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Chapter 21: Q27E (page 726)
Name the following compounds:
a.
b.
Name of the following two compounds can be given as:
The name is given as
The name is given as
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21-68 When a carboxylic acid is dissolved in isotopically labeled water, thelabel rapidly becomes incorporated into both oxygen atoms of the carboxylic acid. Explain.
The step-growth polymer nylon 6 is prepared from caprolactam. The reaction involves the initial reaction of caprolactam with water to give an intermediate open-chain amino acid, followed by heating to form the polymer. Propose a mechanism for both steps, and show the structures of nylon 6.
When an amide is formed from an acid chloride or an anhydride, two moles of base are required. However, when an ester is used as the starting material, only one equivalent of base is needed. Explain the reactivity in terms of basicity of the leaving groups.
What kinds of functional groups might compounds have if they show the following IR absorptions?
(a) Absorption at 1735 cm-1
(b) Absorption at 1810 cm-1
(c) Absorptions at 2500 to 3300 cm-1 and 1710 cm-1
(d) Absorption at 1715 cm-1
Question: 21-63 Polyimides with the structure shown are used as coatings on glass and plastics to improve scratch resistance. How would you synthesize a polyimide? (See Problem 21-39.)
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