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Hydroboration-Oxidation of Alkenes03:08

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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.
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Introduction
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ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH301:11

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All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...
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Bromination and chlorination of aromatic rings by electrophilic aromatic substitution reactions are easily achieved, but fluorination and iodination are difficult to achieve. Fluorine is so reactive that its reaction with benzene is difficult to control, resulting in poor yields of monofluoroaromatic products. To address this, Selectfluor reagent is used as a fluorine source in which a fluorine atom is bonded to a positively charged nitrogen.
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The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
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Development of electronically tuneable N-heterocyclic borates.

I J Huerfano1, Evgueni Gorobets1, Wen Zhou1

  • 1Department of Chemistry, University of Calgary, Calgary, AB T2N 1N4, Canada. jeffrey.vanhumbec1@ucalgary.ca.

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|June 18, 2025
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Summary
This summary is machine-generated.

Researchers synthesized novel protonated borates with N-heterocyclic substituents, offering tuneable Lewis basicity and Brønsted-Lowry acidity for versatile chemical applications.

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Area of Science:

  • Organometallic Chemistry
  • Supramolecular Chemistry
  • Acid-Base Chemistry

Background:

  • Borate compounds are versatile in chemical synthesis and catalysis.
  • N-heterocyclic arenes offer unique electronic and steric properties.
  • Tuneable Lewis basicity and Brønsted-Lowry acidity are crucial for reagent design.

Purpose of the Study:

  • To synthesize and characterize novel borates featuring N-heterocyclic arene substituents.
  • To investigate the tuneable electronic and redox properties of these novel borates.
  • To explore their potential as Brønsted-Lowry acids and their salt derivatives.

Main Methods:

  • Synthesis of N-heterocyclic substituted borates.
  • Characterization using spectroscopic techniques (e.g., NMR).
  • Evaluation of Brønsted-Lowry acidity via pKa bracketing and kinetic studies.

Main Results:

  • Successful synthesis of novel protonated borates with N-heterocyclic substituents.
  • Demonstrated tuneable Lewis basicity through protonation of nitrogen atoms.
  • Quantified Brønsted-Lowry acidity and proton kinetic accessibility.

Conclusions:

  • N-heterocyclic borates provide a tunable platform for acid-base chemistry.
  • These compounds exhibit comparable properties to fluoroarene analogues with added benefits.
  • Synthesized salts offer potential for diverse future applications in catalysis and materials science.