Abstract
Novel Cr(III) catalysts supported by linear phosph(III)azanes of the type (RRN)-R-1-N-2-P(Ph)-NR3-P(Ph)-(NRR5)-R-4 have been prepared, all of which, upon activation with MMAO-3A, are highly active for ethene tri-/tetramerization with considerable selectivity. The effect of ligand substitution as well as solvent on the catalytic performance has been examined.