Methods for the Synthesis of the Diels−Alder Catalysts (ArO)2TiX2 (X = Cl, Br, I; Ar = 2-tert-Butyl-6-methylphenyl)

A procedure for converting titanium diethylamidos to the corresponding dihalides (Cl, Br, I) and a complementary method for converting titanium dichlorides into dibromides and diiodides are reported. These methods were utilized to synthesize a family of homogeneous and polymer-supported Diels−Alder catalysts with the general formula (ArO) 2 TiX 2 (X = Cl, Br, I; Ar = 2- tert -butyl-6-methylphenyl).