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A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
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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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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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Functional groups are groups of atoms with specific chemical properties that occur within organic molecules and are sometimes denoted as “R”. Functional groups can “functionalize” a compound by enabling it to adopt different physical and chemical properties.
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Functional groups are group of atoms with specific chemical properties that occur within organic molecules and sometimes denoted as “R”. Functional groups are found along the carbon backbone of macromolecules can form chains or rings of carbon atoms. Functional groups can “functionalize” a compound by enabling it to adopt different physical and chemical properties.
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Functional group directed C-H borylation.

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Direct borylation of hydrocarbons using C-H activation is a versatile synthetic tool. Recent advances focus on directed borylation strategies, using directing groups for enhanced site-selectivity in C(sp2)-H and C(sp3)-H activation.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Synthetic Methodology

Background:

  • Direct borylation of hydrocarbons via C-H activation is a powerful synthetic strategy.
  • Organoboron compounds offer significant versatility in chemical synthesis.
  • Traditional catalytic systems are often insensitive to directing effects, with regioselectivity governed by sterics.

Purpose of the Study:

  • To summarize and discuss strategies for directed borylation reactions.
  • To highlight recent developments in site-selective borylation via C-H activation.
  • To review complementary approaches to traditional sterically controlled borylation.

Main Methods:

  • Review of literature on directed borylation reactions.
  • Analysis of strategies employing directing groups for C(sp2)-H and C(sp3)-H activation.
  • Discussion of catalytic systems and their regioselectivity.

Main Results:

  • Development of directed borylation strategies offers complementary approaches to sterically controlled methods.
  • Directing groups enable precise control over the site-selectivity of borylation reactions.
  • Significant progress has been made in achieving site-selective functionalization of hydrocarbons.

Conclusions:

  • Directed borylation represents a significant advancement in hydrocarbon functionalization.
  • These methods expand the synthetic utility of organoboron compounds.
  • Future research will likely focus on further refining selectivity and expanding substrate scope.