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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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Amides to Carboxylic Acids: Hydrolysis01:28

Amides to Carboxylic Acids: Hydrolysis

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Amides can undergo either acid-catalyzed hydrolysis or base-promoted hydrolysis through a typical nucleophilic acyl substitution. Each hydrolysis requires severe conditions.
Acid-catalyzed hydrolysis:
Hydrolysis of amides under acidic conditions yields carboxylic acids. Since the reaction occurs slowly, hydrolysis requires the conditions of heat.
The mechanism begins with the protonation of the carbonyl oxygen by the acid catalyst. The protonation makes the amide carbonyl carbon more...
3.1K
Preparation of 1° Amines: Azide Synthesis01:22

Preparation of 1° Amines: Azide Synthesis

3.9K
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...
3.9K
Preparation of Amines: Alkylation of Ammonia and Amines01:30

Preparation of Amines: Alkylation of Ammonia and Amines

3.3K
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...
3.3K
Amines to Alkenes: Hofmann Elimination01:16

Amines to Alkenes: Hofmann Elimination

2.5K
Alkenes can be obtained from amines via an E2 elimination. The amine is first converted into a good leaving group, such as a quaternary ammonium salt. This is accomplished by treating the amine with an excess of alkyl halide, which results in a halide salt. Next, the halide salt is transformed into a hydroxide salt that functions as a base to enable elimination.
Under thermal conditions, the hydroxide can abstract a proton from the β carbon; this generates an alkene with the simultaneous...
2.5K
Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation02:47

Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation

17.9K
Introduction
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
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Ammonium-Binding Bifunctional Aza-Crown Ether Catalysts for Substrate-Selective Hydroxyl Functionalization.

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This study introduces a novel macrocyclic catalyst for selective O-silylation of ammonium alcohols. The bifunctional catalyst achieves high substrate selectivity using noncovalent interactions, outperforming aliphatic alcohols.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Supramolecular Chemistry

Background:

  • Selective functionalization of alcohols is crucial in organic synthesis.
  • Distinguishing between different alcohol types, like ammonium and aliphatic alcohols, presents a significant challenge.
  • Developing catalysts that leverage noncovalent interactions for substrate recognition is an active area of research.

Purpose of the Study:

  • To design and synthesize a novel bifunctional macrocyclic catalyst.
  • To achieve high substrate selectivity in O-silylation reactions.
  • To elucidate the mechanistic basis for the observed selectivity.

Main Methods:

  • Synthesis of a bifunctional macrocyclic catalyst incorporating crown ether and N-methyl imidazole moieties.
  • O-silylation reactions using the developed catalyst with ammonium and aliphatic alcohols.
  • Mechanistic investigations including studies on receptor size, conformational preorganization, and hydrogen-bonding interactions.

Main Results:

  • The macrocyclic catalyst demonstrated high selectivity for O-silylation of ammonium alcohols over aliphatic alcohols (>20:1).
  • The catalyst's efficacy is attributed to the synergistic action of crown ether ammonium-binding receptors and the N-methyl imidazole catalytic motif.
  • Mechanistic studies highlighted the critical roles of receptor size, preorganization, and hydrogen-bonding acceptor units in achieving selectivity.

Conclusions:

  • A novel bifunctional macrocyclic catalyst has been successfully developed.
  • The catalyst enables highly selective O-silylation of ammonium alcohols through strategic noncovalent interactions.
  • Understanding the structure-selectivity relationship provides a foundation for designing future sophisticated catalysts.