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Preparation of 1° Amines: Azide Synthesis

Preparation of 1° Amines: Azide Synthesis

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...

Nomenclature of Aryl and Heterocyclic Amines

Nomenclature of Aryl and Heterocyclic Amines

The simplest aromatic amine is phenylamine, which contains an –NH2 functionality directly attached to an aromatic ring. The name aniline is designated for this skeleton. As shown in Figure 1, the common names of the functionalized anilines involve prefixes ortho-, meta-, and para- to indicate the substitution position. Different functionalized aniline derivatives also have notable trivial names.

Diazonium Group Substitution: –OH and –H

Diazonium Group Substitution: –OH and –H

Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.

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

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

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...

[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement

[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement

The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.

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Updated: Jul 13, 2025

Preparation of Enantiopure Non-Activated Aziridines and Synthesis of Biemamide B, D, and epiallo-Isomuscarine

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9-Azahomocubane.

Tyler Fahrenhorst-Jones¹, David L Marshall², Jed M Burns¹

¹School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, 4072, Queensland, Australia.

Chemistry (Weinheim an Der Bergstrasse, Germany)

|October 12, 2023

Summary

This summary is machine-generated.

Researchers synthesized 9-azahomocubane, a stable secondary amine. Its basicity is lower than azabicyclo[2.2.1]heptane but similar to 1-azahomocubane, offering insights into strained amine chemistry.

Keywords:

azahomocubane cubane homocubane hydrocarbons strained molecules

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Published on: March 25, 2017

Area of Science:

Organic Chemistry
Synthetic Chemistry
Strain Chemistry

Background:

Homocubane is a strained cage hydrocarbon with distinct nitrogen substitution sites.
Position 1 substitution yields a tertiary amine, while position 9 yields a secondary amine.

Purpose of the Study:

To report the synthesis and characterization of 9-azahomocubane.
To analyze the physical properties and chemical reactivity of 9-azahomocubane.
To compare the basicity of 9-azahomocubane with related compounds.

Main Methods:

Synthesis of 9-azahomocubane.
Structural characterization (e.g., NMR, X-ray crystallography).
Physical property analysis and chemical reactivity studies.

Main Results:

Successful synthesis and isolation of 9-azahomocubane.
Confirmation of its predicted stability.
Observed significantly lower basicity compared to azabicyclo[2.2.1]heptane.
Basicity found to be similar to 1-azahomocubane.

Conclusions:

9-Azahomocubane is readily synthesized and stable.
The secondary amine in 9-azahomocubane exhibits unique basicity characteristics due to its strained cage structure.