| abstract |
A bridged bi-aromatic phenol ligand of formula (I); ** Formula ** wherein each of R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11 and R12 is selected independently of the group consisting of hydride, halide, optionally substituted hydrocarbyl, optionally substituted hydrocarbyl containing heteroatoms, alkoxy, aryloxy, silyl, boryl, dialkylamino, alkylthio, arylthio and selene; optionally two or more R groups can be combined with each other into ring structures, such ring structures having from 3 to 100 non-hydrogen ring atoms; A is a bridging group having from one to 50 non-hydrogen atoms; Y and Y 'are independently selected from O, S, NRa and PRa, where Ra is optionally substituted hydrocarbyl; Ar is, independently, optionally substituted aryl or optionally substituted heteroaryl. |