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Molecules
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Recent Development on Metal-Free Catalysis
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Recent Development on Metal-Free Catalysis

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

Deadline for manuscript submissions: closed (30 June 2019) | Viewed by 26664

Special Issue Editors

Prof. Dr. Huixin He

E-Mail Website
Guest Editor
Rutgers Department of Chemistry, Rutgers—Newark, The State University of New Jersey, Newark, NJ 07103, USA
Interests: nanoscale chemistry; microwave chemistry; electrochemistry
Dr. Ning Ma

E-Mail Website
Guest Editor
Department of Chemistry, School of Science, Tianjin University, Tianjin, China
Interests: organocatalysis; green reactions; heterogeneous catalysis; cooperative catalysis; organic polymer
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Metal-free catalysis has emerged as important alternative to metal catalysis in the past few decades. Metals, especially some transition metals, are toxic, expensive, rare, and not eco-friendly, which also make them non-sustainable. Therefore, there are increasing needs for more green catalysts without metals. The utility of metal-free catalysts can partially overcome some drawbacks of metal catalysts. Furthermore, in some cases, metal-free catalysis has more advantages, such as unique performance, selectivity, recyclability and substrate tolerance.

In this Special Issue we welcome the submission about all scopes of metal-free catalysts, including but not restricted to carbon-based nanomaterials, small organic molecules, organic/inorganic polymers and other organic/inorganic nanomaterials. The utility of the catalysts includes organic/inorganic chemical reactions, photocatalysis, environmental reactions, etc. The reaction products could be either organics or inorganics. We are hoping your contribution to this issue, which we think will give comprehensive understanding on the metal-free catalysis for the readers interested in these domains.

Prof. Huixin He
Prof. Ning Ma
Guest Editors

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. 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 2700 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

  • metal-free catalysis
  • nanomaterials
  • heterogeneous catalysis
  • photocatalysis
  • environmental pollution control

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Published Papers (4 papers)

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Research

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14 pages, 2805 KiB  
Article
1,3-Dibromo-5,5-dimethylhydantoin as a Precatalyst for Activation of Carbonyl Functionality
by Klara Čebular, Bojan Đ. Božić and Stojan Stavber
Molecules 2019, 24(14), 2608; https://doi.org/10.3390/molecules24142608 - 17 Jul 2019
Cited by 9 | Viewed by 7725
Abstract
Activation of carbonyl moiety is one of the most rudimentary approaches in organic synthesis and is crucial for a plethora of industrial-scale condensation reactions. In esterification and aldol condensation, which represent two of the most important reactions, the susceptibility of the carbonyl group [...] Read more.
Activation of carbonyl moiety is one of the most rudimentary approaches in organic synthesis and is crucial for a plethora of industrial-scale condensation reactions. In esterification and aldol condensation, which represent two of the most important reactions, the susceptibility of the carbonyl group to nucleophile attack allows the construction of a variety of useful organic compounds. In this context, there is a constant need for development of and improvement in the methods for addition-elimination reactions via activation of carbonyl functionality. In this paper, an advanced methodology for the direct esterification of carboxylic acids and alcohols, and for aldol condensation of aldehydes using widely available, inexpensive, and metal-free 1,3-dibromo-5,5-dimethylhydantoin under neat reaction conditions is reported. The method is air- and moisture-tolerant, allowing simple synthetic and isolation procedures for both reactions presented in this paper. The reaction pathway for esterification is proposed and a scale-up of certain industrially important derivatives is performed. Full article
(This article belongs to the Special Issue Recent Development on Metal-Free Catalysis)
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12 pages, 1293 KiB  
Communication
Direct Transformation from Arylamines to Aryl Naphthalene-1,8-diamino Boronamides: A Metal-Free Sandmeyer-Type Process
by Siyi Ding, Qiang Ma, Min Zhu, Huaping Ren, Shaopeng Tian, Yuzhen Zhao and Zongcheng Miao
Molecules 2019, 24(3), 377; https://doi.org/10.3390/molecules24030377 - 22 Jan 2019
Cited by 7 | Viewed by 3658
Abstract
A direct metal-free transformation from arylamines to aryl naphthalene-1,8-diamino boronamides, a type of masked boronic acid, has been developed based on Sandmeyer-type reactions. A nonsymmetrical diboron reagent, B(pin)-B(dan), was utilized as the borylating reagent, and the B(dan) moiety was transferred to the aim [...] Read more.
A direct metal-free transformation from arylamines to aryl naphthalene-1,8-diamino boronamides, a type of masked boronic acid, has been developed based on Sandmeyer-type reactions. A nonsymmetrical diboron reagent, B(pin)-B(dan), was utilized as the borylating reagent, and the B(dan) moiety was transferred to the aim products selectively. This conversion tolerated a series of functional groups, including chloro, bromo, fluoro, ester, hydroxy, cyano and amide. Full article
(This article belongs to the Special Issue Recent Development on Metal-Free Catalysis)
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6 pages, 724 KiB  
Communication
Transition-Metal-Free C(sp3)–H Oxidation of Diarylmethanes
by Fan Yang, Bihui Zhou, Pu Chen, Dong Zou, Qiannan Luo, Wenzhe Ren, Linlin Li, Limei Fan and Jie Li
Molecules 2018, 23(8), 1922; https://doi.org/10.3390/molecules23081922 - 1 Aug 2018
Cited by 7 | Viewed by 3765
Abstract
An efficient direct C(sp3)–H oxidation of diarylmethanes has been demonstrated by this study. This method employs environment-friendly O2 as an oxidant and is promoted by commercially available MN(SiMe3)2 [M = K, Na or Li], which provides a facile method [...] Read more.
An efficient direct C(sp3)–H oxidation of diarylmethanes has been demonstrated by this study. This method employs environment-friendly O2 as an oxidant and is promoted by commercially available MN(SiMe3)2 [M = K, Na or Li], which provides a facile method for the synthesis of various diaryl ketones in excellent yields. This protocol is metal-free, mild and compatible with a number of functional groups on substrates. Full article
(This article belongs to the Special Issue Recent Development on Metal-Free Catalysis)
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Review

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30 pages, 9331 KiB  
Review
Tris(pentafluorophenyl)borane-Catalyzed Reactions Using Silanes
by Taylor Hackel and Nicholas A. McGrath
Molecules 2019, 24(3), 432; https://doi.org/10.3390/molecules24030432 - 25 Jan 2019
Cited by 44 | Viewed by 10214
Abstract
The utility of an electron-deficient, air stable, and commercially available Lewis acid tris(pentafluorophenyl)borane has recently been comprehensively explored. While being as reactive as its distant cousin boron trichloride, it has been shown to be much more stable and capable of catalyzing a variety [...] Read more.
The utility of an electron-deficient, air stable, and commercially available Lewis acid tris(pentafluorophenyl)borane has recently been comprehensively explored. While being as reactive as its distant cousin boron trichloride, it has been shown to be much more stable and capable of catalyzing a variety of powerful transformations, even in the presence of water. The focus of this review will be to highlight those catalytic reactions that utilize a silane as a stoichiometric reductant in conjunction with tris(pentafluorophenyl) borane in the reduction of alcohols, carbonyls, or carbonyl-like derivatives. Full article
(This article belongs to the Special Issue Recent Development on Metal-Free Catalysis)
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