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Related Concept Videos

Acid Halides to Alcohols: LiAlH4 Reduction01:19

Acid Halides to Alcohols: LiAlH4 Reduction

Acid halides are reduced to alcohols in the presence of a strong reducing agent like lithium aluminum hydride.
The mechanism proceeds in three steps. First, the nucleophilic hydride ion attacks the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs as a leaving group, generating an aldehyde. A second nucleophilic attack by the hydride yields an alkoxide ion, which, upon protonation, gives a primary alcohol as...
Nitriles to Amines: LiAlH4 Reduction00:55

Nitriles to Amines: LiAlH4 Reduction

Nitriles are reduced to amines in the presence of strong reducing agents like lithium aluminum hydride through a typical nucleophilic acyl substitution. The reaction requires two equivalents of the reducing agent. The reducing agent acts as a source of hydride ions.
As shown below, the mechanism involves three steps. Firstly, the hydride ion acting as a nucleophile attacks the nitrile carbon to form an anion. In the second step, a second equivalent of the hydride ion attacks the anion to...
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.
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.

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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

Hypergolic N,N-dimethylhydrazinium ionic liquids.

Yanqiang Zhang1, Haixiang Gao, Yong Guo

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

Chemistry (Weinheim an Der Bergstrasse, Germany)
|February 6, 2010
PubMed
Summary

New N,N-dimethylhydrazinium ionic liquids (ILs) were synthesized and tested for hypergolic properties. Some of these novel energetic materials show potential as bipropellants due to their rapid ignition with white-fuming nitric acid.

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Green Synthesis of Quinoline-Based Ionic Liquid

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Area of Science:

  • Energetic materials science
  • Ionic liquid synthesis
  • Propellant chemistry

Background:

  • Ionic liquids (ILs) offer tunable properties for various applications.
  • N,N-dimethylhydrazine derivatives are explored for energetic applications.
  • Hypergolic propellants require rapid ignition upon contact with an oxidizer.

Purpose of the Study:

  • To synthesize novel N,N-dimethylhydrazinium dicyanamide and nitrocyanamide ionic liquids.
  • To characterize the physicochemical and energetic properties of these new ILs.
  • To evaluate the hypergolic performance of these ILs with white-fuming nitric acid (WFNA).

Main Methods:

  • Quaternization of N,N-dimethylhydrazine with alkyl halides.
  • Metathesis reactions with silver dicyanamide or silver nitrocyanamide.
  • Measurement of physicochemical properties (melting point, density, viscosity, etc.).
  • Calculation of energetic properties (heat of formation, detonation parameters).
  • Droplet tests with WFNA to determine ignition delay (ID) times.

Main Results:

  • Fourteen new N,N-dimethylhydrazinium salts were successfully prepared.
  • Key physicochemical and energetic properties were determined.
  • Hypergolic behavior was observed with WFNA, with ID times ranging from 22 to 1642 ms.
  • The influence of anions and alkyl-substituted cations on properties was elucidated.

Conclusions:

  • The synthesized N,N-dimethylhydrazinium salts represent a new class of energetic ionic liquids.
  • Several compounds demonstrated promising hypergolic characteristics.
  • These novel ILs hold potential for future bipropellant applications in rocketry.