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Nitriles to Amines: LiAlH4 Reduction00:55

Nitriles to Amines: LiAlH4 Reduction

3.4K
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...
3.4K
Preparation of Amines: Reduction of Amides and Nitriles01:13

Preparation of Amines: Reduction of Amides and Nitriles

2.4K
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,...
2.4K
Preparation of Amines: Reduction of Oximes and Nitro Compounds01:29

Preparation of Amines: Reduction of Oximes and Nitro Compounds

3.6K
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,...
3.6K
Reduction of Alkynes to trans-Alkenes: Sodium in Liquid Ammonia02:10

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

9.2K
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,...
9.2K
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

3.3K
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...
3.3K
Nitriles to Ketones: Grignard Reaction00:57

Nitriles to Ketones: Grignard Reaction

4.0K
Organomagnesium halides, commonly known as Grignard reagents, convert nitriles to ketones and proceed through a nucleophilic acyl substitution. Nitriles react with a Grignard reagent, followed by an aqueous acid, to yield ketones. The reaction introduces a new carbon–carbon bond. The alkyl–magnesium bond in the Grignard reagent is highly polar, so the alkyl carbon develops a carbanionic character and acts as a nucleophile.
The mechanism begins with a nucleophilic attack by the Grignard...
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Supercritical Nitrogen Processing for the Purification of Reactive Porous Materials
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Reductions of Arenes using a Magnesium-Dinitrogen Complex.

Matthew J Evans1, Jeremy Mullins1, Rahul Mondal1

  • 1School of Chemistry, Monash University, PO Box 23, 3800, Melbourne, Victoria, Australia.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|April 16, 2024
PubMed
Summary
This summary is machine-generated.

A novel magnesium dinitrogen complex facilitates "Birch-type" reductions of arenes, yielding cyclohexadiene products. This safe and easy-to-handle reagent offers mild reaction conditions for benzene, naphthalene, and anthracene reduction.

Keywords:
Birch reductionMagnesiumactivationarenedinitrogen

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Area of Science:

  • Organometallic Chemistry
  • Synthetic Chemistry
  • Catalysis

Background:

  • Arene reduction is a fundamental transformation in organic synthesis.
  • Traditional methods often require harsh conditions or hazardous reagents.
  • Development of new, milder, and safer reduction systems is highly desirable.

Purpose of the Study:

  • To introduce a novel anionic magnesium dinitrogen complex as a versatile reducing agent.
  • To explore its efficacy in the reduction of simple and substituted arenes.
  • To investigate its reactivity towards other unsaturated organic molecules.

Main Methods:

  • Synthesis and characterization of the [{K(TCHPNON)Mg}2(μ-N2)] complex.
  • Employing the complex as a reagent for arene reduction under mild conditions.
  • Utilizing spectroscopic and crystallographic methods to identify reaction intermediates and products.

Main Results:

  • The complex effectively mediates "Birch-type" reductions of benzene, naphthalene, and anthracene to 1,4-cyclohexadiene derivatives.
  • Reduction intermediates were observed and cyclohexadiene products released via protonolysis.
  • Reactivity with substituted arenes was less selective, with C-O and C-F activation observed for anisole and fluorobenzene, respectively.
  • Complexation with cyclooctatetraene (COT) yielded an aromatic dianion complex.

Conclusions:

  • The magnesium dinitrogen complex serves as a safe and effective precursor for "Birch-type" arene reductions.
  • The reagent demonstrates diverse reactivity, including C-H, C-O, C-F activation, and complexation with aromatic dianions.
  • This system offers a promising alternative for arene transformations under mild conditions.