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Preparation of 1° Amines: Azide Synthesis01:22

Preparation of 1° Amines: Azide Synthesis

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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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Base-Catalyzed Ring-Opening of Epoxides02:26

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Due to their highly strained structures, epoxides can readily undergo ring-opening reactions through nucleophilic substitution, either in the presence of an acid or a base. The nucleophilic substitution reactions in the presence of acid are called acid-catalyzed ring-opening reactions, and nucleophilic substitution reactions in the presence of a base are called base-catalyzed ring-opening reactions. Epoxides undergo base-catalyzed ring-opening reactions in the presence of a strong nucleophile...
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Acid-Catalyzed Ring-Opening of Epoxides02:24

Acid-Catalyzed Ring-Opening of Epoxides

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Epoxides that are three-membered ring systems are more reactive than other cyclic and acyclic ethers. The high reactivity of epoxides originates from the strain present in the ring. This ring strain acts as a driving force for epoxides to undergo ring-opening reactions either with halogen acids or weak nucleophiles in the presence of mild acid. The acid catalyst converts the epoxide oxygen, a poor leaving group, into an oxonium ion, a better leaving group, making the reaction feasible. The...
8.0K
Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions01:20

Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions

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Arenediazonium substitution reactions occur when the diazonium group is substituted by various functional groups such as halides, hydroxyl, nitrile, etc. For instance, arenediazonium salts react with copper(I) salts of chloride, bromide, or cyanide to form corresponding aryl chlorides, bromides, and nitriles. These reactions are named Sandmeyer reactions. Although the mechanism of this reaction is complicated, as illustrated in Figure 1, they are believed to progress via an aryl copper...
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ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH301:11

ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH3

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All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...
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Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN101:14

Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN1

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Treating arylamines with nitrous acid gives aryldiazonium salts that are effective substrates in nucleophilic aromatic substitution reactions. The diazonio group in these salts can be easily displaced by different nucleophiles, yielding a wide variety of substituted benzenes. The leaving group departs as nitrogen gas, and this easy elimination is the driving force for the substitution reaction.
In the Sandmeyer reaction, for example, the diazonio group is replaced by a chloro, bromo,...
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Related Experiment Video

Updated: Nov 10, 2025

Preparation of Contiguous Bisaziridines for Regioselective Ring-Opening Reactions
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Alkylative Aziridine Ring-Opening Reactions.

Jieun Choi1, Taehwan Yu1, Hyun-Joon Ha1

  • 1Department of Chemistry, Hankuk University of Foreign Studies, Yongin 17035, Korea.

Molecules (Basel, Switzerland)
|April 3, 2021
PubMed
Summary
This summary is machine-generated.

This study demonstrates a new method for activating strained aziridine rings via alkylation. The activated aziridinium ion readily undergoes ring-opening reactions, enabling the synthesis of diverse N-alkylated amine molecules.

Keywords:
alkylativeamineaziridineaziridinium ionnon-activatedregioselectivityring-opening

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Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry

Background:

  • Aziridine rings are highly strained three-membered heterocycles.
  • Ring opening of aziridines is a key transformation in organic synthesis.

Purpose of the Study:

  • To develop an efficient method for the synthesis of N-alkylated amine-containing molecules.
  • To explore the reactivity of alkylated aziridinium ions with various nucleophiles.

Main Methods:

  • Activation of the aziridine ring nitrogen via alkylation with methyl, ethyl, or allyl groups.
  • Ring opening of the activated aziridinium ion using external nucleophiles like acetate and azide.

Main Results:

  • Successful activation of the aziridine ring as an aziridinium ion.
  • Demonstration of facile ring opening with acetate and azide nucleophiles.
  • Synthesis of various N-alkylated amine-containing molecules with nucleophile incorporation at alpha or beta positions.

Conclusions:

  • Alkylation of aziridines provides a straightforward route to aziridinium ions.
  • This methodology offers a versatile approach for synthesizing complex amine derivatives.
  • The reaction allows for controlled introduction of nucleophiles into N-alkylated amine structures.