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A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
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The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
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Carbocations are one of the reaction intermediates formed during several nucleophilic substitutions or elimination reactions. A carbocation is an electron-deficient species with the central carbon atom having six electrons and three bonded atoms. The central carbon in a carbocation is sp2 hybridized with trigonal planar geometry. It has an empty p orbital perpendicular to the plane of the structure that can accept electrons. Thus, carbocations act as strong electrophiles and may react with any...
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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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Asymmetric C(sp3)-H borylation: an update.

Sumit Ghosh1, Anogh Ghosh1, Pranjal Pyne1

  • 1Department of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India. alakananda.hajra@visva-bharati.ac.in.

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Chiral organoboronates are vital for pharmaceuticals and materials. This review details recent advances in transition metal-catalyzed asymmetric C(sp3)-H borylation, a key synthetic strategy.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Synthetic Methodology

Background:

  • Chiral organoboronates are crucial building blocks in pharmaceuticals and materials science.
  • Traditional synthetic methods often lack efficiency and versatility.
  • Asymmetric catalysis offers a practical and beneficial strategy for preparing chiral compounds.

Purpose of the Study:

  • To provide a comprehensive overview of transition metal-catalyzed asymmetric C(sp3)-H borylation.
  • To analyze recent progress and developments in this synthetic field.
  • To highlight the utility of generated carbon-boron bonds.

Main Methods:

  • Focus on asymmetric catalysis for C-H functionalization.
  • Review of transition metal-catalyzed borylation reactions.
  • Analysis of strategies for aliphatic C(sp3)-H borylation.

Main Results:

  • Significant progress has been made in aliphatic C-H borylation.
  • Carbon-boron bonds are versatile intermediates for C-C, C-N, and C-O bond formation.
  • The review covers developments up to March 2022.

Conclusions:

  • Transition metal-catalyzed asymmetric C(sp3)-H borylation is a rapidly advancing field.
  • This methodology provides efficient access to valuable chiral organoboronates.
  • Continued research promises further innovations in synthetic chemistry.