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Related Concept Videos

Preparation of Amines: Reductive Amination of Aldehydes and Ketones01:38

Preparation of Amines: Reductive Amination of Aldehydes and Ketones

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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.
2.6K
Amines to Amides: Acylation of Amines01:19

Amines to Amides: Acylation of Amines

2.3K
Various carboxylic acid derivatives (such as acid chlorides, esters, and anhydrides) can be used for the acylation of amines to yield amides. The reaction requires two equivalents of amines. The first amine molecule functions as a nucleophile and attacks the carbonyl carbon to produce a tetrahedral intermediate. This is followed by the loss of the leaving group and restoration of the C=O bond.
Next, the second equivalent of amine serves as a Brønsted base and deprotonates the quaternary...
2.3K
Preparation of Amines: Reduction of Oximes and Nitro Compounds01:29

Preparation of Amines: Reduction of Oximes and Nitro Compounds

3.3K
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,...
3.3K
Amides to Amines: LiAlH4 Reduction01:20

Amides to Amines: LiAlH4 Reduction

4.4K
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.
4.4K
Nitriles to Amines: LiAlH4 Reduction00:55

Nitriles to Amines: LiAlH4 Reduction

3.2K
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.
As shown below, the mechanism involves three steps. Firstly, the hydride ion acting as a nucleophile attacks the nitrile carbon to form an anion. In the second step, a second equivalent of the hydride ion attacks the anion to...
3.2K
Reduction of Alkynes to trans-Alkenes: Sodium in Liquid Ammonia02:10

Reduction of Alkynes to trans-Alkenes: Sodium in Liquid Ammonia

9.0K
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. 
When dissolved in liquid ammonia, an alkali metal,...
9.0K

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Author Spotlight: Standardizing the Development of Amine-Based Silica Composites as CO2 Adsorbents for Direct Air Capture
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Electrifying amine carbon capture with robust redox-tunable acids.

Xing Li1,2, Charles B Musgrave3, Andong Liu4

  • 1Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, MD, USA. xing.li@cityu.edu.hk.

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|May 9, 2025
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Summary

Chemically robust, redox-tunable Brønsted acids enable electrochemical carbon capture using renewable energy. This approach enhances amine regeneration for CO2 separation, offering a stable and scalable alternative to traditional methods.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Environmental Science

Background:

  • Current electrochemical carbon capture methods face challenges with operational stability and scalability.
  • A key limitation is the lack of reliable, low-cost redox-active absorbent materials.
  • Existing thermochemical processes for CO2 capture have inherent shortcomings.

Purpose of the Study:

  • To introduce a novel class of chemically robust and economical redox-tunable Brønsted acids.
  • To demonstrate the application of these acids in electrifying amine carbon capture.
  • To provide a sustainable alternative to conventional carbon capture technologies.

Main Methods:

  • Development of redox-tunable Brønsted acids with reversible pKa tuning via electrochemical potential.
  • Utilizing proton-coupled electron transfer for amine regeneration in CO2 separation.
  • Testing the operational stability of the acids in a symmetric carbon capture flow cell.

Main Results:

  • The redox-tunable acids demonstrated a reversible pKa tunability over 20 units in organic solvents.
  • Efficient regeneration of classic amines for CO2 separation was achieved.
  • The materials maintained chemical integrity for over 400 hours of operation under relevant conditions.
  • The electrochemical approach mitigated shortcomings of thermochemical carbon capture.

Conclusions:

  • Electrifying amine carbon capture with redox-tunable Brønsted acids offers an energy-efficient and cost-effective solution.
  • This technology presents a stable and scalable drop-in replacement for incumbent amine scrubbing processes.
  • The developed materials pave the way for more sustainable CO2 mitigation strategies.