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Related Concept Videos

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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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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Inorganic Nitrogen Assimilation01:22

Inorganic Nitrogen Assimilation

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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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Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

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Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
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One of the common methods to prepare nitriles is the dehydration of amides. This method requires strong dehydrating agents like phosphorous pentoxide or boiling acetic anhydride for converting amides to nitriles. Another reagent namely, thionyl chloride also accomplishes the dehydration of amides, where amide acts as a nucleophile. The first step of the mechanism involves the nucleophilic attack by the amide on the thionyl chloride to form an intermediate. In the next step, the electron pairs...
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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
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Prospects and challenges for nitrogen-atom transfer catalysis.

Mario N Cosio1, David C Powers2

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|April 28, 2023
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Summary
This summary is machine-generated.

Nitrogen-atom transfer (NAT) chemistry, a complementary approach to nitrogen-group transfer, is emerging for C-H bond functionalization. This review explores the potential of metal nitrides in catalytic nitrogenation, highlighting challenges and opportunities.

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Area of Science:

  • Catalysis
  • Organic Synthesis
  • Inorganic Chemistry

Background:

  • C-H amination is crucial for synthesizing nitrogen-containing compounds.
  • Nitrogen-group transfer (NGT) from metal nitrenes is well-developed.
  • Nitrogen-atom transfer (NAT) from metal nitrides is an underdeveloped but promising alternative.

Purpose of the Study:

  • To summarize the current state of nitrogen-atom transfer (NAT) chemistry.
  • To discuss opportunities and challenges in developing catalytic NAT protocols.
  • To highlight the synthetic complementarity between NGT and NAT.

Main Methods:

  • Review of existing literature on stoichiometric and catalytic NAT.
  • Analysis of metal nitride electronic structure and its influence on reactivity.
  • Examination of metal nitride reactivity and emerging strategies for C-H nitrogenation.

Main Results:

  • Catalytic NAT protocols are beginning to emerge after decades of stoichiometric studies.
  • The electronic structure of metal nitrides dictates the reactivity of the nitrogen atom.
  • NAT offers synthetic complementarity to the more established NGT.

Conclusions:

  • NAT holds significant potential for the selective, catalytic nitrogenation of unfunctionalized organic molecules.
  • Further research into metal nitride reactivity and electronic properties is crucial for advancing NAT.
  • Overcoming current obstacles is key to harnessing NAT for broader synthetic applications.