Organic chemistryLesson 2 of 2 in the course Organic Chemistry

Amines and Amides in Alkaloids, Proteins, Enzymes, and Kevlar

5 flashcards · 5 quiz questions · 5 match pairs · 4 fill-in sentences · English

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Summary

Amines are nitrogen-containing organic compounds found in medicines, natural products, and molecules essential to life. This lesson introduces their structure and naming, explains why they behave as weak bases, and connects nitrogen-containing compounds to DNA and alkaloids.

An amine contains a nitrogen atom bonded to carbon and/or hydrogen atoms. In a typical neutral amine, nitrogen has three bonds and one lone pair of electrons. That lone pair is important because it can accept a proton, making amines weak bases, much like ammonia.

All flashcards

Why can a neutral amine accept a proton?
Its nitrogen lone pair can form a bond to the proton.
What is amidation?
Formation of an amide from a carboxylic acid and an amine or ammonia, with water released.
What determines a protein's folded shape?
Interactions among parts of its polypeptide chain, influenced by its amino-acid sequence.
What is an enzyme substrate?
A molecule that an enzyme binds and converts into product or products.
What is aromatic stacking in Kevlar?
Interactions between unhybridized p orbitals of neighboring aromatic rings.

Quiz questions

  1. Which structural feature defines an amide?Answer: Nitrogen bonded to a carbonyl carbon.
  2. Why is amidation classified as a condensation reaction?Answer: The reactants join as water is eliminated.
  3. What links two amino acids when a peptide bond forms?Answer: The carbonyl carbon of one links to the nitrogen of the other.
  4. How does an enzyme affect the reaction it catalyzes?Answer: It lowers the activation energy without being consumed.
  5. Which features contribute to Kevlar's strength?Answer: Hydrogen bonds between chains and aromatic stacking.

Based on Chemistry 2e by Paul Flowers, Klaus Theopold, Richard Langley, William R. Robinson, PhD (OpenStax), licensed CC BY 4.0. Adapted into a summary, flashcards and quizzes.

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