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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.
Electrophilic Aromatic Substitution: Chlorination and Bromination of Benzene01:15

Electrophilic Aromatic Substitution: Chlorination and Bromination of Benzene

Chlorination and bromination are important classes of electrophilic aromatic substitutions, where benzene reacts with chlorine or bromine in the presence of a Lewis acid catalyst to give halogenated substitution products. A Lewis acid such as aluminium chloride or ferric chloride catalyzes the chlorination, and ferric bromide catalyzes the bromination reactions. During the bromination of alkenes, bromine polarizes and becomes electrophilic. However, in the bromination of benzene, the bromine...
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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.
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.
Hybridization of Atomic Orbitals I03:24

Hybridization of Atomic Orbitals I

The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...

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Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents
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Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents

Published on: May 28, 2014

Platinum substituted boroles.

Holger Braunschweig1, Ching-Wen Chiu, Krzysztof Radacki

  • 1Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany. h.braunschweig@mail.uni-wuerzburg.de

Chemical Communications (Cambridge, England)
|January 29, 2010
PubMed
Summary
This summary is machine-generated.

Researchers synthesized novel 1-metalloboroles and their cationic derivatives. Adjusting the electronic properties of the metal complex attached to boron significantly altered the lowest electronic transition energy in these unique compounds.

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Area of Science:

  • Organometallic Chemistry
  • Boron Chemistry
  • Coordination Chemistry

Background:

  • 1-Metalloboroles represent a unique class of organometallic compounds with potential applications in catalysis and materials science.
  • Understanding the electronic properties and reactivity of metalloboroles is crucial for designing new functional molecules.

Purpose of the Study:

  • To synthesize and structurally characterize unprecedented 1-metalloborole complexes.
  • To investigate the effect of electronic tuning on the properties of 1-metalloboroles.

Main Methods:

  • Synthesis of 1-metalloborole [(Cy(3)P)(2)Pt(Cl)(BC(4)Ph(4))] (1) and its cationic derivative (2).
  • Structural characterization using X-ray diffraction and spectroscopic techniques.
  • Computational studies to analyze electronic properties.

Main Results:

  • Successful preparation and full structural elucidation of the novel 1-metalloborole (1) and its T-shaped cationic derivative (2).
  • Demonstrated that fine-tuning the electronics of the boron-bound metal complex significantly impacts the lowest electronic transition energy.
  • Observed distinct electronic transitions influenced by the coordination environment around the metal center.

Conclusions:

  • The study presents the first synthesis and characterization of a platinum-containing 1-metalloborole.
  • Electronic modifications of the metal center provide a powerful strategy to control the photophysical properties of 1-metalloboroles.
  • These findings open avenues for the development of new boron-based organometallic materials with tunable electronic characteristics.