The reaction of cationic Pd(II) diimine complex [(N∧N)Pd(Me)(L)] [B(Arf)4] ((N∧N) = 2,3-bis(2,6-di- isopropylphenylimino)butane, Arf -3,5-(CF3) 2C6H3, L = Et2O) with methyl methacrylate results in 1,2-insertion regiochemistry that is opposite ofthat observed with methyl aery late. The enthalpy of activation for MMA insertion is 4 kcal/mol higher than that for the corresponding MA insertion. The MMA-inserted complex can be employed for ethene or 1-hexene homopolymerization and their alternating copolymerization with carbon monoxide. Further, the quasi-living nature of the polymerizations allows the synthesis of poly(hexene-b-hexeneZCO) and poly(ethene-bethene/CO) copolymers.
All Science Journal Classification (ASJC) codes
- Physical and Theoretical Chemistry
- Organic Chemistry
- Inorganic Chemistry