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Catalysis02:50

Catalysis

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The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
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Carboxylic acids react with diazomethane in an ether solvent via alkylation at the carboxylate oxygen atom to give methyl esters of the corresponding acid with excellent yields.
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Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.
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Electrophilic Aromatic Substitution: Nitration of Benzene01:20

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The nitration of benzene is an example of an electrophilic aromatic substitution reaction. It involves the formation of a very powerful electrophile, the nitronium ion, which is linear in shape. The reaction occurs through the interaction of two strong acids, sulfuric and nitric acid.
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2° Amines to N-Nitrosamines: Reaction with NaNO2

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Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
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ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH301:11

ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH3

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All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...
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Nitrite-driven anaerobic ethane oxidation.

Cheng-Cheng Dang1, Yin-Zhu Jin1, Xin Tan1

  • 1State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, China.

Environmental Science and Ecotechnology
|July 22, 2024
PubMed
Summary

Microbes can now be shown to oxidize ethane using nitrite, a previously unknown process. This discovery sheds light on the environmental impact of anaerobic ethane oxidation in natural settings.

Keywords:
Anaerobic ethane oxidationDenitrificationFumarate addition pathwayGreenhouse gasMicrobial culture

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Area of Science:

  • Environmental microbiology
  • Biogeochemistry
  • Greenhouse gas mitigation

Background:

  • Ethane is a significant greenhouse gas in anoxic environments.
  • Microbial oxidation of ethane typically uses sulfate or nitrate as electron acceptors.
  • Nitrite is a more thermodynamically favorable electron acceptor, yet its role in ethane oxidation is poorly understood.

Purpose of the Study:

  • To investigate nitrite-driven anaerobic oxidation of ethane.
  • To enrich and characterize a microbial culture capable of this process.
  • To elucidate the metabolic pathways involved in nitrite-driven ethane oxidation.

Main Methods:

  • Enrichment of a microbial culture in a specialized bioreactor.
  • Long-term continuous operation to assess stability of ethane oxidation and nitrite removal.
  • Metabolic function analysis and genomic investigation of the microbial community.
  • Development of a metabolic model for the identified microbial species.

Main Results:

  • A stable microbial culture capable of nitrite-driven anaerobic ethane oxidation was successfully enriched.
  • Consistent rates of nitrite removal (25.0 mg NO2--N L-1 d-1) and ethane oxidation (11.48 mg C2H6 L-1 d-1) were maintained.
  • Ethane was confirmed as essential for nitrite removal by the microbial culture.
  • A novel bacterial species, 'Candidatus Alkanivoras nitrosoreducens', was identified as the likely organism responsible for the process.
  • A proposed metabolic pathway involving fumarate addition and complete denitrification was identified.

Conclusions:

  • Nitrite-driven anaerobic ethane oxidation is a viable microbial process.
  • The novel bacterium 'Ca. A. nitrosoreducens' plays a key role in this pathway.
  • This process has significant implications for understanding greenhouse gas dynamics in anoxic environments.
  • Further research into anaerobic ethane oxidation is warranted to assess its full environmental impact.