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Nanomaterials
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Nano Au Materials for Catalysis of Organic Transformations
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Nano Au Materials for Catalysis of Organic Transformations

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Energy and Catalysis".

Deadline for manuscript submissions: closed (31 July 2021) | Viewed by 12478

Special Issue Editor

Prof. Dr. Manolis Stratakis

E-Mail Website
Guest Editor
Department of Chemistry, University of Crete, 71003 Heraklion, Greece
Interests: heterogeneous catalysis of organic transformations using metal nanoparticles, synthetic organic methodology, green chemistry, biomimetic organic synthesis

Special Issue Information

Dear Colleagues,

Nano Au catalysts (supported or unsupported Au nanoparticles and nanoporous Au materials) have emerged rather unexpectedly as powerful heterogeneous and recyclable catalysts in a variety of organic transformations, initially in aerobic oxidative transformations, later to reductive processes by various means, with an emphasis on transfer hydrogenation, and more recently, in the activation of π systems and σ heteroelement linkages.

In this Special Issue on “Nano Au materials for Catalysis of Organic Transformations”, a series of original contributions by leading experts in the field is expected to highlight recent advances and future perspectives of this emerging topic. These original research and review articles are intended to cover various aspects in the field of nano Au science, including synthesis, structural characterization of catalysts, theoretical studies, and primarily, their catalytic applications in a diverse range of organic transformations.

Prof. Dr. Manolis Stratakis
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 submissions that pass pre-check are 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. Nanomaterials 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 2400 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

  • nano Au catalysts
  • Au nanoparticles
  • nanoporous Au materials
  • catalysts
  • theoretical studies
  • homogeneous catalysis
  • organic transformations/ reactions

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Published Papers (2 papers)

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Research

10 pages, 2439 KiB  
Article
Reduction of the Diazo Functionality of α-Diazocarbonyl Compounds into a Methylene Group by NH3BH3 or NaBH4 Catalyzed by Au Nanoparticles
by Marios Kidonakis and Manolis Stratakis
Nanomaterials 2021, 11(1), 248; https://doi.org/10.3390/nano11010248 - 18 Jan 2021
Cited by 3 | Viewed by 3098
Abstract
Supported Au nanoparticles on TiO2 (1 mol%) are capable of catalyzing the reduction of the carbene-like diazo functionality of α-diazocarbonyl compounds into a methylene group [C=(N2) → CH2] by NH3BH3 or NaBH4 in methanol [...] Read more.
Supported Au nanoparticles on TiO2 (1 mol%) are capable of catalyzing the reduction of the carbene-like diazo functionality of α-diazocarbonyl compounds into a methylene group [C=(N2) → CH2] by NH3BH3 or NaBH4 in methanol as solvent. The Au-catalyzed reduction that occurs within a few minutes at room temperature formally requires one hydride equivalent (B-H) and one proton that originates from the protic solvent. This pathway is in contrast to the Pt/CeO2-catalyzed reaction of α-diazocarbonyl compounds with NH3BH3 in methanol, which leads to the corresponding hydrazones instead. Under our stoichiometric Au-catalyzed reaction conditions, the ketone-type carbonyls remain intact, which is in contrast to the uncatalyzed conditions where they are selectively reduced by the boron hydride reagent. It is proposed that the transformation occurs via the formation of chemisorbed carbenes on Au nanoparticles, having proximally activated the boron hydride reagent. This protocol is the first general example of catalytic transfer hydrogenation of the carbene-like α -ketodiazo functionality. Full article
(This article belongs to the Special Issue Nano Au Materials for Catalysis of Organic Transformations)
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17 pages, 1942 KiB  
Article
Selective Synthesis of Benzimidazoles from o-Phenylenediamine and Aldehydes Promoted by Supported Gold Nanoparticles
by Marina A. Tzani, Catherine Gabriel and Ioannis N. Lykakis
Nanomaterials 2020, 10(12), 2405; https://doi.org/10.3390/nano10122405 - 1 Dec 2020
Cited by 50 | Viewed by 8580
Abstract
We investigated the catalytic efficacy of supported gold nanoparticles (AuNPs) towards the selective reaction between o-phenylenediamine and aldehydes that yields 2-substituted benzimidazoles. Among several supported gold nanoparticle platforms, the Au/TiO2 provides a series of 2-aryl and 2-alkyl substituted benzimidazoles at ambient [...] Read more.
We investigated the catalytic efficacy of supported gold nanoparticles (AuNPs) towards the selective reaction between o-phenylenediamine and aldehydes that yields 2-substituted benzimidazoles. Among several supported gold nanoparticle platforms, the Au/TiO2 provides a series of 2-aryl and 2-alkyl substituted benzimidazoles at ambient conditions, in the absence of additives and in high yields, using the mixture CHCl3:MeOH in ratio 3:1 as the reaction solvent. Among the AuNPs catalysts used herein, the Au/TiO2 containing small-size nanoparticles is found to be the most active towards the present catalytic methodology. The Au/TiO2 can be recovered and reused at least five times without a significant loss of its catalytic efficacy. The present catalytic synthetic protocol applies to a broad substrate scope and represents an efficient method for the formation of a C–N bond under mild reaction conditions. Notably, this catalytic methodology provides the regio-isomer of the anthelmintic drug, Thiabendazole, in a lab-scale showing its applicability in the efficient synthesis of such N-heterocyclic molecules at industrial levels. Full article
(This article belongs to the Special Issue Nano Au Materials for Catalysis of Organic Transformations)
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