Patent ID: 8288558

Claim:
A compound of the general formula 1, wherein X and Xâ€² are anionic ligands; L is a ligand of the formula L l , L 2 , L 3 or L 4 or L is a ligand of the formula P(R 4 ) 3 , where R 4 is C 1-6 -alkyl, cycloalkyl or aryl; a, b, c, d are each, independently of one another, H, â€”NO 2 , C 1-12 -alkyl, C 1-12 -alkoxy or phenyl, where phenyl may be substituted by a radical selected from the group consisting of C 1-6 -alkyl and C 1-6 -alkoxy; R 1 is C 1-12 -alkyl, C 5-6 -cycloalkyl, C 7-18 -aralkyl, or aryl; R 2 is H, C 1-12 -alkyl, C 5-6 -cycloalkyl, C 7-18 -aralkyl, or aryl; R 3 is H, C 2-12 -alkenyl, C 2-12 -alkynyl, or aryl; R 5 and R 6 are each, independently of one another, H, C 1-6 -alkyl or aryl; R 7 and R 8 are each, independently of one another, H, C 2-6 -alkenyl or aryl; or R 7 and R 8 together form a 3- or 4-membered alkylene bridge; and Y and Yâ€² are each halogen.