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Imine formation involves the addition of carbonyl compounds to a primary amine. It begins with the generation of carbinolamine through a series of steps involving an initial nucleophilic attack and then several proton transfer reactions. The second part includes the elimination of water, as a leaving group, to give the imine.
Imines are formed under mildly acidic conditions. A pH of 4.5 is ideal for the reaction.
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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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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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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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Nitriles to Amines: LiAlH4 Reduction00:55

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Nitriles are reduced to amines in the presence of strong reducing agents like lithium aluminum hydride through a typical nucleophilic acyl substitution. The reaction requires two equivalents of the reducing agent. The reducing agent acts as a source of hydride ions.
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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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Author Spotlight: A Rapid, Microwave-Assisted Hydrothermal Synthesis Of Nickel Hydroxide Nanosheets
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Accelerating Interfacial Electron Transfer by Constructing NiMn/Ni3S2 Heterostructures for Urea Oxidation.

Guohui Li1, Shaoyang Zhang1, Guoli Liu1

  • 1College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Shanxi, P.R. China.

Chemistry, an Asian Journal
|January 14, 2026
PubMed
Summary

Highly active and cost-effective electrocatalysts for urea oxidation reaction (UOR) are crucial for sustainable hydrogen production. This study presents a novel NiMn/Ni3S2 heterostructure catalyst that demonstrates exceptional performance and durability for UOR.

Keywords:
electrocatalytic urea oxidationheterojunctionslamellar structurelayered double hydroxidesulfurization

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Electrocatalysts for urea oxidation reaction (UOR) are vital for sustainable hydrogen production.
  • Heterointerface engineering enhances UOR performance by optimizing electronic structures and charge transfer.
  • Developing cost-effective and highly active catalysts remains a key challenge.

Purpose of the Study:

  • To design and fabricate a novel 3D heterostructure electrocatalyst for efficient urea oxidation.
  • To investigate the role of heterointerface engineering in enhancing UOR activity and durability.
  • To provide a rational strategy for developing advanced electrocatalysts for energy applications.

Main Methods:

  • In situ growth of nickel-manganese layered double hydroxide (NiMn(OH)x) on a sulfurized foam nickel substrate.
  • Fabrication of a 3D NiMn/Ni3S2 heterostructure supported on foam nickel (NiMn/Ni3S2/NF).
  • Electrochemical characterization including UOR activity, Tafel slope, and long-term stability testing.

Main Results:

  • The optimized NiMn/Ni3S2/NF catalyst achieved a low potential of 1.352 V at 100 mA cm-2 and a Tafel slope of 13.34 mV dec-1.
  • The catalyst demonstrated exceptional UOR performance, surpassing most previously reported catalysts.
  • Remarkable stability was observed, with sustained high activity for over 120 hours at 10 mA cm-2.

Conclusions:

  • The designed 3D NiMn/Ni3S2/NF heterostructure exhibits superior catalytic activity and durability for UOR.
  • Heterointerface engineering effectively modulates electronic structures and enhances interfacial electron transfer.
  • This work offers a promising strategy for developing efficient and robust electrocatalysts for sustainable energy technologies.