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

Abstract

Chiral cyclopentadienyl ruthenium(II) complexes [CpRu( L1– L3)Cl] ( 5– 7) have been prepared by reaction of [CpRu(PPh 3) 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 AgSbF 6, are also reported.