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Related Concept Videos

Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

2.9K
Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
2.9K
Preparation and Reactions of Thiols02:33

Preparation and Reactions of Thiols

8.1K
Thiols are prepared using the hydrosulfide anion as a nucleophile in a nucleophilic substitution reaction with alkyl halides. For instance, bromobutane reacts with sodium hydrosulfide to give butanethiol.
8.1K
Sharpless Epoxidation02:57

Sharpless Epoxidation

5.5K
The conversion of allylic alcohols into epoxides using the chiral catalyst was discovered by K. Barry Sharpless and is known as Sharpless epoxidation. The use of a chiral catalyst enables the formation of one enantiomer of the product in excess. This chiral catalyst is mainly a chiral complex of titanium tetraisopropoxide and tartrate ester (specific stereoisomer). The stereoisomer used in the chiral catalyst dictates the formation of the enantiomer of the product. In other words, the use of...
5.5K
Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction01:22

Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction

2.4K
The radical dimerization of ketones or aldehydes gives vicinal diols through a pinacol coupling reaction. However, the behavior of titanium metals used for the reaction as a source of electrons is unusual. When the reaction is carried out in the presence of titanium, diols can be isolated at low temperatures. Else titanium further reacts with diols, forming alkenes through the McMurry reaction.
2.4K
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

13.8K
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.
13.8K
Photoluminescence: Applications01:14

Photoluminescence: Applications

1.3K
Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
1.3K

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Updated: Apr 17, 2026

Photopatterning Proteins and Cells in Aqueous Environment Using TiO2 Photocatalysis
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Photopatterning Proteins and Cells in Aqueous Environment Using TiO2 Photocatalysis

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Visible light promoted thiol-ene reactions using titanium dioxide.

Venugopal T Bhat1, Petar A Duspara, Sangwon Seo

  • 1School of Chemistry, University of Manchester, Oxford Rd, Manchester, M13 9PL, UK. michaelgreaney@manchester.ac.uk.

Chemical Communications (Cambridge, England)
|February 14, 2015
PubMed
Summary
This summary is machine-generated.

This study demonstrates the efficient radical addition of thiols to alkenes using visible light photocatalysis. Titanium dioxide (TiO2) serves as a cost-effective photocatalyst for this important chemical transformation.

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Area of Science:

  • Organic Chemistry
  • Photochemistry
  • Materials Science

Background:

  • Radical addition reactions are fundamental in organic synthesis.
  • Developing sustainable and efficient catalytic methods is crucial.
  • Photoredox catalysis offers a green alternative for radical generation.

Purpose of the Study:

  • To report a novel photoredox-catalyzed method for thiol-alkene radical addition.
  • To utilize visible light and a cost-effective photocatalyst.
  • To establish an efficient and accessible synthetic route.

Main Methods:

  • Employing visible light irradiation.
  • Utilizing titanium dioxide (TiO2) as a photocatalyst.
  • Investigating the radical addition of various thiols to alkenes.

Main Results:

  • Successful radical addition of thiols to alkenes was achieved.
  • Visible light and TiO2 proved effective under mild conditions.
  • The method offers a sustainable approach to C-S bond formation.

Conclusions:

  • Photoredox catalysis with TiO2 is a viable method for thiol-alkene addition.
  • This approach provides an economical and environmentally friendly synthetic strategy.
  • The findings contribute to the advancement of sustainable organic synthesis.