RESUMO
The combination of ZnEt(2) and chiral pyridinebisoxazoline (pybox) or pyridinebisimidazoline (pybim) ligands catalyzed the asymmetric hydrosilylation of aryl, alkyl, cyclic, heterocyclic, and aliphatic ketones. Under mild conditions, high yields and good enantioselectivities were achieved. ESI measurements allowed for the characterization of the active catalyst.
Assuntos
Imidazolinas/química , Cetonas/química , Ligantes , Oxazóis/química , Piridinas/química , Água/química , Zinco/química , Catálise , Estrutura Molecular , Espectrometria de Massas por Ionização por Electrospray , EstereoisomerismoRESUMO
The commercially available title compound, C(25)H(23)N(3)O(2), has been known since 1993 [Nesper et al. (1993 â¶). Helv. Chim. Acta, 76, 2239-2249], but has not been structurally characterized until now. In the free ligand, the N atoms of both oxazoline rings point in opposite directions. The phenyl rings make dihedral angles of 30.56â (5) and 84.57â (3)° with the pyridine ring and 72.85â (3)° with each other.
