Patent ID: 6136748
Filing Date: 2000-10-24
Classification: C07F,C08F

Abstract:
A catalyst precursor comprising a metal atom complexed with a non-cycloalkadienyl anionic ligand selected from the group consisting of(a) a ligand having the formula: ##STR16## wherein R.sub.1, R.sub.2 and R.sub.3 are each independently selected from the group consisting of alkyl, aryl, heterocyclic groups, and hydrogen, wherein any pair of moieties selected from R.sub.1, R.sub.2, and R.sub.3 may be joined together to form a cyclic alkyl, heterocyclic ring or aromatic ring; and R.sub.4 -R.sub.7 are each independently selected from the group consisting of alkyl, aryl and hydrogen; and(b) a ligand having the formula: ##STR17## wherein R.sub.1 and R.sub.2 are each independently selected from the group consisting of alkyl, aryl, heterocyclic groups, and hydrogen; R.sub.3 and R.sub.4 are each independently selected from the group consisting of alkyl, aryl, and hydrogen,wherein the chemical hardness, .eta., and chemical potential, .mu., of said non-cycloalkadienyl anionic ligand calculated using the MO(PM3) computer program satisfy the relationship: .eta.=3.0+0.75.mu..+-.0.2 eV.