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Related Concept Videos

Preparation of 1° Amines: Azide Synthesis01:22

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...
Alkyl Halides02:45

Alkyl Halides

Structural Properties
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...
Diazonium Group Substitution: –OH and –H01:19

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.
Preparation of Nitriles01:12

Preparation of Nitriles

One of the common methods to prepare nitriles is the dehydration of amides. This method requires strong dehydrating agents like phosphorous pentoxide or boiling acetic anhydride for converting amides to nitriles. Another reagent namely, thionyl chloride also accomplishes the dehydration of amides, where amide acts as a nucleophile. The first step of the mechanism involves the nucleophilic attack by the amide on the thionyl chloride to form an intermediate. In the next step, the electron pairs...
Acid Halides to Alcohols: Grignard Reaction01:15

Acid Halides to Alcohols: Grignard Reaction

Organomagnesium halides, commonly known as Grignard reagents, convert acid halides to tertiary alcohols. The reaction requires two equivalents of the Grignard reagent and proceeds via a ketone intermediate.
Grignard reagents are a source of carbanions and function as nucleophiles. The mechanism begins with the nucleophilic attack by the carbanion at the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs,...
Carboxylic Acids to Methylesters: Alkylation using Diazomethane01:33

Carboxylic Acids to Methylesters: Alkylation using Diazomethane

Carboxylic acids react with diazomethane in an ether solvent via alkylation at the carboxylate oxygen atom to give methyl esters of the corresponding acid with excellent yields.

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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
06:44

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

Published on: March 24, 2018

Inorganic or organic azide-containing hypergolic ionic liquids.

Young-Hyuk Joo1, Haixiang Gao, Yanqiang Zhang

  • 1Department of Chemistry, University of Idaho, Moscow, Idaho 83844-2343, USA.

Inorganic Chemistry
|February 24, 2010
PubMed
Summary

New azide-functionalized ionic liquids show promise as safer, greener alternatives to toxic hydrazine fuels. These energetic ionic liquids exhibit hypergolic activity with common oxidizers, offering a viable replacement for traditional propellants.

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Green Synthesis of Quinoline-Based Ionic Liquid
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Highly Stereoselective Synthesis of 1,6-Ketoesters Mediated by Ionic Liquids: A Three-component Reaction Enabling Rapid Access to a New Class of Low Molecular Weight Gelators
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Highly Stereoselective Synthesis of 1,6-Ketoesters Mediated by Ionic Liquids: A Three-component Reaction Enabling Rapid Access to a New Class of Low Molecular Weight Gelators

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Last Updated: Jun 16, 2026

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Published on: March 24, 2018

Green Synthesis of Quinoline-Based Ionic Liquid
05:59

Green Synthesis of Quinoline-Based Ionic Liquid

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Highly Stereoselective Synthesis of 1,6-Ketoesters Mediated by Ionic Liquids: A Three-component Reaction Enabling Rapid Access to a New Class of Low Molecular Weight Gelators
06:31

Highly Stereoselective Synthesis of 1,6-Ketoesters Mediated by Ionic Liquids: A Three-component Reaction Enabling Rapid Access to a New Class of Low Molecular Weight Gelators

Published on: November 27, 2015

Area of Science:

  • Chemistry
  • Materials Science
  • Propulsion Engineering

Background:

  • Hydrazine-based fuels pose toxicity risks, driving research for safer alternatives.
  • Ionic liquids are emerging as promising energetic materials with tunable properties.
  • Green chemistry principles encourage the development of environmentally benign chemical processes and materials.

Purpose of the Study:

  • To synthesize novel azide-functionalized ionic liquids.
  • To evaluate the hypergolic activity of these ionic liquids with oxidizers.
  • To explore their potential as replacements for toxic hydrazine fuels.

Main Methods:

  • Synthesis of energetic ionic liquids via metathesis reactions.
  • Characterization of synthesized ionic liquids.
  • Testing hypergolic ignition with oxidizers like nitric acid and nitrogen tetraoxide (NTO).

Main Results:

  • Successfully synthesized energetic ionic liquids containing the 2-azido-N,N,N-trimethylethylammonium cation.
  • Demonstrated hypergolic activity of these new ionic liquids with 100% nitric acid and NTO.
  • Azide-functionalized ionic liquids show potential as hydrazine replacements.

Conclusions:

  • Azide-functionalized ionic liquids are effective hypergolic fuels.
  • These compounds offer a greener alternative to toxic hydrazine propellants.
  • Further research into energetic ionic liquids can advance safer propulsion technologies.