Concept explainers
(a)
To determine: A mechanism for the given reaction.
Interpretation: A mechanism for the given reaction is to be proposed.
Concept introduction: The chain growth
(b)
To determine: The first three steps in the
Interpretation: The first three steps in the
Concept introduction: The chain growth polymerization that includes a cation that provides a charge to a monomer unit is known as cationic polymerization. The monomer unit becomes reactive after the transference of a charge from this cationic species. One of the most popular Lewis acid is
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Organic Chemistry (9th Edition)
- The reaction of p-cresol with CH2=O resembles the reaction of phenol (PHOH) with CH2 = 0, except that the resulting polymer is thermoplastic but not thermosetting. Draw the structure of the polymer formed, and explain why the properties of these two polymers are so different. CH3 OH + CH2=0 p-cresolarrow_forwardDraw a structural formula of the polymer resulting from base-catalyzed polymerization of each compound. Would you expect the polymers to be optically active? (S)-(+)-lactide is the dilactone formed from two molecules of (S)-(+)-lactic acid.arrow_forwardCationic polymerization of alkenes is initiated by H* to form carbocations. An unstable alkane yields a very exothermic reaction during its hydrogenation. O Both statements are true. O Both statements are false. O Only the first statement is true. O Only the second statement is true. Which of the following is the major product from the given reaction below? O O HO HO. HO OH OH H₂O H₂SO4arrow_forward
- 11-15. The reaction below is an example of condensation polymerization of PET. Fill in the missing com- pound to complete the structure. - C,H,- + - CH,-0-H H- ноосс, н, соон Terephthalic acid HOC,H,OH Ethane-1,2-diol (A dicarboxylic acid) (A diol) Condensation polymerisation Ester link - C,H, + но fom Repeating unit of a polyesterarrow_forwardTwo reactions have an error. Circle the reactions that contain mistakes. Explain why. HCI ROOR polymerization t NBS hv Br HBr NMO NaOEt OET ملاarrow_forward4. The following reaction scheme shows the radical polymerization of styrene to make polystyrene. a) Add electron-pushing arrows to show the mechanisms of steps 1-3. Determine if these are initiation, propagation, or termination steps. b) Radical polymerization is often performed in the absence of O2 because the oxygen radical can couple with the polymer radical to terminate polymerization. Propose electron-pushing arrows for step 4 and predict the product of that step. 1 hv 3 BzO Bzof *0-0° step 3 keeps happening until a termination step 4 OCcurs 2.arrow_forward
- 2. Given the initiators shown below, what type of radical polymerization will be the target process for each species? CH3 S iPr CH3 NC. C-O-0-H H3C N' iPr CH3 Ме tBu A Carrow_forward3. Which of the following could be polymerized by cationic or anionic chain polymerization(or both or neither)? CN Ph он co,CH, Doarrow_forward4. The following reaction scheme shows the radical polymerization of styrene to make polystyrene. a) Add electron-pushing arrows to show the mechanisms of steps 1-3. Determine if these are initiation, propagation, or termination steps. b) Radical polymerization is often performed in the absence of O2 because the oxygen radical can couple with the polymer radical to terminate polymerization. Propose electron-pushing arrows for step 4 and predict the product of that step.arrow_forward
- Four sets of monomers are shown below. Which set A through D will lead to a polymer that is noticeably different from the others with respect to branching? Click on a letter A through D to answer. он H,N, но но `NH2 A он но но он OH OH он но ноarrow_forwardTreatment of the polymer shown below with aqueous 6 molar hydrochlorlc add at 80 *C leads to which products? Check the correct answer. HN O 1.1,6-Hexanediol, carbon dioxide, and the dihydrochloride of the aromatic diamine. O2 Adisocyanate and 1,6-hexanediol. O 3. 1,6-Hexanediol, phosgene (COCI,), and the dihydrochloride of the aromatic diamine. 0 4. The aromatic dlamine, urethane, and 1,6-hexanediol.arrow_forwardBoth monomers needed for the synthesis of Nylon 6,6 can be prepared from 1,4- dichlorobutane. How would you prepare the two monomers from 1,4-dichlobutane? Don't forget to show the product from each step of the synthesis. ????? ????? H₂N HO NH₂ eyou OHarrow_forward
- Organic ChemistryChemistryISBN:9781305580350Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. FootePublisher:Cengage Learning