Aluminium-mediated Reductive Dimerization of Aromatic Dialdehydes

C3-Symmetric chiral trisimidazoline: the role of a third imidazoline and its application to the nitro Michael reaction and the α-amination of β-ketoesters

“…The filtrate was concentrated in vacuo, and the residue was purified by SiO 2 column chromatography (hexane/ AcOEt¼2/3) to give 7c (868.8 mg, 78%) as colorless solid. 1 19 . To a suspension of MnO 2 (2.76 g, 31.8 mmol) in 1,2-dichroloethane (11 mL) was added (5-(tert-butyl)-1,3-phenylene)dimethanol (7c) (617.2 mg, 3.18 mmol).…”