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Amides to Amines: LiAlH4 Reduction01:20

Amides to Amines: LiAlH4 Reduction

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Amide reduction with strong reducing agents like lithium aluminum hydride proceeds through a nucleophilic acyl substitution to form amines. Primary, secondary, and tertiary amides yield primary, secondary, and tertiary amines, respectively.
Amide reduction requires two equivalents of the reducing agent, acting as a source of hydride ions. As shown in the figure, the reaction is initiated with a nucleophilic attack by the hydride ion at the carbonyl carbon to form a tetrahedral intermediate.
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Inorganic Nitrogen Assimilation01:22

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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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Preparation of Amines: Reduction of Oximes and Nitro Compounds01:29

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Oximes can be reduced to primary amines using catalytic hydrogenation, hydride reduction, or sodium metal reduction. The reduction of aliphatic and aromatic nitro compounds to primary amines takes place by either catalytic hydrogenation or by using active metals like Fe, Zn, and Sn in the presence of an acid.
Though catalytic hydrogenation can reduce nitrobenzenes, the reduction is nonselective in the presence of other functional groups. For instance, if nitrobenzene contains an aldehyde group,...
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Preparation of Amines: Reductive Amination of Aldehydes and Ketones01:38

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Carbonyl compounds and primary amines undergo reductive amination first to produce imines, followed by secondary amines in the same reaction mixture, using selective reducing agents like sodium cyanoborohydride or sodium triacetoxyborohydride. Reductive amination produces different degrees of substitution of amines depending on the starting amine substrate.
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Preparation of Amines: Reduction of Amides and Nitriles01:13

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Nitriles can be reduced to primary amines using reducing agents like lithium aluminum hydride or catalytic hydrogenation. The reduction introduces an amino group with an extra carbon in the skeleton. Nitriles are formed from the reaction between alkyl halides and sodium cyanide through the SN2 mechanism. Primary alkyl halides are the preferred substrates to prepare nitriles.
Amides can be reduced to primary, secondary, and tertiary amines using catalytic hydrogenation, active metals like Fe,...
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Reduction of Alkynes to trans-Alkenes: Sodium in Liquid Ammonia02:10

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Alkynes can be reduced to trans-alkenes using sodium or lithium in liquid ammonia. The reaction, known as dissolving metal reduction, proceeds with an anti addition of hydrogen across the carbon–carbon triple bond to form the trans product. Since ammonia exists as a gas (bp = −33°C) at room temperature, the reaction is carried out at low temperatures using a mixture of dry ice (sublimes at −78°C) and acetone. 
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Synthesis and Characterization of Fe-doped Aluminosilicate Nanotubes with Enhanced Electron Conductive Properties
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Atomic Pathways of Ammonia-Driven Fe3O4 Reduction Revealed by First-Principles Calculations.

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Ammonia (NH3) offers a viable alternative to hydrogen for iron ore reduction. This study reveals NH3

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Area of Science:

  • Materials Science
  • Catalysis
  • Computational Chemistry

Background:

  • Direct iron ore reduction using hydrogen faces logistical challenges.
  • Ammonia (NH3) presents a promising, economically viable alternative reductant due to its high hydrogen content and established infrastructure.

Purpose of the Study:

  • To elucidate the atomic-scale mechanisms of ammonia adsorption, dehydrogenation, and nitrogen incorporation on the Fe3O4(001) surface using density functional theory.
  • To understand the role of surface oxygen vacancies and hydrogen mobility in NH3-driven iron ore reduction.

Main Methods:

  • Density Functional Theory (DFT) calculations were employed to simulate NH3 interactions with the Fe3O4(001) surface.
  • Analysis of adsorption configurations, dehydrogenation pathways, and nitrogen incorporation mechanisms.

Main Results:

  • NH3 adsorbs upright on surface Fe sites, undergoing sequential dehydrogenation.
  • Hydrogen migration is the rate-determining step for H2O formation, generating crucial oxygen vacancies.
  • Nitrogen species (NH, N) strongly bind to the surface, facilitating N incorporation into the Fe lattice to form iron nitride.
  • Surface vacancies migrate, and N2 formation prevents excessive nitrogen accumulation.

Conclusions:

  • NH3 effectively reduces Fe3O4 by creating and utilizing surface oxygen vacancies.
  • The study provides atomistic insights into NH3-based ironmaking, highlighting coupled vacancy dynamics, H mobility, and N incorporation.
  • Findings offer mechanistic understanding for optimizing sustainable iron ore reduction and NH3-enabled catalytic processes.