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Related Concept Videos

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...
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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...
Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction01:22

Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction

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.
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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.
Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

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.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the surface of...

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

Published on: October 18, 2019

Cooperative multimetallic catalysis using metallosalens.

Robert M Haak1, Sander J Wezenberg, Arjan W Kleij

  • 1Institute of Chemical Research of Catalonia (ICIQ), Av. Països Catalans 16, 43007, Tarragona, Spain.

Chemical Communications (Cambridge, England)
|April 7, 2010
PubMed
Summary
This summary is machine-generated.

Multinuclear metallosalen catalysts enable cooperative bimetallic pathways for enhanced chemical transformations. These catalysts improve reaction rates and selectivity, enabling novel reactions not previously possible.

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Area of Science:

  • Coordination Chemistry
  • Catalysis
  • Organometallic Chemistry

Background:

  • Metallosalen complexes are known catalysts.
  • Cooperative bimetallic catalysis offers advantages in reactivity and selectivity.
  • Multinuclear catalysts can activate multiple metal centers simultaneously.

Purpose of the Study:

  • To review design principles for multinuclear metallosalen catalysts.
  • To highlight successful strategies for cooperative bimetallic activation.
  • To discuss the catalytic applications of these advanced catalysts.

Main Methods:

  • Literature review of multinuclear metallosalen catalyst research.
  • Analysis of cooperative bimetallic activation strategies.
  • Compilation of catalytic applications and performance data.

Main Results:

  • Simultaneous activation of two metal centers leads to enhanced reaction rates and selectivities.
  • Multinuclear metallosalen catalysts enable new chemical transformations.
  • Various design strategies have been successfully implemented.

Conclusions:

  • Multinuclear metallosalen catalysts are powerful tools for cooperative catalysis.
  • Strategic design allows for fine-tuning of catalytic activity and selectivity.
  • These catalysts open new avenues in synthetic chemistry.