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Related Concept Videos

Acid-Catalyzed Hydration of Alkenes02:45

Acid-Catalyzed Hydration of Alkenes

Alkenes react with water in the presence of an acid to form an alcohol. In the absence of acid, hydration of alkenes does not occur at a significant rate, and the acid is not consumed in the reaction. Therefore, alkene hydration is an acid-catalyzed reaction.
Aldehydes and Ketones with Water: Hydrate Formation01:20

Aldehydes and Ketones with Water: Hydrate Formation

An oxygen-based nucleophile, like water, can undergo addition reactions with aldehydes and ketones. The reaction leads to the formation of hydrates, also referred to as 1,1-diols or geminal diols.
The formation of hydrates is a reversible reaction. Hydrate formation is influenced by steric and electronic factors accompanying the alkyl substituents on the carbonyl group: The rate of hydrate formation increases with a decrease in the number of alkyl groups attached to the carbonyl carbon. Hence,...
Radical Formation: Homolysis00:54

Radical Formation: Homolysis

A bond is formed between two atoms by sharing two electrons. When this bond is broken by supplying sufficient energy, either two electrons can be taken up by one atom forming ions by the cleavage called heterolysis, or the two electrons are shared by two atoms, with one each creating radicals by the cleavage called homolysis.
Hydrolysis01:15

Hydrolysis

Overview
Hydrolysis is a chemical reaction in which the addition of water breaks down a polymer into its simpler monomer units. For example, peptides break into amino acids, carbohydrates into simple sugars, and DNA into nucleotides. Enzymes often facilitate these processes.
Hydrolysis Reverses Dehydration Synthesis
Complex carbohydrates can be broken down by breaking the bonds between individual sugar units. The reaction breaks a glycosidic bond as water is added to the compound. The...
Radical Formation: Abstraction00:47

Radical Formation: Abstraction

The electron of an atom can be abstracted from a compound by a relatively unstable radical to generate a new radical of relatively greater stability. For example, an initiator which forms radicals by homolysis can abstract a suitable species like a hydrogen atom or a halogen atom from a compound to generate a new radical. This ability of radicals to propagate by abstraction is a crucial feature of radical chain reactions.
Even though homolysis produces radicals, it is different from radical...
Alkynes to Aldehydes and Ketones: Acid-Catalyzed Hydration02:40

Alkynes to Aldehydes and Ketones: Acid-Catalyzed Hydration

Introduction
Analogous to alkenes, alkynes also undergo acid-catalyzed hydration. While the addition of water to an alkene gives an alcohol, hydration of alkynes produces different products such as aldehydes and ketones.

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Water attack umpolung aromatic systems to release hydrogen.

Tsun-Ren Chen1, Hsiu-Pen Lee, Jhy-Der Chen

  • 1Department of Chemical Biology, National Pingtung University of Education, Pingtung, Taiwan 90003, Republic of China. trchen@mail.npue.edu.tw

Inorganic Chemistry
|March 15, 2011
PubMed
Summary

Researchers synthesized novel iridium(III) complexes featuring benzoxazole ligands. One complex, (dfpbo)2Ir(Cl)(pph3), demonstrated catalytic activity for water splitting, showcasing potential in sustainable energy applications.

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Area of Science:

  • Organometallic Chemistry
  • Catalysis
  • Materials Science

Background:

  • Cyclometalated iridium(III) complexes are of interest due to their unique photophysical and catalytic properties.
  • Benzoxazole derivatives offer versatile scaffolds for ligand design in coordination chemistry.

Purpose of the Study:

  • To synthesize and characterize a new series of cyclometalated iridium(III) complexes incorporating benzoxazole ligands.
  • To investigate the structural features and catalytic potential of these novel iridium complexes, particularly for water splitting.

Main Methods:

  • Synthesis of iridium(III) complexes with general formula (C^N)2Ir(Cl)(pph3), where C^N represents cyclometalating benzoxazole-based ligands.
  • Structural characterization using X-ray crystallography.
  • Evaluation of catalytic activity for water splitting reactions.

Main Results:

  • Successful synthesis of three iridium(III) complexes: (dfpbo)2Ir(Cl)(pph3) (2a), (pbo)2Ir(Cl)(pph3) (2b), and (nbo)2Ir(Cl)(pph3) (2c).
  • X-ray crystallography confirmed the structures of complexes 2a, 2b, and 2c.
  • Complex 2a exhibited facile umpolung in the arylphosphine ligand's phenyl rings and demonstrated catalytic activity in water splitting.

Conclusions:

  • The study reports the successful synthesis and structural elucidation of novel cyclometalated iridium(III)-benzoxazole complexes.
  • Complex 2a shows promising catalytic activity for water splitting, highlighting its potential for further development in catalysis and energy conversion.