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Related Concept Videos

Chemical Reactions in Aqueous Solutions03:03

Chemical Reactions in Aqueous Solutions

Chemical substances interact in many different ways. Certain chemical reactions exhibit common patterns of reactivity. Due to the vast number of chemical reactions, it becomes necessary to classify them based on the observed patterns of interaction.
Precipitation Reactions03:10

Precipitation Reactions

In a precipitation reaction, aqueous solutions of soluble salts react to give an insoluble ionic compound – the precipitate. The reaction occurs when oppositely charged ions in solution overcome their attraction for water and bind to each other, forming a precipitate that separates out from the solution. Since such reactions involve the exchange of ions between ionic compounds in aqueous solution, they are also referred to as double displacement, double replacement, exchange reactions, or...
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Precipitation of Ions

Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
Colloidal precipitates01:09

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Washing, Drying, and Ignition of Precipitates

After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...

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Updated: Jun 21, 2026

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

Published on: November 27, 2015

Ionic liquids in cross-coupling reactions: "liquid" solutions to a "solid" precipitation problem.

Hemant Choudhary1, Paula Berton, Gabriela Gurau

  • 1Department of Chemistry, The University of Alabama, Tuscaloosa, AL 35487, USA. rdrogers@ua.edu.

Chemical Communications (Cambridge, England)
|February 9, 2018
PubMed
Summary
This summary is machine-generated.

This study introduces a novel ionic liquid approach to prevent solid salt precipitation in cross-coupling reactions. Using [P66614]+ with basic anions creates an ionic liquid byproduct, simplifying reaction conditions.

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

Area of Science:

  • Organic Chemistry
  • Materials Science

Background:

  • Inorganic bases in cross-coupling reactions often lead to problematic solid salt precipitation.
  • This precipitation complicates reaction workup and can reduce yields.

Purpose of the Study:

  • To develop a method for suppressing solid salt formation in cross-coupling reactions.
  • To utilize ionic liquids as both bases and solvents to improve reaction efficiency.

Main Methods:

  • Combining basic anions with the trihexyl(tetradecyl)phosphonium ([P66614]+) cation to form ionic liquids.
  • Employing a specific ionic liquid base, [P66614][OH]·4MeOH, as both reactant and solvent.

Main Results:

  • Successfully generated an ionic liquid byproduct, preventing solid salt precipitation.
  • Demonstrated the dual role of the ionic liquid as both a base and solvent.

Conclusions:

  • Ionic liquids offer a viable solution to salt precipitation issues in cross-coupling reactions.
  • The use of [P66614][OH]·4MeOH streamlines reaction processes by acting as both base and solvent.