Cationic (eta(6)-p-cymene) ruthenium(II) and (eta(5)-C5Me5) rhodium(III) complexes containing chiral chelate P,N ligands (1R,2R)-N-1-(4,8-di-tert-butyl-2,10-dimethoxydibenzo[d,f][1,3,2]dioxaphosphepin-6-yl)-N-1,N-2-dialkylcyclohexane-1,2-diamine (alkyl = Me L1, Et L2) have been synthesized and characterized by multinuclear one- and two-dimensional NMR spectroscopy, conductivity measurements, mass spectroscopy and elemental analysis. In the case of the ruthenium complexes [Ru(eta(6)-p-cymene) (kappa-P,kappa-N)-(L1-L2)Cl]SbF6 1-2, the diastereomer having an S-Ru configuration was formed with a de >= 98%. For rhodium complexes [Rh(eta(5)-C5Me5)(kappa-P,kappa-N)-(L1-L2)Cl]SbF6 3-4, the stereoselectivity of the chelation process and the configurational stability of the complexes depend on the reaction conditions and N-substituent of amino nitrogen. Some of these complexes have been tested as precatalysts in the asymmetric transfer hydrogenation of acetophenone by propan-2-ol.

Half-sandwich ruthenium(II) and rhodium(III) complexes bearing chiral amino-phosphoramidite ligands: Synthesis, characterization and application in asymmetric transfer hydrogenation of acetophenone

DROMMI, Dario;ARENA, Carmela
2012-01-01

Abstract

Cationic (eta(6)-p-cymene) ruthenium(II) and (eta(5)-C5Me5) rhodium(III) complexes containing chiral chelate P,N ligands (1R,2R)-N-1-(4,8-di-tert-butyl-2,10-dimethoxydibenzo[d,f][1,3,2]dioxaphosphepin-6-yl)-N-1,N-2-dialkylcyclohexane-1,2-diamine (alkyl = Me L1, Et L2) have been synthesized and characterized by multinuclear one- and two-dimensional NMR spectroscopy, conductivity measurements, mass spectroscopy and elemental analysis. In the case of the ruthenium complexes [Ru(eta(6)-p-cymene) (kappa-P,kappa-N)-(L1-L2)Cl]SbF6 1-2, the diastereomer having an S-Ru configuration was formed with a de >= 98%. For rhodium complexes [Rh(eta(5)-C5Me5)(kappa-P,kappa-N)-(L1-L2)Cl]SbF6 3-4, the stereoselectivity of the chelation process and the configurational stability of the complexes depend on the reaction conditions and N-substituent of amino nitrogen. Some of these complexes have been tested as precatalysts in the asymmetric transfer hydrogenation of acetophenone by propan-2-ol.
2012
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11570/3103406
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 4
  • ???jsp.display-item.citation.isi??? 4
social impact