Chiral cyclopentadienyl ruthenium(II) complexes with P,P-ligands derived from (1R,2R)-1,2-diaminocyclohexane: Synthesis, crystal structures and catalytic activity in Diels-Alder reactions

Chiral cyclopentadienyl ruthenium(II) complexes [CpRu(L1-L3)Cl] (5-7) have been prepared by reaction of [CpRu(PPh3)2Cl] with chiral P,P-ligands (1R,2R)-1,2-bis(diphenylphosphinamino)cyclohexane (L1), N,N′-[bis-(3,3′-bis-tert-butyl-5,5′-bis-methoxy-1, 1′-biphenyl-2,2′-diyl)phosphite]-(1R,2R)-1,2-diaminocyclohexane (L2) and N,N′-[bis-(R)-1,1′-binaphtyl-2,2′-diyl)phosphite]-(1R,2R) -1,2-diaminocyclohexane (L3). The molecular structures of 5 and 6 have been determined by single-crystal X-ray analysis. Studies on catalytic activity of the cations derived from (5-7) by treatment with AgSbF6, are also reported. © 2010 Elsevier Ltd. All rights reserved.