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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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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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Halogenation is the addition of chlorine or bromine across the double bond in an alkene to yield a vicinal dihalide. The reaction occurs in the presence of inert and non-nucleophilic solvents, such as methylene chloride, chloroform, or carbon tetrachloride.
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Electrophilic addition of halogens to alkenes proceeds via a cyclic halonium ion to form a 1,2-dihalide or a vicinal dihalide.
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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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Synthesis of a Borylated Ibuprofen Derivative Through Suzuki Cross-Coupling and Alkene Boracarboxylation Reactions
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A boron-boron coupling reaction between two ethyl cation analogues.

Sebastian Litters1, Elisabeth Kaifer, Markus Enders

  • 1Institute of Inorganic Chemistry, Ruprecht-Karls-University Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany.

Nature Chemistry
|November 22, 2013
PubMed
Summary
This summary is machine-generated.

Researchers achieved a novel B-B coupling reaction between boron analogues of the ethyl cation. This synthesis yielded an unprecedented dicationic tetraborane, advancing boron chemistry and polymer design.

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Area of Science:

  • Synthetic Chemistry
  • Materials Science
  • Boron Chemistry

Background:

  • Bottom-up synthesis is crucial for constructing complex molecular architectures.
  • Element-element coupling reactions are key strategies for molecular assembly.
  • Boron chemistry offers unique bonding possibilities.

Purpose of the Study:

  • To explore novel B-B coupling reactions for synthesizing unique boron structures.
  • To investigate the formation and bonding properties of dicationic boron clusters.
  • To pave the way for boron-based polymers.

Main Methods:

  • Utilized a B-B coupling reaction between specific boron analogues.
  • Characterized the resulting dicationic tetraborane product.
  • Analyzed the bonding within the B₄ core.

Main Results:

  • Successfully synthesized an unprecedented dicationic tetraborane.
  • The B₄ core exhibits unique bonding with two B-B units and three-centre, two-electron bonds.
  • Demonstrated a new pathway for boron cluster synthesis.

Conclusions:

  • The B-B coupling reaction is a viable method for creating novel boron structures.
  • The discovered dicationic tetraborane has potential applications in materials science.
  • This work highlights the role of multi-centre bonding in chemical reactivity.