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Preparation of 1° Amines: Gabriel Synthesis01:28

Preparation of 1° Amines: Gabriel Synthesis

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Direct alkylation is not a suitable method for synthesizing amines because it produces polyalkylated products. Gabriel synthesis is the most preferred method to exclusively make primary amines. The method uses phthalimide, which contains a protected form of nitrogen that participates in alkylation only once to predominantly give primary amines.
Strong bases like NaOH or KOH deprotonate the phthalimide to form the corresponding anion, which acts as a nucleophile. Further, the anion attacks an...
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Acid Halides to Amides: Aminolysis01:07

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Aminolysis is a nucleophilic acyl substitution reaction, where ammonia or amines act as nucleophiles to give the substitution product. Acid halides react with ammonia, primary amines, and secondary amines to yield primary, secondary, and tertiary amides, respectively.
In the first step of the aminolysis mechanism, the amine attacks the carbonyl carbon of the acyl chloride to form a tetrahedral intermediate. In the second step, the carbonyl group is re-formed with the elimination of a chloride...
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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...
5.0K
Amines to Amides: Acylation of Amines01:19

Amines to Amides: Acylation of Amines

3.7K
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: 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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Preparation of 1° Amines: Azide Synthesis01:22

Preparation of 1° Amines: Azide Synthesis

4.8K
Direct alkylation of ammonia produces polyalkylated amines, along with a quaternary ammonium salt. To exclusively prepare primary amines, the azide synthesis method can be used.
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...
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Copper-induced ammonia N-H functionalization.

María Álvarez1, Eleuterio Álvarez, Manuel R Fructos

  • 1Laboratorio de Catálisis Homogénea, Unidad Asociada al CSIC, CIQSO-Centro de Investigación en Química Sostenible and Departamento de Química, Universidad de Huelva, Campus de El Carmen, 21007 Huelva, Spain. perez@dqcm.uhu.es.

Dalton Transactions (Cambridge, England : 2003)
|February 18, 2016
PubMed
Summary
This summary is machine-generated.

Researchers activated ammonia using a copper catalyst, enabling new chemical reactions. This breakthrough facilitates the synthesis of glycinate derivatives from ammonia, a significant advancement in copper-catalyzed chemistry.

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Area of Science:

  • Inorganic Chemistry
  • Organometallic Chemistry
  • Catalysis

Background:

  • Ammonia activation is crucial for synthesizing nitrogen-containing compounds.
  • Copper complexes offer potential for catalytic ammonia functionalization.

Purpose of the Study:

  • To achieve activation of ammonia using a copper catalyst.
  • To explore the functionalization of activated ammonia.
  • To develop a catalytic system for ammonia transformation.

Main Methods:

  • Synthesis of Tp(Ms)Cu complexes, including the ammonia adduct Tp(Ms)Cu(NH3).
  • Spectroscopic and structural characterization of synthesized complexes.
  • Reaction of coordinated ammonia with electrophiles and catalytic functionalization with ethyl diazoacetate.

Main Results:

  • Successful synthesis and characterization of Tp(Ms)Cu(amine) complexes.
  • Demonstration of N-H cleavage and N-C bond formation in ammonia adducts.
  • Development of a copper-catalyzed method for ammonia functionalization with ethyl diazoacetate, yielding glycinate derivatives.

Conclusions:

  • The Tp(Ms)Cu core effectively activates ammonia for further reactions.
  • This work presents the first example of catalytic functionalization of ammonia using a copper-based system.
  • The developed methodology opens new avenues for synthesizing valuable nitrogen-containing compounds.