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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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.

Answer

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Reaction of HBr with 3-methylcyclohexene yields a mixture of four products: cis- and trans-1-bromo-3-methylcyclohexane and cis- and trans-1-bromo-2-methylcyclohexane. The analogous reaction of HBr with 3-bromocyclohexene yields trans-1,2-dibromocyclohexane as the sole product. Draw structures of the possible intermediates, and then explain why only a single product is formed in this reaction.


Which of the reactions below would result in a product mixture thatwould rotate plane-polarized light?
b)

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.

Dichlorocarbene can be generated by heating sodium trichloroacetate.
Propose a mechanism for the reaction, and use curved arrows to indicate
the movement of electrons in each step. What relationship does
your mechanism bear to the base-induced elimination of HCl from
chloroform?

Which of the reactions below would result in a product mixture thatwould rotate plane-polarized light?
c)

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