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Related Concept Videos

Regioselectivity and Stereochemistry of Hydroboration02:36

Regioselectivity and Stereochemistry of Hydroboration

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.
Hydroboration-Oxidation of Alkenes03:08

Hydroboration-Oxidation of Alkenes

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.
Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation02:47

Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation

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.
Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...

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Synthesis of a Borylated Ibuprofen Derivative Through Suzuki Cross-Coupling and Alkene Boracarboxylation Reactions
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Recent progress in actinide borate chemistry.

Shuao Wang1, Evgeny V Alekseev, Wulf Depmeier

  • 1Department of Civil Engineering and Geological Sciences, University of Notre Dame, 156 Fitzpatrick Hall, Notre Dame, Indiana 46556, USA.

Chemical Communications (Cambridge, England)
|September 15, 2011
PubMed
Summary
This summary is machine-generated.

Researchers synthesized novel actinide borates using molten boric acid, revealing unique structures and properties. This advancement aids in understanding transuranium materials and developing safer nuclear waste forms.

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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Nuclear Chemistry

Background:

  • Molten boric acid is a novel reactive flux for synthesizing actinide borates.
  • This method provides access to exotic materials with unusual structures and properties.

Purpose of the Study:

  • To develop structure-property relationships in transuranium materials.
  • To explore the potential of actinide borates as advanced waste forms for nuclear waste.

Main Methods:

  • Synthesis of actinide borates using molten boric acid as a reactive flux.
  • Characterization of the structural and chemical properties of the synthesized compounds.

Main Results:

  • Thorium borates exhibit cationic supertetrahedral structures with high selectivity for TcO(4)(-).
  • Uranyl borates form noncentrosymmetric structures with rich topological relationships.
  • Neptunium borates display mixed-valence states, and plutonium borates show new coordination chemistry.
  • Americium borates represent a departure from plutonium borates, extending studies to later actinides.

Conclusions:

  • The synthesis of diverse actinide borates advances the understanding of transuranium materials chemistry.
  • These findings contribute to developing advanced waste forms for nuclear waste, potentially identifying solubility-limiting phases and stability characteristics.