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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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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.
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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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Halogenation is the addition of chlorine or bromine across the double bond in an alkene to yield a vicinal dihalide. The reaction occurs in the presence of inert and non-nucleophilic solvents, such as methylene chloride, chloroform, or carbon tetrachloride.
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Introduction to Electrophilic Addition Reactions of Alkenes02:24

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The double bond in a simple, unconjugated alkene is a region of high electron density that can act as a weak base or a nucleophile. The filled π orbital (HOMO) of the double bond can interact with the empty LUMO of an electrophile. A bonding interaction occurs when the electrophile attacks between the two carbons; the electrophile then accepts a pair of electrons from the π bond and undergoes addition across the double bond, yielding a single product.
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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
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Dual Chalcogen-Chalcogen Bonding Catalysis.

Wei Wang1, Haofu Zhu1, Lei Feng1

  • 1School of Chemistry and Chemical Engineering , Shandong University , Jinan 250100 , China.

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|January 22, 2020
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This summary is machine-generated.

Nature

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Area of Science:

  • Organic Chemistry
  • Supramolecular Chemistry
  • Catalysis

Background:

  • Noncovalent S···O bonding influences protein structure.
  • Utilizing weak noncovalent forces for chemical reactions is challenging.
  • Conventional Rauhut-Currier reactions need strong Lewis bases.

Purpose of the Study:

  • To develop a dual chalcogen-chalcogen bonding catalysis strategy.
  • To enable Rauhut-Currier-type reactions using novel catalytic interactions.
  • To achieve regioselectivity and broader substrate scope in chemical synthesis.

Main Methods:

  • A dual chalcogen-chalcogen bonding catalysis strategy was designed.
  • Simultaneous Se···O bonding interactions were employed between donors, enone, and alcohol.
  • A consecutive dual Se···O bonding catalysis approach was implemented.

Main Results:

  • The dual chalcogen-chalcogen bonding strategy successfully facilitated Rauhut-Currier-type reactions.
  • The method enabled reactions with less reactive and conventionally inaccessible substrates.
  • Regioselectivity was achieved by differentiating alkyl groups through chalcogen bonding.

Conclusions:

  • Dual chalcogen-chalcogen bonding offers a novel catalytic approach for organic synthesis.
  • This strategy overcomes limitations of conventional methods for Rauhut-Currier reactions.
  • The approach demonstrates precise control over reactivity and selectivity using weak interactions.