Patent ID: 7241898

Claim:
A compound of formula 1, wherein X and X′ each denote halogen; L denotes: a ligand of formula L 1 , L 2 , L 3 or L 4 , wherein R 5 and R 6 independently of one another denote H, C 1-6 -alkyl or aryl; R 7 and R 8 independently of one another denote H, C 1-6 -alkyl, C 2-6 -alkenyl or aryl; or R 7 and R 8 together form a 3 or 4-membered alkylene bridge; and Y and Y′ denote halogen; a, b, c, d independently of one another denote H, -NO 2 , C 1-12 -alkyl, C 1-12 -alkoxy or phenyl, wherein phenyl may optionally be substituted by a group selected from C 1-6 -alkyl and C 1-6 -alkoxy; R 1 denotes C 1-12 -alkyl, C 5-6 -cycloalkyl, C 7-18 -aralkyl or aryl; R 2 denotes H, C 1-12 -alkyl, C 5-6 -cycloalkyl, C 7-18 -aralkyl or aryl; and R 3 denotes H, C 1-20 -alkyl, C 2-20 -alkenyl, C 2-20 -alkynyl or aryl.