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[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

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The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
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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.
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Phosphodiester Linkages01:01

Phosphodiester Linkages

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Overview
Phosphodiester bond forms when a phosphoric acid molecule (H3PO4) links with two hydroxyl groups (–OH) of two other molecules, forming two ester bonds. Two water molecules are released in this process. The phosphodiester bond is commonly found in nucleic acids (DNA and RNA) and plays a critical role in their structure and function.
Phosphodiester Bonds Link Nucleotides Together
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Structural Isomerism02:34

Structural Isomerism

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
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Diels–Alder Reaction: Characteristics of Dienophiles01:24

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In a Diels–Alder reaction, the diene is usually an electron-rich system and acts as a nucleophile, whereas the dienophile is electron-deficient and functions as an electrophile. Much like the diene, the nature of the dienophile significantly impacts the outcome of the reaction. 
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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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Ethylene Dimerization and Oligomerization Using Bis(phosphino)boryl Supported Ni Complexes.

Fanji Kong1, Pablo Ríos2, Conner Hauck1

  • 1Department of Chemistry, University of Virginia, Charlottesville, Virginia 22904, United States.

Journal of the American Chemical Society
|December 21, 2022
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Summary

New nickel catalysts facilitate ethylene dimerization and oligomerization, producing valuable butenes and higher olefins. This research reveals a novel cooperative nickel-boron activation mechanism for olefin synthesis.

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Area of Science:

  • Organometallic Chemistry
  • Catalysis
  • Polymer Science

Background:

  • Ethylene dimerization and oligomerization are crucial industrial processes for producing valuable chemicals.
  • Nickel catalysts are widely investigated for olefin transformations, but mechanistic understanding and selectivity control remain challenges.

Purpose of the Study:

  • To investigate the catalytic activity of bis(phosphino)boryl supported Ni(II) complexes for ethylene dimerization and oligomerization.
  • To elucidate the mechanism of ethylene activation and transformation mediated by these novel nickel catalysts.

Main Methods:

  • Synthesis and characterization of bis(phosphino)boryl supported Ni(II) complexes.
  • Catalytic testing of Ni(II) complexes with alkylaluminum(III) or methylaluminoxane co-catalysts for ethylene conversion.
  • Kinetic studies and mechanistic investigations to probe the reaction pathway.

Main Results:

  • Ni(II) complexes with bis(phosphino)boryl ligands efficiently catalyze ethylene dimerization and oligomerization.
  • High turnover frequencies and selectivities for 1-butene were achieved using specific catalyst precursors.
  • Ethylene oligomerization yielded a range of products from C4 to C20, with selectivity influenced by the catalyst structure.

Conclusions:

  • A cooperative B/Ni activation of ethylene, forming a 6-membered borametallacycle intermediate, is proposed as the key catalytic step.
  • The Ni-B unit plays a critical role in the catalytic cycle, differentiating from traditional Ni hydride or alkyl initiation pathways.
  • These findings offer new insights into the design of advanced nickel catalysts for selective olefin transformations.