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Related Concept Videos

Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

3.5K
Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
3.5K
Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

2.0K
The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
2.0K
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

2.3K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
2.3K
Diazonium Group Substitution: –OH and –H01:19

Diazonium Group Substitution: –OH and –H

2.7K
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.
2.7K
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism01:37

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism

3.7K
Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.
3.7K
Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

2.9K
The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the...
2.9K

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Updated: Jun 2, 2025

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
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Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach

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Intramolecular Cyclization and Energetic Group Modifications for Thermally Stable and Low-Sensitivity Monocyclic

Changlin Zhou1,2, Qingshan Xie1, Junqi Wang1

  • 1College of Materials and Chemical Engineering, Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, China Three Gorges University, Yichang 443002, China.

Inorganic Chemistry
|January 13, 2025
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Summary

Researchers synthesized a highly stable zwitterionic energetic material with a record decomposition temperature. This breakthrough offers a promising pathway for developing high-energy, low-sensitivity explosives with enhanced safety characteristics.

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Microwave-Assisted Preparation of 1-Aryl-1H-pyrazole-5-amines
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Area of Science:

  • Energetic Materials Science
  • Organic Chemistry
  • Materials Science

Background:

  • Zwitterionic energetic materials present a unique combination of high performance and stability.
  • Synthesis and stability enhancement of these materials are significant challenges in the field.

Purpose of the Study:

  • To report the synthesis of a highly stable dinitromethyl-functionalized zwitterionic compound.
  • To explore chemical modifications for zwitterion-to-zwitterion transformations.
  • To evaluate the physicochemical properties of novel energetic zwitterions and their salts.

Main Methods:

  • Intramolecular cyclization of a trinitromethyl-functionalized hydrazone precursor.
  • Chemical modifications including nitration and fluorination for zwitterion transformations.
  • Synthesis of various salts (perchlorate, ammonium, guanidinium, potassium) of the energetic zwitterions.

Main Results:

  • A highly stable zwitterionic compound (4) was synthesized with a decomposition temperature of 215 °C.
  • Zwitterion-to-zwitterion transformations yielded nitramines (10, 12), with zwitterion 12 showing excellent thermal stability (181 °C) and a balance of high energy output and low sensitivity.
  • Potassium salt 15 exhibited superior thermal stability (233 °C), surpassing RDX.

Conclusions:

  • The study expands the design framework for energetic zwitterions.
  • The developed compounds contribute to the development of high-energy, low-sensitivity energetic materials.
  • Novel zwitterionic structures offer enhanced stability and performance for advanced energetic applications.