NCN TRIANIONIC PINCER COMPLEXES AS CATALYSTS FOR OLEFIN POLYMERIZATION AND ISOMERIZATION

摘要

A catalyst comprising a NCN pincer ligand group VI complex is capable of being used as an olefin polymerization or isomerization catalyst that does not require an expensive cocatalyst. The complex has the NCN pincer ligand in a trianionic form with the group VI in the +4 oxidation state and complexed to an anionic hydrocarbon group or the complex has the NCN pincer ligand in a dianionic form with the group VI in the +2 oxidation state. The complex is capable of initiating the polymerization of alkeneswithout an added activator. The presence of a water scavenger, such as triisobutylalurninurn, increases the catalytic activ ity. T he complex is capable of selectively isomerizing 1-alkenes to cis/trans 2-alkenes.