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Related Concept Videos

Five-Membered Heterocyclic Aromatic Compounds: Overview01:13

Five-Membered Heterocyclic Aromatic Compounds: Overview

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Heterocyclic aromatic compounds are cyclic compounds that are aromatic and have one or more heteroatoms—atoms other than carbon, in the ring. Depending upon the number of atoms present in the ring, they can be either five or six-membered. Examples of five-membered heterocyclic aromatic compounds include pyrrole, furan, thiophene, and imidazole. Pyrrole consists of one nitrogen atom having one lone pair of electrons. Furan and thiophene have one oxygen and one sulfur heteroatom,...
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Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
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Types of Toxins01:36

Types of Toxins

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Humans continually engage with an environment rich in potentially harmful chemicals. These are introduced to our bodies through inhalation, ingestion, or skin contact. These chemicals exist in various forms, such as air and environmental pollutants, agricultural chemicals, organic solvents, and heavy metals.
Air pollutants, primarily gases, pose significant threats to respiratory health, leading to conditions like hypoxia, lung cancer, and in extreme cases, death.
Environmental pollutants like...
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Aromatic Compounds: Overview01:25

Aromatic Compounds: Overview

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In general, the term ‘aromatic’ indicates a pleasant smell or fragrance from fresh flowers, freshly prepared coffee, etc. In the early history of organic chemistry, many benzene derivatives were isolated from the pleasant odor oils of the plants. For example, vanillin was isolated from the oil of vanilla, methyl salicylate from the oil of wintergreen, and cinnamaldehyde from the oil of cinnamon. They all had a pleasant odor; hence the name aromatic was given.
In 1825, Faraday isolated...
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Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
Due to the absence of continuous...
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Phase I Reactions: Oxidation of Aliphatic and Aromatic Carbon-Containing Systems01:19

Phase I Reactions: Oxidation of Aliphatic and Aromatic Carbon-Containing Systems

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Phase I biotransformation reactions are integral to drug metabolism, predominantly involving oxidative, reductive, and hydrolytic transformations. Chief among these are oxidative reactions, which enhance the hydrophilicity of xenobiotics and introduce polar functional groups to facilitate their elimination from the body.
Oxidation reactions are fundamental in aromatic carbon-containing systems. An example is the hydroxylation of phenobarbital, a process that transforms it into...
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Polycyclic Aromatic Hydrocarbons: Part I. Exposure.

Okechukwu Clinton Ifegwu1, Chimezie Anyakora2

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Polycyclic aromatic hydrocarbons (PAH) are major carcinogens that threaten human health. These compounds can bind to DNA, causing disruptive effects that lead to tumor initiation and bioaccumulation in tissues.

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Area of Science:

  • Environmental Chemistry
  • Toxicology
  • Public Health

Background:

  • Polycyclic aromatic hydrocarbons (PAH) represent the largest class of chemical carcinogens.
  • PAH are ranked ninth among chemical compounds posing a threat to human health.
  • These compounds exhibit genotoxic, mutagenic, teratogenic, and carcinogenic properties.

Purpose of the Study:

  • To review the exposure to polycyclic aromatic hydrocarbons (PAH).
  • To discuss the carcinogenic properties and mechanisms of PAH.
  • To explore the bioaccumulative nature of these compounds.

Main Methods:

  • Literature review of PAH exposure.
  • Analysis of PAH carcinogenicity mechanisms.
  • Examination of PAH bioaccumulation in organisms.

Main Results:

  • PAH are significant environmental pollutants with diverse toxicological effects.
  • Carcinogenicity of PAH is linked to their DNA-binding ability, inducing disruptive cellular effects.
  • Many PAH act as synergists, enhancing the carcinogenic potential of other compounds.

Conclusions:

  • Understanding PAH exposure is crucial for public health and risk assessment.
  • Structural modifications of PAH can influence their DNA cross-linking capability and carcinogenicity.
  • Further research is needed to fully elucidate the synergistic effects and long-term health impacts of PAH.