Patent ID: 7109344

Claim:
A compound of formula 1, wherein: X 1 and X 2 are anionic ligands; L 1 is a neutral ligand; R 1 is —C 1-20 -alkyl, —C 1-20 -haloalkyl, —C 3-8 -cycloalkyl or —C 7-13 -aralkyl; R 2 is H, —C 1-20 -alkyl, —C 2-20 -alkenyl, —C 2-20 -alkynyl or aryl; R 3 is —C 1-6 alkyl, —C 1-6 -alkoxy, aryl, F or Cl; n is 0, 1, 2 or 3; Z is —CO—R 4 , —SO 2 —R 5 or —PO(R 6 ) 2 ; R 4 is —C 1-20 -alkyl or —C 3-8 -cycloalkyl, both optionally substituted by one or more groups each independently selected from F, Cl, Br, I or —C 1-6 alkoxycarbonyl, or aryl or heteroaryl both optionally substituted by one or more group selected from each independently F, Cl, Br, I, —C 1-6 -alkyl, —C 1-6 alkoxy, —NO 2 , —CN, —CF 3 , —OCF 3 or —C 1-6 -alkoxycarbonyl; R 5 is —C 1-8 -fluoroalkyl, aryl or heteroaryl, wherein aryl or heteroaryl are both optionally substituted by one or more groups each independently selected from F, Cl, Br, I, —C 1-6 -alkyl, —C 1-6 alkenyl, —C 1-6 -alkoxy, —NO 2 , —CN, —CF 3 , —OCF 3 , —C 1-6 -alkoxycarbonyl, —SO 2 —C 1-6 -alkyl or —SO 2 -aryl; and R 6 are each independently —C 1-20 -alkyl, —C 3-8 -cycloalkyl, aryl or heteroaryl, wherein aryl or heteroaryl are both optionally substituted by one or more group each independently selected from F, Cl, Br, I, —C 1-6 alkyl, —C 1-6 alkoxy, —NO 2 , —CN, —CF 3 , —OCF 3 , or —C 1-6 -alkoxycarbonyl; or R 4 , R 5 and R 6 are each independently a group of formula 1′ wherein X 1′ and X 2′ are anionic ligands; L 1′ is a neutral ligand; R 1′ is —C 1-20 -alkyl, —C 1-20 -haloalkyl, —C 3-8 -cycloalkyl or —C 7-13 -aralkyl; R 2′ is H, —C 1-20 -alkyl, —C 2-20 -alkenyl, —C 2-20 -alkynyl or aryl; R 3′ is —C 1-6 alkyl, —C 1-6 -alkoxy, aryl, F or Cl; and n′ is 0, 1, 2 or 3.