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Preparation of 1° Amines: Hofmann and Curtius Rearrangement Mechanism01:26

Preparation of 1° Amines: Hofmann and Curtius Rearrangement Mechanism

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The Hofmann and Curtius rearrangement reactions can be applied to synthesize primary amines from carboxylic acid derivatives such as amides and acyl azides. In the Hofmann rearrangement, a primary amide undergoes deprotonation in the presence of a base, followed by halogenation to generate an N-haloamide. A second proton abstraction produces a stabilized anionic species, which rearranges to an isocyanate intermediate via an alkyl group migration from the carbonyl carbon to the neighboring...
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Amines to Amides: Acylation of Amines01:19

Amines to Amides: Acylation of Amines

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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...
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Preparation of Amines: Alkylation of Ammonia and Amines01:30

Preparation of Amines: Alkylation of Ammonia and Amines

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Alkylation is one of the methods used to prepare amines. Direct alkylation of ammonia or a primary amine with an alkyl halide gives polyalkylated amines along with a quaternary ammonium salt through successive SN2 reactions. This process of making the quaternary salt through the direct alkylation method is called exhaustive alkylation.
Each alkylation step makes the nitrogen center more nucleophilic, which triggers successive alkylations until a quaternary ammonium salt is formed. Considering...
3.6K
Preparation of Amines: Reduction of Oximes and Nitro Compounds01:29

Preparation of Amines: Reduction of Oximes and Nitro Compounds

3.9K
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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Amides to Amines: LiAlH4 Reduction01:20

Amides to Amines: LiAlH4 Reduction

5.1K
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.
5.1K
Preparation of Amines: Reductive Amination of Aldehydes and Ketones01:38

Preparation of Amines: Reductive Amination of Aldehydes and Ketones

3.1K
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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Author Spotlight: Standardizing the Development of Amine-Based Silica Composites as CO2 Adsorbents for Direct Air Capture
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Review on CO2 Capture Using Amine-Functionalized Materials.

Jannis Hack1, Nobutaka Maeda1, Daniel M Meier1

  • 1Institute of Materials and Process Engineering (IMPE), School of Engineering (SoE), Zurich University of Applied Sciences (ZHAW), Winterthur CH-8400, Switzerland.

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|November 17, 2022
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Summary
This summary is machine-generated.

Amine-functionalized porous materials offer superior carbon dioxide (CO2) capture and regeneration efficiency compared to traditional methods. This review explores their mechanisms and a novel light-triggered desorption technique.

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Area of Science:

  • Environmental Science
  • Materials Science
  • Chemical Engineering

Background:

  • Global climate change necessitates effective carbon dioxide (CO2) capture technologies.
  • Traditional liquid amine scrubbing for CO2 capture is energy-intensive and corrosive.
  • Solid sorbent materials, including zeolites and metal-organic frameworks, are emerging alternatives.

Purpose of the Study:

  • To provide an overview of CO2 capture using various amines.
  • To explain the mechanistic aspects of CO2 adsorption by amine-functionalized materials.
  • To introduce a novel room-temperature, light-triggered CO2 desorption method.

Main Methods:

  • Review of existing literature on amine-based CO2 capture.
  • Analysis of mechanistic principles governing CO2 adsorption.
  • Discussion of visible/UV light-triggered CO2 desorption techniques.

Main Results:

  • Amine-functionalized porous materials demonstrate high CO2 adsorption capacity.
  • These materials exhibit excellent regeneration efficiency.
  • Visible/UV light-triggered desorption offers a low-energy regeneration pathway at room temperature.

Conclusions:

  • Amine-functionalized porous materials are promising for efficient CO2 capture.
  • Light-triggered desorption presents a sustainable and effective regeneration strategy.
  • Further research into current issues and future perspectives is warranted for practical application.