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Related Concept Videos

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.
Electrolysis03:00

Electrolysis

In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
Enolate Mechanism Conventions01:15

Enolate Mechanism Conventions

When a carbonyl compound is treated with a strong base, the α position gets deprotonated to give a resonance-stabilized intermediate called an enolate. Enolates are ambident nucleophiles because they possess two nucleophilic sites that can attack an electrophile owing to the delocalization of the negative charge between the α carbon and oxygen atoms. When the oxygen atom attacks an electrophile, it is called O-attack, whereas electrophilic attack via the α carbon is known as C-attack.
C-attack...
Reactions of Aldehydes and Ketones: Baeyer–Villiger Oxidation01:22

Reactions of Aldehydes and Ketones: Baeyer–Villiger Oxidation

Baeyer–Villiger oxidation converts aldehydes to carboxylic acids and ketones to esters. The reaction uses peroxy acids or peracids and is often catalyzed by acid. The reaction is named after its pioneers, Adolf von Baeyer and Victor Villiger. The reaction is achieved by a wide range of peracids such as m-chloroperoxybenzoic acid (mCPBA), perbenzoic acid (C6H5COOOH), peracetic acid (CH3COOOH), hydrogen peroxide (H2O2), and tert-butyl hydroperoxide (t-BuOOH).
The carbonyl center is activated by...
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.
Reactivity of Enolate Ions01:23

Reactivity of Enolate Ions

Enolate ions are formed by the acid–base reaction of a carbonyl compound with a base. This leads to deprotonation of the α hydrogen atom, leading to a resonance-stabilized enolate ion where one of the contributing structures is an oxyanion, which imparts additional stability. Therefore, the proton on the α carbon is more acidic in nature than that of other sp3-hybridized C–H bonds but less acidic than those in O–H bonds where the negative charge in the conjugate base is localized on the oxygen...

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Catechol boronate formation and its electrochemical oxidation.

Lu Zhang1, Justin A Kerszulis, Ronald J Clark

  • 1Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL 32306-4390, USA.

Chemical Communications (Cambridge, England)
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Researchers studied the reversible boronate formation between substituted catechols and fluorescent boronic acid in methanol. This reaction is key for developing new electrochemical sensors.

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Area of Science:

  • Electrochemistry
  • Organic Chemistry
  • Materials Science

Background:

  • Boronate esters are important functional groups in organic synthesis and materials science.
  • Catechol derivatives are known for their redox activity and ability to coordinate with boron compounds.
  • Fluorescent boronic acids offer a sensitive detection mechanism for boronate formation.

Purpose of the Study:

  • To investigate the mechanism and kinetics of reversible boronate formation.
  • To explore the use of electrochemically active catechols in conjunction with fluorescent boronic acids.
  • To establish a foundation for developing novel fluorescent electrochemical sensors.

Main Methods:

  • Electrochemical techniques were employed to study the redox properties of substituted catechols.
  • Spectroscopic methods (e.g., fluorescence spectroscopy) were used to monitor boronate formation.
  • Reaction kinetics were analyzed in methanol solvent system.

Main Results:

  • The study successfully demonstrated the reversible boronate formation between the studied compounds.
  • The electrochemical activity of the catechols was found to influence the boronate formation process.
  • Changes in fluorescence intensity correlated with the extent of boronate ester formation.

Conclusions:

  • Reversible boronate formation can be effectively modulated by electrochemically active catechols.
  • This work provides a basis for designing fluorescent and electrochemical sensing platforms.
  • The findings highlight the potential of integrating redox-active moieties with fluorescent reporters for chemical sensing applications.