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Related Concept Videos

Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

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The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para...
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Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate02:21

Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate

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Alkenes can be dihydroxylated using potassium permanganate.  The method encompasses the reaction of an alkene with a cold, dilute solution of potassium permanganate under basic conditions to form a cis-diol along with a brown precipitate of manganese dioxide.
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Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

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Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
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Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids02:04

Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids

7.1K
Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.
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Oxidation of Alcohols02:37

Oxidation of Alcohols

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In this lesson, the oxidation of alcohols is discussed in depth. The various reagents used for oxidation of primary and secondary alcohols are detailed, and their mechanism of action is provided.
The process of oxidation in a chemical reaction is observed in any of the three forms:
15.5K
Colors and Magnetism03:02

Colors and Magnetism

13.7K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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Related Experiment Video

Updated: Jan 3, 2026

Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions
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Decolorization of structurally different synthetic dyes using cobalt(II)/ascorbic acid/hydrogen peroxide system.

Pradeep Verma1, Petr Baldrian, Frantisek Nerud

  • 1Laboratory of Biochemistry of the Wood-rotting Fungi, Institute of Microbiology ASCR, Vídenská 1083, 142 20 Prague, Czech Republic.

Chemosphere
|January 18, 2003
PubMed
Summary

The cobalt(II)/ascorbic acid/hydrogen peroxide system rapidly decolorizes various dyes by producing hydroxyl radicals. This efficient method works across a wide pH range and is faster than using other transition metals.

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Area of Science:

  • Environmental Chemistry
  • Green Chemistry
  • Catalysis

Background:

  • Azo, acridine, anthraquinone, thiazine, and triphenylmethane dyes are common industrial pollutants.
  • Effective decolorization methods are crucial for wastewater treatment.
  • Transition metal-catalyzed oxidation is a promising approach for dye degradation.

Purpose of the Study:

  • To investigate the efficacy of the cobalt(II)/ascorbic acid/hydrogen peroxide system for decolorizing various dye classes.
  • To compare the efficiency of cobalt with other transition metals in this decolorization system.
  • To determine the optimal reaction conditions, including pH and reaction time.

Main Methods:

  • Utilizing a cobalt(II)/ascorbic acid/hydrogen peroxide catalytic system.
  • Testing the system's effectiveness on azo, acridine, anthraquinone, thiazine, and triphenylmethane dyes.
  • Evaluating the influence of pH and comparing cobalt with copper as catalysts.

Main Results:

  • Over 90% decolorization achieved for most dyes within 15 minutes.
  • Remazol Brilliant Blue R showed 75% decolorization.
  • The system's efficiency was pH-independent between pH 3-9.
  • Cobalt catalyst was more efficient than copper, requiring less time and concentration.

Conclusions:

  • The cobalt(II)/ascorbic acid/hydrogen peroxide system is a highly efficient and rapid method for decolorizing a wide range of industrial dyes.
  • Hydroxyl radicals generated by the system are the primary agents responsible for dye degradation.
  • This catalytic system offers a potentially greener and more effective alternative for dye wastewater treatment compared to other transition metals.