Titanium complexes incorporating bicyclic guanidinate ligands. Structure of a novel titanium–aluminium complex

Abstract

Synthetic routes to titanium complexes incorporating the bicyclic guanidinate, 1,3,4,6,7,8-hexahydro-2H-pyrimido[1,2-a]pyrimidinate, [hpp]⁻, are described; the first example of a chelating coordination mode for the [hpp]⁻ anion and the trimetallic complex [Me₂Al(hpp)₂TiCl₂·AlMe₃] containing [hpp]⁻ ligands that chelate to titanium and, in addition, bridge to an AlMe₂ unit via nitrogen are reported.