| abstract |
A ligand defined by the formula ** Formula ** in which each of Ph1, Ph2, Ph3 and Ph4 is a phenyl group linked to a phosphorus atom, with the conditions that: i) at least one of Ph1, Ph2, Ph3 and Ph4 are substituted in the ortho position with a halogen selected from the group consisting of fluorine, bromine and chlorine; ii) at least one of Ph1, Ph2, Ph3 and Ph4 has only hydrogen bonded to each carbon in ortho position; and iii) R2 is selected from the group consisting of hydrogen, C1-20 hydrocarbyl and silyl. |