A Novel Homogeneous Lewis Acid Catalyst: Bistriflatedibenzotetramethyltetraazaannulenezirconium(IV) in a Cationic Form

The catalytic properties of bistriflatedibenzotetramethyltetraazaannulenezirconium(IV), [Zr(tmtaa)(OTf)2] a prototype of a novel class of organometallic Lewis acids capable of promoting aldol condensations and allylation reactions in fair to good yields have been disclosed.