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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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Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation02:47

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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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Regioselectivity and Stereochemistry of Hydroboration02:36

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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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One-Shot Multiple Borylation toward BN-Doped Nanographenes.

Kohei Matsui1, Susumu Oda1, Kazuki Yoshiura1

  • 1Department of Chemistry, School of Science and Technology, Kwansei Gakuin University , 2-1 Gakuen, Sanda, Hyogo 669-1337, Japan.

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|November 10, 2017
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Researchers developed efficient borylation reactions for triarylamines, enabling the synthesis of novel boron- and nitrogen-doped nanographenes. These materials achieved deep blue emission in organic light-emitting diodes, showcasing their potential for advanced display technologies.

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Triarylamines are versatile organic compounds.
  • Developing efficient synthetic routes to functionalized nanographenes is crucial for advanced materials.
  • Boron- and nitrogen-doped nanographenes offer unique electronic and optical properties.

Purpose of the Study:

  • To develop novel one-shot borylation reactions for triarylamines.
  • To synthesize diverse boron- and nitrogen-doped nanographenes (BN-nanographenes).
  • To evaluate the performance of BN-nanographenes in organic light-emitting diode (OLED) devices.

Main Methods:

  • Development of one-shot double, triple, and quadruple borylation reactions using specific boron sources and Brønsted bases.
  • Two-step synthesis of BN-nanographenes from commercially available triarylamines.
  • Fabrication and characterization of OLED devices utilizing synthesized BN-nanographenes as emitters.

Main Results:

  • Successful development of efficient one-shot borylation reactions for triarylamines.
  • Synthesis of a variety of BN-doped nanographenes in a facile two-step process.
  • An OLED device with a BN-nanographene emitter demonstrated deep pure-blue emission (460 nm) with high external quantum efficiency (18.3%).

Conclusions:

  • The developed borylation reactions provide a versatile route to functionalized triarylamines.
  • BN-doped nanographenes can be efficiently synthesized for optoelectronic applications.
  • The synthesized BN-nanographenes are promising materials for high-performance deep-blue OLEDs.