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Electrophilic Aromatic Substitution: Nitration of Benzene01:20

Electrophilic Aromatic Substitution: Nitration of Benzene

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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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All meta-directing substituents are deactivating groups. These substituents withdraw electrons from the aromatic ring, making the ring less reactive toward electrophilic substitution. For example, the nitration of nitrobenzene is 100,000 times slower than that of benzene because of the deactivating effect of the nitro group. The first step in an electrophilic aromatic substitution is the addition of an electrophile to form a resonance-stabilized carbocation. The energy diagrams for...
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Enamine formation involves the addition of carbonyl compounds to a secondary amine through a series of reactions. The mechanism begins with the generation of carbinolamine, a nucleophilic attack followed by several proton transfer reactions. The hydroxyl group of the carbinolamine is converted into water to make a better leaving group that can push the reaction forward by eliminating a water molecule. In enamine formation, the last step involves the abstraction of a proton from the α carbon to...
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Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme...
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Overview of Nitrogen Metabolism01:20

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Nitrogen is a very important element for life because it is a major constituent of proteins and nucleic acids. It is a macronutrient, and in nature, it is recycled from organic compounds and stored in the form of  ammonia, ammonium ions, nitrate, nitrite, or  nitrogen gas by many metabolic processes. Many of these metabolic processes are carried out only by prokaryotes.
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Enzymatic Nitrogen Insertion into Unactivated C-H Bonds.

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Summary
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Researchers evolved new enzymes for selective C-H bond amination and amidation, a novel biochemical approach for nitrogen incorporation from saturated precursors.

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Area of Science:

  • Biocatalysis
  • Enzyme Engineering
  • Organic Chemistry

Background:

  • Selective functionalization of aliphatic C-H bonds is crucial for chemical synthesis but challenging.
  • Enzymatic nitrogen functionalization of C-H bonds is currently unknown in nature.
  • Synthetic methods for selective C-H amination/amidation are limited.

Purpose of the Study:

  • To develop novel enzymes for selective amination and amidation of unactivated C(sp3)-H bonds.
  • To explore directed evolution for creating new-to-nature nitrene transferases.
  • To establish a new biochemical pathway for nitrogen incorporation.

Main Methods:

  • Directed evolution of heme-containing nitrene transferases.
  • Enzyme assays with various substrates, including methyl- and ethylcyclohexane.
  • Kinetic isotope effects (KIEs) and computational studies (MD simulations).

Main Results:

  • Evolved enzymes demonstrate selective amination and amidation of unactivated C(sp3)-H sites.
  • Demonstrated desymmetrization of methyl- and ethylcyclohexane with divergent selectivity.
  • Evolved enzymes exhibit broad substrate promiscuity.

Conclusions:

  • Developed novel nitrene transferases capable of selective C-H amination/amidation.
  • The mechanism involves a stepwise radical pathway with HAT and radical rebound.
  • These enzymes offer a new biochemical strategy for synthesizing nitrogen-containing compounds.