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Questions and Answers
What is the correct rule for numbering a ring with multiple heteroatoms?
What is the correct rule for numbering a ring with multiple heteroatoms?
- Always begin with the heteroatom with the lowest atomic number.
- Start with the heteroatom that gives the lowest number to the next priority atom. (correct)
- Begin with the heteroatom that has the highest priority.
- Start with the heteroatom closest to the fused bond.
What is the reason for pyrrole having a high boiling point compared to furan and thiophene?
What is the reason for pyrrole having a high boiling point compared to furan and thiophene?
- Higher electronegativity of nitrogen.
- Higher molecular weight.
- Stronger covalent bonds.
- Presence of intermolecular hydrogen bonding. (correct)
Why is pyrrole considered an important heterocyclic compound?
Why is pyrrole considered an important heterocyclic compound?
- Presence in naturally occurring substances like alkaloids and haemoglobin. (correct)
- Due to its bright red color.
- Because it contains a sulfur atom.
- Its derivation from a Greek word.
What does pyrrole's name 'pyrros' in Greek signify?
What does pyrrole's name 'pyrros' in Greek signify?
What determines the numbering of a ring with one heteroatom?
What determines the numbering of a ring with one heteroatom?
Where does pyrrole naturally occur?
Where does pyrrole naturally occur?
What is the color produced when pyrrole reacts with p-dimethylaminobenzaldehyde?
What is the color produced when pyrrole reacts with p-dimethylaminobenzaldehyde?
How is pyrrole removed during the isolation process?
How is pyrrole removed during the isolation process?
Which synthesis method involves the reaction of a-haloketones with β-ketoester in the presence of ammonia?
Which synthesis method involves the reaction of a-haloketones with β-ketoester in the presence of ammonia?
What is the primary source of pyrrole in the text?
What is the primary source of pyrrole in the text?
What is used to wash the isolated bone oil to remove acidic substances?
What is used to wash the isolated bone oil to remove acidic substances?
How are saturated atoms in a partially saturated ring typically designated?
How are saturated atoms in a partially saturated ring typically designated?
What is the rule followed for designating the position of fusion in benzofused compounds?
What is the rule followed for designating the position of fusion in benzofused compounds?
In the nomenclature of fused systems, what do the words 'dihydro', 'trihydro', 'tetrahydro' indicate?
In the nomenclature of fused systems, what do the words 'dihydro', 'trihydro', 'tetrahydro' indicate?
How should substituents in a heterocyclic compound be listed?
How should substituents in a heterocyclic compound be listed?
What is a nonsystematic name given to an organic compound?
What is a nonsystematic name given to an organic compound?
How is the highest priority atom indicated in naming heterocyclic compounds?
How is the highest priority atom indicated in naming heterocyclic compounds?
What is the primary importance of heterocyclic compounds?
What is the primary importance of heterocyclic compounds?
Which of the following is an example of a heterocyclic compound used as a drug?
Which of the following is an example of a heterocyclic compound used as a drug?
Which of the following is NOT a common heterocyclic ring system?
Which of the following is NOT a common heterocyclic ring system?
What type of heterocyclic rings contain oxygen as the heteroatom?
What type of heterocyclic rings contain oxygen as the heteroatom?
In the nomenclature of heterocyclic compounds, what is considered when naming monoheterocyclic compounds with more than one heteroatom?
In the nomenclature of heterocyclic compounds, what is considered when naming monoheterocyclic compounds with more than one heteroatom?
Which of the following heterocyclic ring systems is NOT mentioned in the text?
Which of the following heterocyclic ring systems is NOT mentioned in the text?
What is the primary source of pyrrole in the text?
What is the primary source of pyrrole in the text?
In the Ehrlich Test, what color is produced when pyrrole reacts with p-dimethylaminobenzaldehyde?
In the Ehrlich Test, what color is produced when pyrrole reacts with p-dimethylaminobenzaldehyde?
How is pyrrole removed during the isolation process?
How is pyrrole removed during the isolation process?
Which synthesis method involves the reaction of a-haloketones with β-ketoester in the presence of ammonia?
Which synthesis method involves the reaction of a-haloketones with β-ketoester in the presence of ammonia?
What is used to wash the isolated bone oil to remove basic substances?
What is used to wash the isolated bone oil to remove basic substances?
