Question

6. Write chemical reactions for a generalized mechanism of a Ziegler-Natta polymerization of ethylene using TiCl/AICIEt 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

Answer to the broblem 9 . Zieglan-Natta catalyst Tiela 1 Alezet el - or a) Monomer Co-ordinates to metal centrer: Et Ti ev a Et ft Ti et dl -Ti 1 i Ethylene De 외 뇨 그래도면 6 chain Growin: nel # H ها را a -71 (etty) CH3 + F a ti - (etty) CHz c) Termination through transfer reaction with monomer a el ti et CH - (CH) un 1 - Ctq = CH - (CH2) - TH

& Termination through B-hydrogen elimination ин; - CAH= 24 — (42) + e-Ti-H