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Nucleophilic Aromatic Substitution: Elimination–Addition01:11

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Simple aryl halides do not react with nucleophiles. However, nucleophilic aromatic substitutions can be forced under certain conditions, such as high temperatures or strong bases. The mechanism of substitution under such conditions involves the highly unstable and reactive benzyne intermediate. Benzyne contains equivalent carbon centers at both ends of the triple bond, each of which is equally susceptible to nucleophilic attack. This 50–50 distribution of products is...
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Simple aryl halides do not react with nucleophiles under normal conditions. However, the reaction can proceed under drastic conditions involving high temperatures and high pressure to give the substituted products. For example, chlorobenzene is converted to phenol using aqueous sodium hydroxide at 350 °C under high pressure by the Dow process. The reaction follows an elimination-addition mechanism involving a benzyne intermediate. Here, the chloride ion is...
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Chlorination and bromination are important classes of electrophilic aromatic substitutions, where benzene reacts with chlorine or bromine in the presence of a Lewis acid catalyst to give halogenated substitution products. A Lewis acid such as aluminium chloride or ferric chloride catalyzes the chlorination, and ferric bromide catalyzes the bromination reactions. During the bromination of alkenes, bromine polarizes and becomes electrophilic. However, in the bromination of benzene, the bromine...
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Bacterial dehalorespiration with chlorinated benzenes.

L Adrian1, U Szewzyk, J Wecke

  • 1Fachgebiet Technische Biochemie, Technische Universität, Berlin, Germany. lorenz.adrian@tu-berlin.de

Nature
|December 16, 2000
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Summary

A novel anaerobic bacterium, strain CBDB1, dechlorinates toxic chlorobenzenes. This specialized microbe offers a new pathway for bioremediation of persistent environmental pollutants.

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Area of Science:

  • Environmental Microbiology
  • Bioremediation
  • Anaerobic Respiration

Background:

  • Chlorobenzenes are persistent environmental contaminants that bioaccumulate.
  • Microbial transformation of highly chlorinated benzenes is limited to reductive dechlorination under anaerobic conditions.
  • Previous studies relied on mixed bacterial cultures for chlorobenzene dechlorination.

Purpose of the Study:

  • To isolate and characterize a pure bacterial culture capable of reductive dechlorination of chlorobenzenes.
  • To investigate the metabolic capabilities and growth requirements of the isolated strain.
  • To determine the phylogenetic placement of the novel bacterium.

Main Methods:

  • Isolation of an oxygen-sensitive bacterial strain (CBDB1) from environmental samples.
  • Cultivation and characterization of the pure culture under anaerobic conditions.
  • 16S rRNA gene sequencing for phylogenetic analysis.

Main Results:

  • Strain CBDB1 was isolated and identified as a pure culture capable of reductive dechlorination.
  • The bacterium stoichiometrically dechlorinates various trichlorobenzenes (TCBs) and tetrachlorobenzenes (TeCBs) to dichlorobenzenes or 1,3,5-TCB.
  • Growth of strain CBDB1 is dependent on chlorobenzene as an electron acceptor and hydrogen as an electron donor, indicating a dehalorespiratory process.
  • Phylogenetic analysis places strain CBDB1 within a new bacterial cluster, distinct from previously identified dehalogenating bacteria.

Conclusions:

  • Strain CBDB1 represents a unique, oxygen-sensitive bacterium with specialized dehalorespiratory capabilities.
  • This discovery provides a new tool for the bioremediation of chlorobenzene-contaminated environments.
  • The isolation of a chlorobenzene-dechlorinating bacterium that thrives on a synthetic medium advances the understanding of microbial metabolism and evolution.