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Special Issue "Photocatalytic Strategies in Organic Synthesis"

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Photochemistry".

Deadline for manuscript submissions: 31 December 2019

Special Issue Editor

Guest Editor
Dr. Davide Ravelli

PhotoGreen Lab, Department of Chemistry, University of Pavia Viale Taramelli 12, 27100 Pavia, Italy
Website | E-Mail
Interests: photocatalysis; green chemistry; radicals; organic synthesis; flow chemistry

Special Issue Information

Dear Colleagues,

It is difficult to exaggerate the importance that photocatalytic strategies have earned in recent years. Thanks to the unconventional pathways offered, they enable the smooth activation of substrates that would otherwise require harsh conditions to react, giving, at the same time, the desired products in excellent yields. Accordingly, photocatalytic processes are often considered as a superior choice when looking for an intrinsically green approach in the frame of organic synthesis. Indeed, recent trends involve the use of coloured catalysts, able to promote the desired processes under visible light irradiation or natural sunlight, further demonstrating the green potential of photocatalysis.

The seminal works by the groups of MacMillan, Yoon and Stephenson were published almost ten years ago now, igniting what can be considered an impressive “gold rush” of photocatalysis. This Special Issue wants to resume how far we have gone in this period and which future directions photocatalysis practitioners will move in.

Dr. Davide Ravelli
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Molecules is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Photocatalysis
  • Photoredox catalysis
  • Photoinduced electron transfer
  • Hydrogen atom transfer
  • Organic synthesis
  • Green synthesis
  • Visible light
  • Solar light

Published Papers (2 papers)

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Research

Open AccessFeature PaperArticle
Photocatalytic Atom Transfer Radical Addition to Olefins Utilizing Novel Photocatalysts
Molecules 2019, 24(9), 1644; https://doi.org/10.3390/molecules24091644
Received: 16 March 2019 / Revised: 22 April 2019 / Accepted: 25 April 2019 / Published: 26 April 2019
PDF Full-text (3172 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
Photocatalysis is a rapidly evolving area of research in modern organic synthesis. Among the traditional photocatalysts, metal-complexes based on ruthenium or iridium are the most common. Herein, we present the synthesis of two photoactive, ruthenium-based complexes bearing pyridine-quinoline or terpyridine ligands with extended [...] Read more.
Photocatalysis is a rapidly evolving area of research in modern organic synthesis. Among the traditional photocatalysts, metal-complexes based on ruthenium or iridium are the most common. Herein, we present the synthesis of two photoactive, ruthenium-based complexes bearing pyridine-quinoline or terpyridine ligands with extended aromatic conjugation. Our complexes were utilized in the atom transfer radical addition (ATRA) of haloalkanes to olefins, using bromoacetonitrile or bromotrichloromethane as the source of the alkyl group. The tailor-made ruthenium-based catalyst bearing the pyridine-quinoline bidentate ligand proved to be the best-performing photocatalyst, among a range of metal complexes and organocatalysts, efficiently catalyzing both reactions. These photocatalytic atom transfer protocols can be expanded into a broad scope of olefins. In both protocols, the photocatalytic reactions led to products in good to excellent isolated yields. Full article
(This article belongs to the Special Issue Photocatalytic Strategies in Organic Synthesis)
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Open AccessArticle
Acid Catalyzed Formation of C–C and C–S Bonds via Excited State Proton Transfer
Molecules 2019, 24(7), 1318; https://doi.org/10.3390/molecules24071318
Received: 11 February 2019 / Revised: 28 March 2019 / Accepted: 28 March 2019 / Published: 3 April 2019
PDF Full-text (895 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
The behavior of 2-naphthol and 7-bromo-2-naphthol as organic photoacids are exploited in organic synthesis for the preparation of benzyl sulfides (using a trichloroacetimidate derivative as the starting substrate) and polycyclic amines via acid catalyzed condensation of 1,2,3,4-tetrahydroisoquinoline with aldehydes. Full article
(This article belongs to the Special Issue Photocatalytic Strategies in Organic Synthesis)
Figures

Graphical abstract

Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Type: Communication
Title: Precursors-Dependent Photocatalytic Activity of Carbon Dots
Authors: Simone Cailotto, Lorenzo Branzi, Alvise Benedetti, Davide Ravelli, Maurizio Selva, Alvise Perosa and Emanuele Amadio*
Abstract: This paper describes the photo-reduction of methyl viologen (MV2+) with graphitic or amorphous Carbon Dots (CDs) bottom-up prepared from fructose, glucose and citric acid. Morphologies, optical and photoredox features of CDs are affected by synthetic method employed as well as by carbon source. While hydrothermal treatment yielded amorphous CDs, pyrolysis afforded graphitic-like nano-structures. In MV2+-reduction, citric acid-CDs resulted the most performant. Interestingly, while graphitization of glucose- and citric acid-CDs favoured the photo-reaction, a reverse dependence was observed with the fructose-CDs. These results provide more clarity on the structure−activity relationship by demonstrating the key role of the carbon source.

 

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