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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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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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Acid Halides to Amides: Aminolysis01:07

Acid Halides to Amides: Aminolysis

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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: Reductive Amination of Aldehydes and Ketones01:38

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

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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...
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Aldehydes and Ketones with Amines: Imine Formation Mechanism01:23

Aldehydes and Ketones with Amines: Imine Formation Mechanism

6.5K
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 PM6-FGC Method: Improved Corrections for Amines and Amides.

Martiño Ríos-García1, Berta Fernández1, Jesús Rodríguez-Otero1

  • 1Departamento de Química Física, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain.

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Summary

This study refines the PM6-FGC method for calculating noncovalent interactions using improved functional group corrections. New model compounds significantly enhance accuracy for amine and amide groups in molecular simulations.

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PM6 HamiltonianPM6-FGC approachnoncovalent interactionspotential energy curvessemiempirical methods

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Area of Science:

  • Computational Chemistry
  • Quantum Mechanics
  • Molecular Modeling

Background:

  • Semiempirical Quantum Mechanical (SQM) methods offer approximations for electronic structure calculations.
  • Pairwise analytical corrections can improve descriptions of noncovalent interactions.
  • The initial PM6-FGC method showed promise but had inaccuracies for amine/amide groups.

Purpose of the Study:

  • To enhance the accuracy of the PM6-FGC method for noncovalent interactions.
  • To address limitations in describing amine and amide functional groups.
  • To improve the calculation of interaction energies in molecular complexes.

Main Methods:

  • Developed pairwise analytical corrections (Functional Group Corrections - FGC) for the PM6 Hamiltonian.
  • Derived corrections based on high-level B3LYP-D3/def2-TZVP reference calculations.
  • Utilized methylamine and acetamide as improved model compounds for amine and amide groups, respectively.

Main Results:

  • The revised PM6-FGC method demonstrated significant improvements in calculating noncovalent interactions.
  • Accuracy was notably enhanced for interactions involving amine and amide functional groups.
  • Validation against established databases and peptide models confirmed the method's improved performance.

Conclusions:

  • Employing appropriate model compounds (methylamine, acetamide) is crucial for accurate functional group corrections.
  • The refined PM6-FGC method offers a more reliable approach for studying noncovalent interactions in relevant chemical systems.
  • This advancement benefits molecular simulations requiring precise descriptions of intermolecular forces.