| abstract |
A new P-N-P ligand having the general formula (Ph 1 )(Ph 2 )P-N-P(Ph 3 )(Ph 4 ) R 2 wherein each Of Ph 1 , Ph 2 , Ph 3 and Ph 4 is a phenyl group bonded to a phosphorus group, and R 2 is selected from the group consisting of hydrogen, C 1-20 hydrocarbyl and silyl is useful in ethylene trimerization. In combination with i) a source of chromium and ii) an activator such as methylalumoxane, the ligand of this invention may be used to prepare an oligomer product that contains a mixture of hexenes and octenes The hexenes and octenes produced with this ligand contain very low levels of internal olefins when produced under preferred reaction conditions |