Lec 2 | Six-membered ring system

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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?

Carbohydrates and chlorophyll Signup and view all the answers

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

Chlorophyll and hemin Signup and view all the answers

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

The sequence of attachment of heterocyclic rings to nucleic acids Signup and view all the answers

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

Heterocyclic compounds Signup and view all the answers

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

Nitrogen, Oxygen, or Sulfur Signup and view all the answers

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

The lowest possible numbers Signup and view all the answers

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

Succinic anhydride Signup and view all the answers

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

Cyclic esters and cyclic amides Signup and view all the answers

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

$ ext{C}4 ext{H}{10} ext{O}_2$ Signup and view all the answers

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

Homocyclic Signup and view all the answers

Which heteroatoms are commonly found in rings of heterocyclic compounds?

Oxygen and Sulfur Signup and view all the answers

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

Lowest possible numbers Signup and view all the answers

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

Cyclic Anhydrides Signup and view all the answers

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

Open chain analogs Signup and view all the answers

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

Dioxane Signup and view all the answers

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

They are being increasingly utilized as temporary protecting groups in organic synthesis. Signup and view all the answers

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

All of the above. Signup and view all the answers

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

They are highly reactive due to the presence of ring strain. Signup and view all the answers

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

Tetrahydropyranyl (THP) esters Signup and view all the answers

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

$\beta$-Lactams Signup and view all the answers

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

To protect the carboxyl group during synthetic transformations. Signup and view all the answers