Lec 2 | Six-membered ring system
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Questions and Answers

What are some examples of three-membered heterocyclic rings mentioned in the text?

  • Epoxides and carbonyl groups
  • Aziridines and alkenes
  • Carboxylic acids and alcohols
  • Epoxides and aziridines (correct)

Which type of compounds are resistant toward alkali but easily cleaved by acid according to the text?

  • Esters formed with dihydropyran (correct)
  • Amines formed with sulfonium ions
  • Alkenes formed with halonium ions
  • Alcohols formed with epoxides

What is a common method mentioned in the text to mask carboxyl groups?

  • Reaction with dihydropyran (correct)
  • Reaction with chlorophyll
  • Reaction with THP esters
  • Reaction with halonium ions

What biological compounds are highlighted as being heterocyclic in the text?

<p>Carbohydrates and chlorophyll (A)</p> Signup and view all the answers

In biological systems, which compounds are described as making leaves green and blood red?

<p>Chlorophyll and hemin (A)</p> Signup and view all the answers

What is emphasized as the ultimate determinant of heredity according to the text?

<p>The sequence of attachment of heterocyclic rings to nucleic acids (B)</p> Signup and view all the answers

Which kind of compounds contain rings made up of more than one kind of atom?

<p>Heterocyclic compounds (D)</p> Signup and view all the answers

In heterocyclic compounds, what are the most commonly found atoms in addition to carbon?

<p>Nitrogen, Oxygen, or Sulfur (D)</p> Signup and view all the answers

What do heteroatoms in a heterocyclic compound generally receive in terms of numbering the ring positions?

<p>The lowest possible numbers (B)</p> Signup and view all the answers

Which of the following is an example of a cyclic anhydride encountered in heterocyclic compounds?

<p>Succinic anhydride (D)</p> Signup and view all the answers

What type of compounds are lactones and lactams classified as in heterocyclic chemistry?

<p>Cyclic esters and cyclic amides (D)</p> Signup and view all the answers

Which solvent is mentioned as an example of a cyclic acetal of dihydroxy alcohols?

<p>$ ext{C}<em>4 ext{H}</em>{10} ext{O}_2$ (D)</p> Signup and view all the answers

Which term describes rings made up only of carbon atoms in cyclic compounds?

<p>Homocyclic (A)</p> Signup and view all the answers

Which heteroatoms are commonly found in rings of heterocyclic compounds?

<p>Oxygen and Sulfur (D)</p> Signup and view all the answers

What do heteroatoms typically receive in the numbering of ring positions in heterocyclic compounds?

<p>Lowest possible numbers (A)</p> Signup and view all the answers

Which type of compounds are succinic anhydride and phthalimide examples of?

<p>Cyclic Anhydrides (A)</p> Signup and view all the answers

What is the chemistry of cyclic esters and cyclic amides essentially similar to?

<p>Open chain analogs (D)</p> Signup and view all the answers

Which compound is emphasized in the text as being a cyclic acetal of dihydroxy alcohols?

<p>Dioxane (B)</p> Signup and view all the answers

Which statement about heterocyclic intermediates is true according to the text?

<p>They are being increasingly utilized as temporary protecting groups in organic synthesis. (C)</p> Signup and view all the answers

What is the significance of heterocyclic compounds in biological systems as highlighted in the text?

<p>All of the above. (D)</p> Signup and view all the answers

Which statement about the reactivity of three-membered heterocyclic rings is correct according to the text?

<p>They are highly reactive due to the presence of ring strain. (D)</p> Signup and view all the answers

Which type of heterocyclic compound is mentioned as being resistant to base but easily cleaved by acid?

<p>Tetrahydropyranyl (THP) esters (D)</p> Signup and view all the answers

Which of the following heterocyclic compounds is NOT mentioned in the text as an example?

<p>$\beta$-Lactams (D)</p> Signup and view all the answers

What is the purpose of masking carboxyl groups with dihydropyran as mentioned in the text?

<p>To protect the carboxyl group during synthetic transformations. (B)</p> Signup and view all the answers

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