title: Asymmetric hydrosilylation of ketones catalyzed by complexes formed fromtrans-diaminocyclohexane-based diamines and diethylzinc.
abstract: Chiral acyclic and macrocyclic amines derived fromtrans-1,2-diaminocyclohexane in complexes with diethylzinc efficiently catalyze asymmetric hydrosilylation of aryl-alkyl and aryl-aryl ketones with enantiomeric excess of the product up to 86 %. A trianglamine ligand with a cyclic structure or the presence of an additional coordinating group increases the enantioselectivity of the reaction, in comparison with catalysis by a simple acyclicN,N'-dibenzyl-1,2-diaminocyclohexane ligand. In addition, the effect of the asymmetric activation of the catalyst by a variety of alcohols and diols is studied.
authors.affiliation: Department of Chemistry, A. Mickiewicz University, 60-780 Poznan, Poland.
authors.forename: Jadwiga
authors.initials: J
authors.lastname: Gajewy
authors.affiliation: Department of Chemistry, A. Mickiewicz University, 60-780 Poznan, Poland.
authors.forename: Jacek
authors.initials: J
authors.lastname: Gawronski
authors.affiliation: Department of Chemistry, A. Mickiewicz University, 60-780 Poznan, Poland.
authors.forename: Marcin
authors.initials: M
authors.lastname: Kwit
keywords: Asymmetric activation; Homogeneous catalysis; Ligands; Macrocycles; Metal complexes; Zinc