing compounds : Synthesis, reactivity and metallocene activation / F. Focante, P. Mercandelli, A. Sironi, L. Resconi. - In: COORDINATION CHEMISTRY REVIEWS. - ISSN 0010-8545. - 250:1-2(2006), pp. 170-188. [10.1016/j.ccr.2005.05.005]
Complexes of tris(pentafluorophenyl)boron with nitrogen-containing compounds : Synthesis, reactivity and metallocene activation
P. MercandelliSecondo
;A. SironiPenultimo
;
2006
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 dimethyl group 4 complexes with generation of weakly associated ion pairs, which are active catalysts for the polymerization of olefins.
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