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Related Concept Videos

Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
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Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

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Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
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Carboxylic Acids to Methylesters: Alkylation using Diazomethane01:33

Carboxylic Acids to Methylesters: Alkylation using Diazomethane

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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.
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Reduction of Alkenes: Catalytic Hydrogenation02:13

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Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
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Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction01:22

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The radical dimerization of ketones or aldehydes gives vicinal diols through a pinacol coupling reaction. However, the behavior of titanium metals used for the reaction as a source of electrons is unusual. When the reaction is carried out in the presence of titanium, diols can be isolated at low temperatures. Else titanium further reacts with diols, forming alkenes through the McMurry reaction.
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Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

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Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
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Resource Recycling of Red Soil to Synthesize Fe2O3/FAU-type Zeolite Composite Material for Heavy Metal Removal
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Transition-Metal-Free Aluminosilicate Small-Pore Zeolites Upgrade Methane to Light Olefins.

Peipei Xiao1, Xiaomin Tang2, Jingyi Tan2,3

  • 1Institute of Integrated Research, Institute of Science Tokyo, 4259 Nagatsuta, Midori-ku, Yokohama 226-8501, Japan.

Journal of the American Chemical Society
|September 5, 2025
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Summary

This study demonstrates that small-pore zeolites, like SSZ-13, can efficiently convert methane directly into light olefins. This transition-metal-free approach offers a high-efficiency, low-energy pathway for producing valuable chemicals from methane.

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Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
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Area of Science:

  • Catalysis
  • Materials Science
  • Chemical Engineering

Background:

  • Directly converting methane to value-added chemicals is a significant challenge in chemistry.
  • Transition-metal catalysts are commonly used for methane conversion, but alternatives are sought.
  • Zeolites have shown potential in activating methane and nitrous oxide to methanol.

Purpose of the Study:

  • To explore the use of different zeolite topologies for methane oxidation.
  • To identify small-pore zeolites capable of directly upgrading methane to light olefins.
  • To elucidate the active sites and reaction mechanism for this conversion.

Main Methods:

  • Screening of various zeolite topologies for methane oxidation.
  • Performance evaluation of CHA-type zeolite (SSZ-13) for methane to light olefins conversion.
  • Density Functional Theory (DFT) calculations to identify active sites.
  • Analysis of zeolite acidity's role in the reaction pathway.

Main Results:

  • CHA-type zeolite (SSZ-13) achieved 90.5% selectivity to light olefins with 5.3% CH4 conversion at 350 °C.
  • Penta-coordinated Al species were identified as active centers for methane activation.
  • Non-framework tetra-coordinated Al species were confirmed as the active sites via DFT.
  • Zeolite acidity was found to influence the tandem conversion of methanol to light olefins.

Conclusions:

  • Small-pore aluminosilicate zeolites, specifically SSZ-13, can directly upgrade methane to light olefins via methanol.
  • Transition-metal-free zeolites act as bifunctional catalysts for this efficient, low-energy process.
  • This method offers a novel, sustainable route for light olefin production from methane.