| abstract |
ADDITION POLYMERIZATION CATALYSTS OF THE FORMULA L MX+ A-PREPARED BY OXIDATION OF A GROUP 4 OR LANTHANIDE METAL DERIVATIVE OF THE FORMULA L MX2 WITH AN OXIDIZING AGENT OF THE FORMULA (OX+2)B(A-)D ARE FREE OF INTERFERING AMINE OR PHOSPHINE BYPRODUCTS. IN THESE FORMULAE:-L INDEPENDENTLY EACH OCCURENCE IS A LIGAND OR LIGAND SYSTEM, ESPECIALLY A 5-CYCLOPENTADIENYL GROUP OPTIONALLY COVALENTLY BONDEDTO M THROUG A SUBSTITUENT;IS AN INTEGER, ESPECIALLY 1;M IS A GROUP 4 OR THE LANTHANIDE METAL, ESPECIALLY TITANIUM OR ZIRCONIUM;X IS HYDRIDE OR A HYDROCARBYL, SILYL OR GERMYL GROUP HAVING UP TO 20 CARBON, SILICON OR GERMANIUM ATOMS, ESPECIALLY BENZYL;A- IS A MONOVALENT, COMPATIBLE, NONCOORDINATING ANION, ESPECIALLY PERFLUOROTETRAPHENYL BORATE;OX+2 IS A CATIONIC OXIDIZER HAVING A CHARGE OF (+A),ESPECIALLY AG+ OR FERROCENIUM; AND B AND D ARE INTEGERS SELECTED TO PROVIDE CHARGE BALANCE. |