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Hydroboration-Oxidation of Alkenes03:08

Hydroboration-Oxidation of Alkenes

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In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
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A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn stereochemistry.
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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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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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The acid-catalyzed addition of water to the double bond of alkenes is a large-scale industrial method used to synthesize low-molecular-weight alcohols. An acidic atmosphere is required to allow the hydrogen in the water molecule to act as an electrophile and attack the double bond in an alkene. The addition of a proton to the double bond creates a carbocation intermediate. The proton preferentially bonds to the less substituted end of the double bond to create a more stable carbocation...
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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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Synthesis of a Borylated Ibuprofen Derivative Through Suzuki Cross-Coupling and Alkene Boracarboxylation Reactions
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Borocation catalysis.

P Eisenberger1, C M Crudden

  • 1Department of Chemistry, Queen's University, 90 Bader Lane, Kingston, Ontario K7L 3N5, Canada. cruddenc@chem.queensu.ca.

Dalton Transactions (Cambridge, England : 2003)
|March 16, 2017
PubMed
Summary
This summary is machine-generated.

Borocations, particularly tricoordinate borenium ions, show catalytic reactivity in frustrated Lewis pair processes. Their stability and reactivity are predictable, enabling organic molecule transformations.

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Area of Science:

  • Organoboron chemistry
  • Catalysis
  • Lewis acid chemistry

Background:

  • Frustrated Lewis pairs (FLPs) are Lewis acids and bases that do not associate due to steric hindrance.
  • Borocations are positively charged boron-containing species with unique Lewis acidic properties.
  • Understanding the reactivity of borocations is crucial for developing new catalytic systems.

Purpose of the Study:

  • To describe the synthesis, stability, and catalytic reactivity of borocations.
  • To investigate the role of substituents in stabilizing borocations.
  • To explore the application of borocations in frustrated Lewis pair-type reactions and organic transformations.

Main Methods:

  • Synthesis of various borocations.
  • Stability studies of synthesized borocations.
  • Evaluation of catalytic activity in organic reactions.
  • Computational analysis of electronic and steric effects on reactivity.

Main Results:

  • Borocations exhibit tunable stability and reactivity based on their structure and substituents.
  • Tricoordinate borenium ions demonstrate significant catalytic potential.
  • Predictable reactivity patterns were established for different borocations.
  • Successful application of borocations in catalyzing organic transformations was achieved.

Conclusions:

  • Borocations, especially borenium ions, are effective catalysts in FLP chemistry.
  • Substituent effects are key to controlling borocation stability and reactivity.
  • Borocations offer a promising platform for novel catalytic applications in organic synthesis.