| Abstract
| - A series of chromium complexes having bis(diphenylphosphino)amine ligands with a donor group attached to the nitrogen linker have been prepared. These provide precursors to highly active, relatively stable, and selective catalysts for trimerization and tetramerization of ethylene. Furthermore, the use of chlorobenzene solvent (rather than toluene) significantly improves productivity, stability, and selectitvity.
- A series of bis(diphenylphosphino)amine ligands with a donor group attached to the nitrogen linkerhave been prepared. Metalation of these ligands with chromium trichloride provides precursors to highlyactive, relatively stable, and selective catalysts for trimerization and tetramerization of ethylene. It hasbeen demonstrated in oligomerization reactions performed at 1 and 4 atm of ethylene that these newsystems increase total productivity by enhancing catalyst stability, as compared with those lacking adonor group on the diphosphine ligand. Furthermore, the use of chlorobenzene solvent (rather than toluene)significantly improves productivity, stability, and selectitvity. The product distributions and minorbyproducts provide information relevant to mechanistic issues surrounding these types of reactions.
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