Patent ID: 7101940

Claim:
A chemical compound of formula I, where M 1 is boron, x is 4, y is 2, A is nitrogen, R 1 are identical or different and are each C 6 –C 40 -haloaryl, C 6 –C 40 -aryloxy, C 7 –C 40 -arylalkyl, C 7 –C 40 -haloarylalkyl, C 7 –C 40 -haloalkylaryl or C 4 –C 40 -cycloalkyl, R 2 are identical or different and are each C 1 –C 6 -alkyl, R 3 is C 7 –C 20 -arylalkyl, and R 4 is a hydrogen atom.