ring-opening metathesis polymerization (ROMP) of the norbornene 7. a. Write chemical reactions for the ring-opening metathesis...
(21) 3. Consider the Ring Opening Metathesis Polymerization method: the initiating system in ring opening metathesis polymerization reactions. ring opening metathesis polymerization reactions. (C) Formulate a detailed mechanism for the ring opening metathesis polymerization reaction. (d) What is the major polymer product formed in the reaction of cyclopentene with the WCI/AIEt catalyst system? (e) Formulate a detailed reaction pathway for the reaction of cyclopentene with MoCls/AlEts catalyst system and draw the structure of the polymer product. (1) What is the...
Draw a simple mechanism for condensation polymerization and ring opening polymerization.
4. Draw the product of the following Grubbs Ring ring opening metathesis, where compound 29 is Grubb's catalyst. (4) CR 10 equiv. niwolontho 29 (xx mol %) HOV DCM, 22 °C
Explain the history of Ring opening Polymerization of ϵ-Caprolactone. describe about background..
b. As was shown for cationic polymerization reactions, a depolymerization reaction referred to as "back-biting" can also occur during ROMP. Propose a mechanism for this depolymerization reaction using your structure from part a. You may use an abbreviated structure to simplify the drawing.
6a (6 pts) Under the right conditions, ring opening of epoxides can form a polymerization. Draw the structure of the formed polymer using polymer notation in the box, and show the mechanism of initation and addition of two monomers below the reaction scheme. NaOMe 2 mmol 44 mmol b. (1 point) with the stoichiometry indicated above, what would "n" be equal to in the polymer? / 13 pts
Practice Problem: 1- Give one product of electrocyclic ring closure or ring opening reactions of the following compounds? OME OMe C=
6. Cationic ring-opening polymerization of (S)-3- methyltetrahydrofuran with a catalytic amount of chlorosulfonic acid (HSO3CI) yields a low-molecular weight polymer chain. Draw a reasonable mechanism for the growth of this polymer; show at least 3 monomers reacting with each other. Explain why an SN2 or SN1 reaction mechanism is more likely. HSO3CI
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
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