Chain-walking polymerization of 3-heptene with phenyl substituted alpha-diimine nickel catalysts

摘要

The first example of a 3-alkene polymerization has been successfully achieved with 3-heptene in the presence of phenyl-substituted alpha-diimine nickel precatalysts activated by dMMAO, and compared with the corresponding linear alkenes, i.e., 1-pentene, 2-hexene and 4-octene polymerizations. The microstructures of the produced poly (3-heptene), which consists of ethyl, propyl and butyl branches indicated the 3,4- and 4,3-insertion, followed by chain-walking, with incorporation of a small fraction of long methylene sequences of 1,7-enchainment via monomer-isomerization.