Ti(NMe₂)₄ and [HNMe₂Ph][B(C₆F₅)₄]: A Convenient Blend for Effective Catalytic Carboamination of Alkynes

Ti(NMe2)4, when combined with [HNMe2Ph][B(C6F5)4], catalyzes carboamination of alkynes with aldimines to form highly arylated α,β-unsaturated imines with exclusive (E,E)-configuration at the olefin and imine residues. Complexes [Ti(NHMe2)(NMe2)3][B(C6F5)4] and [TiNAr(NHMe2)3(NMe2)][B(C6F5)4] (Ar = 2,6-iPr2C6H3), isolated from stoichiometric reactions involving Ti(NMe2)4/[HNMe2Ph][B(C6F5)4] and Ti(NMe2)4/[HNMe2Ph][B(C6F5)4]/ArNH2, respectively, also catalyze carboamination with activity comparable to that of the Ti(NMe2)4/[HNMe2Ph][B(C6F5)4] system.