In this study, N-coordinated 3, 4-dihydroquinazoline ruthenium (II) complexes were synthesized by the cleavage reaction of [RuCl2 (p-cymene)] 2 with N-substituted 3, 4- dihydroquinazolines. In addition, the X-ray crystal structure of 2, 4, 6-trimethylbenzyl substituted 3, 4-dihydroquinazoline Ru (II) complex (1a) is reported. Furthermore, the resulting piano–stool complexes were evaluated as transfer hydrogenation catalysts for ...