| abstract |
.he invention relates to a compound of formula (I) wherein X represents a lo w alkylen group, an arylene group or an alkarylene group, L1 has formula (II) wherein Y1 represents oxygen, sulphur or N-R17, R11, R12, R13, R14, R15, R16 , R17 independently represent hydrogen, alkyl or aryl, L2 has formula (III) wherein Y2 represents oxygen, sulphur or N-R27, R21, R22, R23, R24, R25, R26 , R27 independently represent hydrogen, alkyl or aryl wherein L1 and L2 can be identical or different. The inventive compound is suitable for use as a catalyst or for producing a catalyst system. |