3.2 Propose a mechanism for the polymerisation of styrene (CH2=CHPh) with nBuLi,followed by CO2 addition.

To propose a mechanism for the polymerization of styrene (CH₂=CHPh) with n-butyllithium (nBuLi)…

Answered: 3.2 Propose a mechanism for the…

Organic Chemistry

8th Edition

ISBN:9781305580350

Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Publisher:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Chapter29: Organic Polymer Chemistry

Section29.5: Step-growth Polymerizations

Problem 29.2P

See similar textbooks

Similar questions

(a) Draw the structure of the prepolymer A formed from 1,4-dihydroxybenzene and excess epichlorohydrin. (b) Draw the structure of the cross-linked polymer B formed when A is treated with H2NCH2CH2CH2NH2 as the hardening agent.
a) Draw the structure of the prepolymer A formed from 1,4 dihydroxybenzene and excess epichlorohydrin. (b) Draw the structure of the cross-linked polymer B formed when A is treated with H2NCH2CH2CH2NH2 as the hardening agent.
11. Draw the repeating segment for the polymer formed from the reactions using the given monomer(s). (a) H₂C=CH₂ (b) CICH₂CH₂OCH₂CH₂CI+ (c) O=C=N- TICI4 (CH3CH₂)2AICI (d) HO- CH3 CH3 N. H -N=C=O + HOCH₂CH₂OH OH + & amine
Draw a stepwise mechanism for the polymerization of isoprene to guttapercha using (CH3)3CO–OC(CH3)3 as the initiator.
(19) Explain the following polymerization mechanism by showing propagation reactions with the catalyst three times (draw chemical structures of the intermediates of the first, second, and third reaction with the monomer and catalysts). R LnW=CHR' taadd R (2) Why is HT-3-hexyl polythiophene better in conductivity than other regioisomers? Explain the reasons from the intramolecular and intermolecular aspects, respectively.
Cationic polymerization of 3-phenylpropene (CH2 = CHCH2Ph) affords A as the major product rather than B. Draw a stepwise mechanism to account for this observation.
(a) Draw the structure of the prepolymer A formed from 1,4-dihydroxybenzene and excess epichlorohydrin. (b) Draw the structure of the cross-linked polymer B formed when A is treated with H2NCH2CH2CH2NH2 as the hardening agent.
A3 Anionic polymerization of styrene is generally known to produce polymers with a narrow molecular weight distribution. Explain the reason for this.
Chain branching is not as common with anionic polymerization as it is with free-radical polymerization and cationic polymerization. Propose a mechanism for chain branching in the polymerization of acrylonitrile.
One common type of cation exchange resin is prepared by polymerization of a mixture containing styrene and 1,4-divinylbenzene . The polymer is then treated with concentrated sulfuric acid to sulfonate a majority of the aromatic rings in the polymer. Q.) Show the product of sulfonation of each benzene ring.
Polycarbophil is a dietary fiber supplement. It is the calcium salt of a copolymer of acrylic acid and divinyl glycol, a cross-linking agent. In the stomach, the calcium ions exchange for protons and, in the higher pH of the intestine, the polymer absorbs 70 times its mass in ОН OH Divinyl glycol water. (a) Propose a structure for polycarbophil. (b) Why is cross-linking of the polymer necessary for this application? (c) Why is polycarbophil effective at providing bulk in the intestine? That is, what occurs on a molecular level to polycarbophil?
i) Explain why polypropylene is mainly produced by the coordination polymerization, but not by the free radical, anionic, and cationic polymerizations. ii) Write reaction mechanism to account for the formation of polypropylene by the coordination polymerization.

SEE MORE QUESTIONS

Recommended textbooks for you

Organic Chemistry

Chemistry

ISBN:

9781305580350

Author:

William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Publisher:

Cengage Learning

Organic Chemistry

Chemistry

ISBN:

9781305080485

Author:

John E. McMurry

Publisher:

Cengage Learning

EBK A SMALL SCALE APPROACH TO ORGANIC L

Chemistry

ISBN:

9781305446021

Author:

Lampman

Publisher:

CENGAGE LEARNING - CONSIGNMENT

Organic Chemistry

Chemistry

ISBN:

9781305580350

Author:

William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Publisher:

Cengage Learning

Organic Chemistry

Chemistry

ISBN:

9781305080485

Author:

John E. McMurry

Publisher:

Cengage Learning

EBK A SMALL SCALE APPROACH TO ORGANIC L

Chemistry

ISBN:

9781305446021

Author:

Lampman

Publisher:

CENGAGE LEARNING - CONSIGNMENT

Chemistry: The Molecular Science

Chemistry

ISBN:

9781285199047

Author:

John W. Moore, Conrad L. Stanitski

Publisher:

Cengage Learning

SEE MORE TEXTBOOKS

3.2 Propose a mechanism for the polymerisation of styrene (CH2=CHPh) with nBuLi, followed by CO2 addition.