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Chapter 15: Problem 34

(Chemical Connections \(15 \mathrm{C}\) ) What structural feature is common to all benzodiazepines?

Short Answer

Expert verified
A benzene ring fused with a seven-membered diazepine ring is common to all benzodiazepines.

Step by step solution

01

Identify the Question

We are asked to find a common structural feature present in all benzodiazepine compounds.
02

Understand Benzodiazepines

Benzodiazepines are a class of drugs known for their psychoactive properties. They include medications such as diazepam, lorazepam, and alprazolam, commonly used for their sedative effects.
03

Review Benzodiazepine Structure

Upon reviewing benzodiazepine structures, it's critical to note the core structure that is shared among them. Benzodiazepines are characterized by a fusion of two rings: a benzene ring and a diazepine ring.
04

Determine the Common Feature

The common structural feature in all benzodiazepines is the presence of a benzene ring fused with a seven-membered diazepine ring. This core structure is known as the 'benzodiazepine nucleus.'

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

The Benzene Ring
The benzene ring is a highly stable and important structural component in many organic molecules, including benzodiazepines. It is an aromatic compound represented by a hexagon with a circle inside, indicating the presence of delocalized electrons. This structure allows it to undergo substitution reactions easily while maintaining its stability.
The presence of the benzene ring in benzodiazepines contributes significantly to their chemical properties and biological activity.
  • Aromaticity: The delocalized electrons provide stability and a planar structure.
  • Substitution Versatility: Allows for various functional groups to attach, lending to distinct pharmacological properties.
  • Foundation: Serves as a reliable base for the fusion of the diazepine ring.
Understanding the benzene ring is crucial as it forms the backbone of the benzodiazepine structure, actively interacting with the diazepine ring to form the characteristic core of these drugs.
The Diazepine Ring
In benzodiazepines, the diazepine ring is fused to the benzene ring, constructing the 'benzodiazepine nucleus.' This diazepine ring is distinct due to its seven-membered structure containing two nitrogen atoms, which is unusual compared to other organic compounds.
These nitrogen atoms are crucial for the pharmacological effects of benzodiazepines, affecting how the molecules bind in the brain.
  • Seven-Membered Nature: Larger than typical five or six-membered rings, influencing its flexibility and binding characteristics.
  • Nitrogen Atoms: Provide sites for chemical bonding essential for the drug's activity on brain receptors.
  • Core Structure: Fusion with the benzene ring forms the central scaffold essential for all benzodiazepines.
The diazepine ring is a key ingredient in the effectiveness of benzodiazepines as psychoactive substances. Its role in receptor interaction is pivotal for inducing therapeutic effects.
Psychoactive Drugs
Psychoactive drugs are substances that alter brain function and influence mood, perception, and behavior. Benzodiazepines fall within this category due to their profound effects on the central nervous system (CNS). They work primarily by enhancing the effect of the neurotransmitter gamma-aminobutyric acid (GABA).
This enhancement leads to calming effects, making benzodiazepines effective for anxiety, insomnia, and other conditions.
  • Mechanism of Action: Increases GABA action, reducing nervous system activity.
  • Therapeutic Uses: Widely used for anxiety, sleep disorders, and as muscle relaxants.
  • Safety and Precautions: Although effective, they can lead to dependency and tolerance over time.
Understanding how benzodiazepines function as psychoactive drugs is vital for appreciating their clinical applications and the caution required in their use.

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Most popular questions from this chapter

Account for the fact that most low-molecular-weight amines are very soluble in water, whereas lowmolecular-weight hydrocarbons are not.

If you dissolve \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{OH}\) and \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{NH}_{2}\) in the same container of water and lower the pH of the solution to 2.0 by adding HCl, would anything happen to the structures of these compounds? Write the formula of the species present in solution at pH 2.0

Procaine was one of the first local anesthetics. Its hydrochloride salt is marketed as Novocain. (a) Is procaine chiral? Does it contain a stereocenter? (b) Which nitrogen atom of procaine is the stronger base? (c) Draw a structural formula for the salt formed by treating procaine with one mole of HCl, showing which nitrogen is protonated and bears the positive charge.

Answer true or false. (a) Aqueous solutions of amines are basic. (b) Aromatic amines such as aniline in general are weaker bases than aliphatic amines such as cyclohexanamine. (c) Aliphatic amines are stronger bases than inorganic bases such as \(\mathrm{NaOH}\) and \(\mathrm{KOH}\) (d) Water-insoluble amines react with strong aqueous acids such as HCl to form water-soluble salts. (e) If the pH of an aqueous solution of a \(1^{\circ}\) aliphatic amine, \(\mathrm{RNH}_{2}\), is adjusted to pH 2.0 by the addition of concentrated \(\mathrm{HCl}\), the amine will be present in solution almost entirely as its conjugate acid, \(\mathrm{RNH}_{3}^{+}\) (f) If the pH of an aqueous solution of a \(1^{\circ}\) aliphatic amine, \(\mathrm{RNH}_{2}\), is adjusted to pH 10.0 by the addition of \(\mathrm{NaOH}\), the amine will be present in solution almost entirely as the free base, \(\mathrm{RNH}_{2}\) (g) For a \(1^{\circ}\) aliphatic amine, the concentrations of \(\mathrm{RNH}_{3}^{+}\) and \(\mathrm{RNH}_{2}\) will be equal when the \(\mathrm{pH}\) of the solution is equal to the \(\mathrm{p} K_{\mathrm{b}}\) of the amine.

(Chemical Connections \(15 \mathrm{C}\) ) Benzodiazepines affect neural pathways in the central nervous system that are mediated by GABA, whose IUPAC name is 4-aminobutanoic acid. Draw a structural formula for GABA
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