| abstract |
The present invention is directed to polymerization methods, comprising contacting a monomer with at least one mononuclear metal hydride, wherein the metal is selected from the group consisting of Cr, Mo, W, V, and Fe, or a combination thereof; provided that the metal hydride is not (ŋ5-C5Ph5)Cr(CO)3H. The invention is also directed to polymerization methods, comprising admixing a polymerization intermediate with a chain transfer catalyst, wherein the chain transfer catalyst comprises at least one mononuclear metalloradical, wherein the metal is selected from the group consisting of Cr, Mo, W, V, and Fe, or a combination thereof; provided that the chain transfer catalyst is not (ŋ5-C5Ph5)Cr(CO)3•, thereby forming a polymerization product. |