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Chapter 30: Question 30.18 (page 1214)

Lexan can also be prepared by the acid-catalyzed reaction of diphenyl carbonate with bisphenol A. Draw a stepwise mechanism for this process.

Short Answer

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Answer

Mechanism of the reaction

Step by step solution

01

Lexan

Lexan is a polymer that consists of polycarbonates in its structure. This polymer can be prepared using the method of acid-catalyzed reaction between bisphenol A and diphenyl carbonate.

02

Meaning of acid catalysis

Acid catalysis is a chemical reaction that takes place in the presence of an acid which acts as a catalyst for the reaction. This type of chemical reaction is widely used in organic reactions.

03

Stepwise mechanism for the given reaction

The lone pair of electrons on the oxygen atom of diphenyl carbonate react with proton leading to the formation of a cation. Bisphenol A is added to this species. After rearrangements, the Lexan will be formed.

The stepwise mechanism is shown below.

Mechanism of the reaction

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Most popular questions from this chapter

Compound A is a novel poly(ester amide) copolymer that can be used as a bioabsorbable coating for the controlled release of drugs. A is a copolymer of four monomers, two of which are amino acids or amino acid derivatives. The body’s enzymes recognize the naturally occurring amino acids in the polymer backbone, allowing for the controlled enzymatic breakdown of the polymer and steady release of an encapsulated drug. Identify the four monomers used to synthesize A; then use Figure 29.2 to name the two amino acids.

Poly(ester amide) A

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