Which of the following is NOT mentioned as an importance of heterocyclic compounds in the text?
Which of the following is NOT mentioned as an importance of heterocyclic compounds in the text?
Which of the following classes of heterocyclic rings is NOT mentioned in the text?
Which of the following classes of heterocyclic rings is NOT mentioned in the text?
What is the primary consideration when naming monoheterocyclic compounds with more than one heteroatom?
What is the primary consideration when naming monoheterocyclic compounds with more than one heteroatom?
Which of the following heterocyclic compounds is mentioned as being used as a drug?
Which of the following heterocyclic compounds is mentioned as being used as a drug?
Based on the information provided, which of the following statements about the nomenclature of heterocyclic compounds is correct?
Based on the information provided, which of the following statements about the nomenclature of heterocyclic compounds is correct?
Which of the following heterocyclic ring systems is considered a fused ring?
Which of the following heterocyclic ring systems is considered a fused ring?
Which statement correctly describes the rule for indicating the position of hetero atoms in heterocyclic compounds?
Which statement correctly describes the rule for indicating the position of hetero atoms in heterocyclic compounds?
How are saturated atoms in a partially saturated heterocyclic ring designated?
How are saturated atoms in a partially saturated heterocyclic ring designated?
What is the correct order for listing substituents on a heterocyclic compound?
What is the correct order for listing substituents on a heterocyclic compound?
What does the prefix 'benzo' indicate in the nomenclature of benzofused heterocyclic compounds?
What does the prefix 'benzo' indicate in the nomenclature of benzofused heterocyclic compounds?
What rule is followed for designating the position of fusion in benzofused heterocyclic compounds?
What rule is followed for designating the position of fusion in benzofused heterocyclic compounds?
What is a 'trivial name' in the context of heterocyclic compounds?
What is a 'trivial name' in the context of heterocyclic compounds?
What is the molecular formula of pyrrole?
What is the molecular formula of pyrrole?
Why does pyrrole have a relatively high boiling point compared to furan and thiophene?
Why does pyrrole have a relatively high boiling point compared to furan and thiophene?
Which of the following is the correct rule for numbering a ring with one heteroatom?
Which of the following is the correct rule for numbering a ring with one heteroatom?
What is the rule for numbering a ring with more than one heteroatom?
What is the rule for numbering a ring with more than one heteroatom?
How are the bonds of the heterocyclic ring assigned?
How are the bonds of the heterocyclic ring assigned?
What does the name 'pyrrole' originate from?
What does the name 'pyrrole' originate from?
Study Notes
Heterocyclic Compounds
- Primary importance of heterocyclic compounds: they are widely used in pharmaceuticals and biotechnology.
- Example of a heterocyclic compound used as a drug: pyrrole.
Pyrrole
- Name 'pyrros' in Greek signifies fire, due to its formation during the destructive distillation of bones.
- Naturally occurs in: bone oil.
- Removed during the isolation process: by distillation with zinc dust or by treatment with hydrogen in the presence of a catalyst.
- Reacts with p-dimethylaminobenzaldehyde to produce: a pink to red color.
Nomenclature
- Highest priority atom indicated by: a number.
- Substituents listed: alphabetically.
- Nonsystematic name: trivial name.
- Primary consideration when naming monoheterocyclic compounds with more than one heteroatom: the heteroatom of highest priority.
Ring Numbering
- Rule for numbering a ring with one heteroatom: the heteroatom is assigned the number 1.
- Rule for numbering a ring with more than one heteroatom: the heteroatom of highest priority is assigned the number 1.
- Bonds of the heterocyclic ring assigned: in a clockwise direction.
Fused Ring Systems
- Prefix 'benzo' indicates: fusion with a benzene ring.
- Rule for designating the position of fusion: the benzene ring is assigned the prefix 'benzo' and is numbered from the point of attachment.
Heteroatoms
- O-containing heterocyclic rings: oxygen as the heteroatom.
- Dihydro, trihydro, tetrahydro indicate: the number of hydrogen atoms added to the parent compound.
Synthesis
- Synthesis method involving the reaction of α-haloketones with β-ketoester in the presence of ammonia: Paal-Knorr synthesis.
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Description
Explore the fundamentals of organic chemistry focusing on heterocyclic compounds, including an introduction, importance, common rings, and nomenclature. Dive into the study of Pyrrole and its significance in the field of chemistry.
