Question

6. Write chemical reactions for a generalized mechanism of a Ziegler-Natta polymerization of ethylene using TiCl4/AlCl2Et as the catalyst/co-catalyst for each of the following steps (curved arrows are not necessary): a. Monomer coordinates to the metal center b. Chain growth proceeds through the addition of further monomers by migratory insertion c. Termination occurs by a transfer reaction with the monomer, or d. Termination occurs by B-hydrogen elimination

Answer 1

- Al Etat a I e-the - to - ce-li -> Activation of zugier- Natta Catalyst system by coscination to ů arom ce - Te - Monomer wordination to metal center Et ---4-CH3 ce Et e H3 a Ti + 1 u 93 i l cha cu IVO ery insertion Chain pureeding By monomer attaching CH2=CH-CH3 ce - CH2 - CH CH3

내 Wg에 동 -- 내 3 Repeat le 내내 umo - o -3 | 0 - Terminantion Step by B-elimination H3 H, 고 내 TiH Termination Step by H-Transfer to monomer 대 내 > F x +1 U V Ho-Uhom Holllll 내3