chloro-trimethyl-silane; Ti(iso-propylate)[(tris(2-hydroxy-3,5-dimethylbenzyl)amine)(-3H)]; cyclohexa-1,4-diene; magnesium in tetrahydrofuran T=40 - 50°C; 12 h; Inert atmosphere; Reagent/catalyst; regioselective reaction;