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Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

1.2K
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

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Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
3.3K
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

1.1K
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

2.2K
Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
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Carboxylic Acids to Acid Chlorides01:18

Carboxylic Acids to Acid Chlorides

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Carboxylic acids react with SOCl2 or PCl5 to form acid chlorides. Amongst the carboxylic acid derivatives, acid chlorides are the most reactive and synthetically important derivatives. They are useful reagents for Friedel–Crafts acylation of some aromatic compounds.
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Facile Access to Chelating CAArC-Phosphine (CAArCPhos) Palladium Complexes.

K Georg Leistikow1, Alexander Wingelstern1, Philipp Rohrmann1

  • 1Organisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany.

Angewandte Chemie (International Ed. in English)
|October 15, 2025
PubMed
Summary

Researchers developed a new synthesis for phosphine isoindolium salts using a novel protecting group strategy. This method creates unique chelating cyclic amino(aryl) carbene complexes, valuable in catalysis.

Keywords:
CAArCsChelating carbene ligandsC–H activationDirecting groupsPalladium

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Preparation and Use of Carbonyl-decorated Carbenes in the Activation of White Phosphorus
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Preparation and Use of Carbonyl-decorated Carbenes in the Activation of White Phosphorus
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Area of Science:

  • Organic Synthesis
  • Organometallic Chemistry
  • Catalysis

Background:

  • Developing novel synthetic routes for functionalized heterocyclic compounds is crucial in organic chemistry.
  • Phosphine-containing ligands are essential in homogeneous catalysis, particularly for palladium-catalyzed reactions.
  • Cyclic amino(aryl) carbene (CAArC) ligands offer unique electronic and steric properties for catalytic applications.

Purpose of the Study:

  • To present a new synthetic strategy for 4-(diphenyl-phosphino) isoindolium salts.
  • To synthesize novel chelating cyclic amino(aryl) carbene-phosphine (CAArCPhos) ligands and their palladium complexes.
  • To elucidate the mechanism of formation for these unique catalytic species.

Main Methods:

  • A novel protecting group strategy utilizing hemi-aminal methyl ether precursors.
  • Halogen-metal exchange and subsequent functionalization reactions.
  • Palladium(II) complex formation via a CMD-like metalation process.
  • Computational calculations to support mechanistic proposals.

Main Results:

  • Successful synthesis of 4-(diphenyl-phosphino) isoindolium salts.
  • Formation of the first examples of chelating cyclic amino(aryl) carbene-phosphine (CAArCPhos) palladium(II) complexes.
  • Identification of an acetate-assisted intramolecular palladation mechanism.

Conclusions:

  • The developed protecting group strategy is effective for synthesizing phosphine isoindolium salts.
  • The new CAArCPhos ligands form catalytically active palladium complexes.
  • The mechanistic study provides insight into the formation of these novel organometallic complexes.