Oligomerization of styrenes mediated by cationic allyl nickel complexes containing triphenylstibine or triphenylarsine†
Abstract
The cationic complexes [Ni(η3-CH2C(R)CH2)(SbPh3)3][BAr′4] (R = CH31a, H 1b; Ar′ = 3,5-C6H3(CF3)2), [Ni(η3-CH2C(R)CH2)(AsPh3)2][BAr′4] (R = CH32a, H 2b), [Ni(η3-CH2CHCH2)(PPh3)(L)][BAr′4] (L = SbPh33, AsPh34), and the neutral derivatives [Ni(η3-CH2C(R)CH2)Br(L)] (L = SbPh3, R = CH35a, H 5b; L = AsPh3, R = CH36a, H 6b) have been prepared and characterized. The X-ray crystal structures of 1a-b, 2b, 3, 5a and 6b have been determined. These complexes are very active CH2 to mainly dimers and trimers of