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Related Concept Videos

Catalysis02:50

Catalysis

The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation02:47

Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation

Introduction
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
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.
Catalysis01:27

Catalysis

Catalysis influences the rate of chemical reactions by providing an alternative reaction pathway with lower activation energy. A catalyst speeds up a reaction, but it is not consumed during the process. The fundamental principle of catalysis is the ability of a catalyst to alter the reaction mechanism, often introducing a more efficient pathway than the uncatalyzed process.In a catalyzed reaction, the catalyst participates directly in the reaction mechanism. It interacts with reactants to form...
Heterogeneous Catalysis01:22

Heterogeneous Catalysis

Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...

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Related Experiment Video

Updated: Jul 10, 2026

Synthesis of Antiviral Tetrahydrocarbazole Derivatives by Photochemical and Acid-catalyzed C-H Functionalization via Intermediate Peroxides (CHIPS)
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A highly active, isospecific cobalt catalyst for propylene oxide polymerization.

Kathryn L Peretti1, Hiroharu Ajiro, Claire T Cohen

  • 1Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1301, USA.

Journal of the American Chemical Society
|August 18, 2005
PubMed
Summary

A new cobalt complex, (salph)CoOAc, efficiently catalyzes the isospecific polymerization of racemic propylene oxide. This discovery advances catalytic methods for producing stereoregular polymers from epoxides.

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Area of Science:

  • Polymer Chemistry
  • Organometallic Chemistry
  • Catalysis

Background:

  • Propylene oxide polymerization is crucial for producing polyethers.
  • Achieving isospecificity in propylene oxide polymerization remains a challenge.
  • Cobalt complexes are known catalysts for epoxide polymerization.

Purpose of the Study:

  • To discover a novel catalyst for the isospecific polymerization of racemic propylene oxide.
  • To investigate the catalytic activity and selectivity of cobalt complexes in epoxide polymerization.

Main Methods:

  • Synthesis and characterization of a cobalt complex: (salph)CoOAc, where salph = N,N'-bis(3,5-di-tert-butylsalicylidine-1,2-benzenediamine).
  • Testing the catalytic performance of the cobalt complex in the polymerization of rac-propylene oxide.
  • Analysis of polymer stereochemistry to determine isospecificity.

Main Results:

  • The cobalt complex ((salph)CoOAc) demonstrated high activity in the polymerization.
  • The catalyst enabled the isospecific polymerization of racemic propylene oxide.
  • The stereochemical outcome of the polymerization was controlled by the catalyst.

Conclusions:

  • A highly active and selective cobalt catalyst for isospecific propylene oxide polymerization has been identified.
  • This catalyst offers a promising route for the synthesis of stereoregular poly(propylene oxide).
  • The findings contribute to the development of advanced catalysts for controlled polymer synthesis.