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Heterogeneous Catalysis01:22

Heterogeneous Catalysis

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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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Radical Reactivity: Concentration Effects01:20

Radical Reactivity: Concentration Effects

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In a radical reaction, the concentration of starting materials governs the selectivity of a radical. For example, the reaction between an alkyl halide and an alkene, in the presence of tin hydride and AIBN, begins with the generation of a tin radical. The generated radical then abstracts halogen from the alkyl halide, producing an alkyl radical. This alkyl radical can either react with tin hydride, yielding an alkane, or add to an alkene, generating a nitrile-stabilized radical, eventually...
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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
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Catalysis02:50

Catalysis

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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.
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Introduction to Mechanisms of Enzyme Catalysis01:13

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For many years, scientists thought that enzyme-substrate binding took place in a simple "lock-and-key" fashion. This model stated that the enzyme and substrate fit together perfectly in one instantaneous step. However, current research supports a more refined view scientists call induced fit. The induced-fit model expands upon the lock-and-key model by describing a more dynamic interaction between enzyme and substrate. As the enzyme and substrate come together, their interaction causes...
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Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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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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Selectivity Effects in Bimetallic Catalysis.

Neal P Mankad1

  • 1Department of Chemistry, University of Illinois at Chicago, 845 W. Taylor St. M/C 111, Chicago, IL, 60607, USA. npm@uic.edu.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|February 17, 2016
PubMed
Summary
This summary is machine-generated.

Bimetallic catalysts offer new ways to optimize chemical reactions beyond single-site catalysts. Understanding bimetallic effects on selectivity is key to developing advanced homogeneous catalysis systems.

Keywords:
cooperative effectsheterometallic complexeshomogeneous catalysismetal-metal interactionsorganometallic chemistry

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Area of Science:

  • Homogeneous catalysis
  • Organometallic chemistry

Background:

  • Traditional single-site catalysts are optimized by metal identity and ligand properties.
  • Bimetallic catalysts introduce new optimization parameters: nuclearity and metal pairing.

Purpose of the Study:

  • To highlight the impact of bimetallic catalysts on reaction selectivity.
  • To understand the origin of observed bimetallic selectivity effects.

Main Methods:

  • Review of recent literature on bimetallic catalysis.
  • Analysis of case studies demonstrating bimetallic effects.

Main Results:

  • Bimetallic catalysts influence chemo-, regio-, and stereoselectivity.
  • New optimization parameters (nuclearity, pairing) are available.

Conclusions:

  • Harnessing bimetallic effects is crucial for advancing homogeneous catalysis.
  • Further understanding of bimetallic interactions will enable the design of superior catalysts.