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Chapter 8: Q8-56 E (page 262)

Poly (vinyl pyrrolidone), prepared from N-vinylpyrrolidone, is used in cosmetics and as a synthetic substitute for blood. Draw a representative segment of the polymer.

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01

Polymerization

Polymerization is the formation of chain-like or network molecules, called polymers, from relatively small molecules called monomers.

02

Representative segment of Poly (vinyl pyrrolidone):

The representative segment of a polymer means a repetitive unit from which the polymer is made. Here the alkene carbons of N-vinylpyrrolidone join with other monomer units to give Poly (vinyl pyrrolidone).

Representative segment of Poly (vinyl pyrrolidone)

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Most popular questions from this chapter

Question:Predict the products of the following reactions, showing both regiochemistry and stereochemistry where appropriate:

Compound A, C10H18O, undergoes reaction with dilute H2SO4at 50 °C to yield a mixture of two alkenes, C10H16. The major alkene product, B, gives only cyclopentanone after ozone treatment followed by reduction with zinc in acetic acid. Identify A and B, and write the reactions.

Cyclopentanone

Question: In planning the synthesis of one compound from another, it’s just as important to know what not to do as to know what to do. The following reactions all have serious drawbacks to them. Explain the potential problems of each.

Iodine azide, adds to alkenes by an electrophilic mechanism similar to that of bromine. If a monosubstituted alkene such as 1-butene isused, only one product results:

a) Add lone-pair electrons to the structure shown for, and draw a

second resonance form for the molecule.

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(c) Propose a structure forα-terpinene
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