Reaction of trimethylaluminium with main group hydroxides: a non-hydrolysis route to methylalumoxane

摘要

Reaction of AlMe3 with [(Bu-t)(2)Ga(mu -OH)](3) or Ph3EOH (E = Sn, Pb) yields catalytically active MAO, [MeAlO](n), along with (Bu-t)(2)GaMe and Ph3EMe, respectively, in contrast, the reaction with Ph3EOH (E = C, Si, Ge) yields [Me2Al(mu -OEPh3)](2); the formation of MAO is proposed to occur via hydroxide exchange and the formation of unstable [Me2Al(mu -OH)](n); the propensity towards alkane elimination versus hydroxide exchange is controlled by the relative Bronsted acidity of the main group hydroxide. [References: 23]