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Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

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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...
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Preparation of 1° Amines: Azide Synthesis01:22

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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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Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN101:14

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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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Diazonium Group Substitution: –OH and –H01:19

Diazonium Group Substitution: –OH and –H

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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.
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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
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Tailoring Azo-Bridged Nitropyrazoles: Enhancing Energy Thresholds through Complete Functionalization.

Wen-Shuai Dong1, Meiqi Xu1, Qamar-Un-Nisa Tariq1

  • 1State Key Laboratory of Explosion Science and Safety Protection, Beijing Institute of Technology, Beijing 100081, China.

The Journal of Organic Chemistry
|March 24, 2025
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Summary

Researchers synthesized a new high-energy material, BLG-101, using an energetic block design. This compound shows superior detonation performance compared to CL-20, offering a new path for high-energy density materials.

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Area of Science:

  • Energetic Materials Science
  • Organic Chemistry
  • Materials Engineering

Background:

  • High-energy density materials (HEDMs) are crucial for various applications, but current limitations in energy output and stability persist.
  • Nitropyrazole derivatives are a promising class of HEDMs, yet their full potential remains underexplored due to design constraints.

Purpose of the Study:

  • To synthesize and characterize a novel high-energy density material, 1,2-bis(4-azido-3,5-dinitropyrazolyl) diazene (BLG-101).
  • To evaluate the energetic performance, thermal stability, and mechanical sensitivity of BLG-101.
  • To explore an integrated design strategy for enhancing nitropyrazole-based energetic compounds.

Main Methods:

  • Energetic block design strategy incorporating a long nitrogen chain.
  • Synthesis of 1,2-bis(4-azido-3,5-dinitropyrazolyl) diazene (BLG-101).
  • Measurement of crystal density, enthalpy of formation, thermal stability, detonation velocity (VD), heat of detonation (Q), and mechanical sensitivity (impact (IS) and friction (FS)).

Main Results:

  • BLG-101 achieved a high crystal density of 1.924 g·cm-3 and measured density of 1.89 g·cm-3.
  • Exceptional detonation performance was observed: VD = 9800 m·s-1 and Q = 6893 kJ·kg-1, outperforming CL-20.
  • BLG-101 exhibited higher mechanical sensitivity (IS = 3.6 J, FS = 32 N) compared to CL-20 (IS = 4 J, FS = 48 N).

Conclusions:

  • The integrated design approach, combining nitro, azide, and elongated nitrogen chains on a pyrazole framework, significantly boosts energetic performance.
  • BLG-101 represents a breakthrough in overcoming energy limitations of nitropyrazole derivatives.
  • This study provides a novel synthetic pathway for designing next-generation high-energy density materials.