title: Oligomerization of styrenes mediated by cationic allyl nickel complexes containing triphenylstibine or triphenylarsine.
abstract: The cationic complexes [Ni(eta(3)-CH(2)C(R)CH(2))(SbPh(3))(3)][BAr'(4)] (R = CH(3), H ; Ar' = 3,5-C(6)H(3)(CF(3))(2)), [Ni(eta(3)-CH(2)C(R)CH(2))(AsPh(3))(2)][BAr'(4)] (R = CH(3), H ), [Ni(eta(3)-CH(2)CHCH(2))(PPh(3))(L)][BAr'(4)] (L = SbPh(3), AsPh(3)), and the neutral derivatives [Ni(eta(3)-CH(2)C(R)CH(2))Br(L)] (L = SbPh(3), R = CH(3), H ; L = AsPh(3), R = CH(3), H ) have been prepared and characterized. The X-ray crystal structures of , , , and have been determined. These complexes are very active catalyst precursors for the low-molecular weight oligomerization of RC(6)H(4)CH[double bond, length as m-dash]CH(2) to mainly dimers and trimers of styrene (R = H) or 4-methylstyrene (R = CH(3)). They also catalyse the oligomerization of alpha-methylstyrene to dimers and trimers, or to higher oligomers depending upon the reaction conditions (solvent and temperature). The oligomerization reactions were carried out at 25 degrees C in most cases, in dichloromethane, 1,2-dichloroethane or fluorobenzene, using a olefin/catalyst ratio equal to 2000. The oligomerization products were characterised by means of GPC/SEC.
authors.affiliation: Departamento de Ciencia de Materiales e Ingeniería Metalúrgica y Química Inorgánica, Facultad de Ciencias, Universidad de Cádiz, 11510, Puerto Real, Cádiz, Spain. manuel.tenorio@uca.es
authors.forename: Manuel
authors.initials: M
authors.lastname: Jiménez-Tenorio
authors.forename: M
authors.initials: M
authors.lastname: Carmen Puerta
authors.forename: Isabel
authors.initials: I
authors.lastname: Salcedo
authors.forename: Pedro
authors.initials: P
authors.lastname: Valerga
authors.forename: Isaac
authors.initials: I
authors.lastname: de Los Ríos
authors.forename: Kurt
authors.initials: K
authors.lastname: Mereiter