ABSTRACT
Block Monomer Sequences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 407 15.4 Copolymerization of Propylene and Cyclopentene with Transition Metal Catalysts . . . . . 409 15.5 Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 410 References and Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 410
Cyclopentene (CPE) is obtained from one of the C5 fractions of cyclopentadiene, which is a subproduct of cracking naphtha. CPE is prepared by partial hydrogenation of cyclopentadiene or reduction of cyclopentadiene by sodium in liquid nitrogen. CPE is a unique olefin that, owing to its diverse insertion modes, can be polymerized with various transition metal catalysts. Figure 15.1 shows the four types of CPE polymerization insertion and enchainment modes: 1,2-cis-enchainment, 1,2-trans-enchainment, 1,3-cis-enchainment, and 1,3-trans-enchainment.
