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Related Concept Videos

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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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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Preparation of Hydrophobic Metal-Organic Frameworks via Plasma Enhanced Chemical Vapor Deposition of Perfluoroalkanes for the Removal of Ammonia
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Carbon Layer Formation on Hexagonal Boron Nitride by Plasma Processing in Hydroquinone Aqueous Solution.

Kenichi Inoue1,2, Noritaka Sakakibara1,2, Taku Goto1,2

  • 1Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba277-8561, Japan.

ACS Applied Materials & Interfaces
|November 18, 2022
PubMed
Summary

Plasma processing creates a functional carbon layer on hexagonal boron nitride (hBN) particles. This surface modification enhances dispersibility and allows for further chemical functionalization in composite materials.

Keywords:
carbon coatingfunctionalizationhexagonal boron nitrideplasma in solutionsurface modification

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Hexagonal boron nitride (hBN) is a valuable filler for composites due to its thermal conductivity and electrical insulation.
  • Surface modification of hBN is challenging, hindering its integration and functionalization in advanced materials.

Purpose of the Study:

  • To investigate carbon layer formation on hBN via plasma processing in hydroquinone solution.
  • To explore this method for enhancing hBN dispersibility and enabling further functionalization.

Main Methods:

  • Plasma processing of hBN particles in hydroquinone aqueous solution.
  • Characterization of the modified surface using electron spin resonance (ESR).
  • Functionalization of the modified hBN with isocyanate groups.

Main Results:

  • Uniform deposition of a hydrogenated amorphous carbon layer on hBN particles (HQpBN).
  • ESR revealed defects on hBN and dangling bonds in the carbon layer, indicating reactive sites.
  • Successful functionalization of HQpBN with isocyanate groups confirmed the method's efficacy.

Conclusions:

  • Plasma-induced carbon layer formation is an effective surface modification technique for hBN.
  • The carbon layer provides a designable interface for organic/inorganic composites.
  • This approach overcomes limitations in hBN dispersibility and functionalization for advanced material applications.