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Contemporary Organosilicon Chemistry
Contemporary organosilicon chemistry Edited by Steve Marsden Generated on 05 October 2021, 02:13 Imprint Beilstein Journal of Organic Chemistry www.bjoc.org ISSN 1860-5397 Email: [email protected] The Beilstein Journal of Organic Chemistry is published by the Beilstein-Institut zur Förderung der Chemischen Wissenschaften. This thematic issue, published in the Beilstein Beilstein-Institut zur Förderung der Journal of Organic Chemistry, is copyright the Chemischen Wissenschaften Beilstein-Institut zur Förderung der Chemischen Trakehner Straße 7–9 Wissenschaften. The copyright of the individual 60487 Frankfurt am Main articles in this document is the property of their Germany respective authors, subject to a Creative www.beilstein-institut.de Commons Attribution (CC-BY) license. Contemporary organosilicon chemistry Steve Marsden Editorial Open Access Address: Beilstein Journal of Organic Chemistry 2007, 3, No. 4. School of Chemistry, University of Leeds, Leeds LS2 9JT, UK doi:10.1186/1860-5397-3-4 Email: Received: 06 February 2007 Steve Marsden - [email protected] Accepted: 08 February 2007 Published: 08 February 2007 © 2007 Marsden; licensee Beilstein-Institut License and terms: see end of document. Abstract Editorial for the Thematic Series on Contemporary Organosilicon Chemistry. The field of organosilicon chemistry has a rich and varied the 1990s, and equivalent to the number appearing in the much history, and has long since made the progression from chemical longer established field of organoboron chemistry -
Herbert Charles Brown, a Biographical Memoir
NATIONAL ACADEMY OF SCIENCES H E R B E R T Ch ARLES BROWN 1 9 1 2 — 2 0 0 4 A Biographical Memoir by E I-I CH I N EGIS HI Any opinions expressed in this memoir are those of the author and do not necessarily reflect the views of the National Academy of Sciences. Biographical Memoir COPYRIGHT 2008 NATIONAL ACADEMY OF SCIENCES WASHINGTON, D.C. Photograph Credit Here. HERBERT CHARLES BROWN May 22, 1912–December 19, 2004 BY EI -ICH I NEGISHI ERBERT CHARLES BROWN, R. B. Wetherill Research Profes- Hsor Emeritus of Purdue University and one of the truly pioneering giants in the field of organic-organometallic chemistry, died of a heart attack on December 19, 2004, at age 92. As it so happened, this author visited him at his home to discuss with him an urgent chemistry-related matter only about 10 hours before his death. For his age he appeared well, showing no sign of his sudden death the next morn- ing. His wife, Sarah Baylen Brown, 89, followed him on May 29, 2005. They were survived by their only child, Charles A. Brown of Hitachi Ltd. and his family. H. C. Brown shared the Nobel Prize in Chemistry in 1979 with G. Wittig of Heidelberg, Germany. Their pioneering explorations of boron chemistry and phosphorus chemistry, respectively, were recognized. Aside from several biochemists, including V. du Vigneaud in 1955, H. C. Brown was only the second American organic chemist to win a Nobel Prize behind R. B. Woodward, in 1965. His several most significant contribu- tions in the area of boron chemistry include (1) codiscovery of sodium borohyride (1972[1], pp. -
Sonochemical and Sonoelectrochemical Production of Hydrogen-An Overview 2 Md Hujjatul Islam, Odne S
1 1 Sonochemical and Sonoelectrochemical Production of Hydrogen-An Overview 2 Md Hujjatul Islam, Odne S. Burheim and Bruno G. Pollet* 3 4 Department of Energy and Process Engineering, 5 Faculty of Engineering, 6 Norwegian University of Science and Technology (NTNU), 7 NO-7491 Trondheim, Norway 8 *[email protected] 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 2 36 Abstract 37 38 Reserves of fossil fuel such as coal, oil and natural gas on earth are finite. Also, the continuous use 39 and burning of these fossil resources in industrial, domestic and transport sectors results in the 40 extremely high emission of greenhouse gases into the atmosphere. Therefore, it is necessary to 41 explore pollution free and more efficient energy sources in order to replace depleting fossil fuels. 42 The use of hydrogen as an alternative fuel source is particularly attractive due to its very high 43 specific energy compared to other conventional fuels. Hydrogen can be produced through various 44 process technologies such as thermal, electrolytic and photolytic processes. Thermal processes 45 include gas reforming, renewable liquid and biooil processing, biomass and coal gasification; 46 however, these processes release a huge amount of greenhouse gases. Production of hydrogen from 47 water using ultrasound could be a promising technique to produce clean hydrogen. Also, using 48 ultrasound in water electrolysis could be a promising method to produce hydrogen where 49 ultrasound enhances electrolytic process in several ways such as enhanced mass transfer, removal 50 of bubbles and activation of the electrode surface. -
MICROREVIEW Reactivity of Polar Organometallic Compounds In
MICROREVIEW Reactivity of Polar Organometallic Compounds in Unconventional Reaction Media: Challenges and Opportunities Joaquin García-Álvarez,*[a] Eva Hevia,*[b] and Vito Capriati*[c] This paper is gratefully dedicated to the memory of Dr. Guy Lavigne Abstract: Developing new green solvents in designing chemical chemicals in chemical transformations is, indeed, solvents used products and processes or successfully employing the already as reaction media, which account for 80–90% of mass utilization existing ones is one of the key subjects in Green Chemistry and is in a typical pharmaceutical/fine chemical operational process. especially important in Organometallic Chemistry, which is an Thus, the solvent itself is often a critical parameter especially in interdisciplinary field. Can we advantageously use unconventional drug product manufacturing and is as well responsible for most reaction media in place of current harsh organic solvents also for waste generated in the chemical industries and laboratories.[3] polar organometallic compounds? This Microreview critically Following these considerations, some of the most critical analyses the state-of-the-art on this topic and showcases recent and intriguing questions that arise are: Can we get traditional developments and breakthroughs which are becoming new research organic solvents out of organometallic reactions?[4] Can we use directions in this field. Because metals cover a vast swath of the protic, recyclable, biodegradable, and cheap unconventional periodic table, the content is organised into three Sections solvents also for highly reactive organometallic compounds? discussing the reactivity of organometallic compounds of s-, p- and Answering these questions would not only mean to break new d-block elements in unconventional solvents. -
Ultrasound in Electrochemical Degradation of Pollutants
Chapter 10 Ultrasound in Electrochemical Degradation of Pollutants Gustavo Stoppa Garbellini Additional information is available at the end of the chapter http://dx.doi.org/10.5772/47755 1. Introduction The increase of industrial activities and intensive use of chemical substances such as petroleum oil, polycyclic aromatic hydrocarbons, BTEX (benzene, toluene, ethylbenzene and xylenes), chlorinated hydrocarbons as polychlorinated biphenyls, trichloroethylene and perchloroethylene, pesticides, dyes, dioxines and heavy metals have been contributing to environmental pollution with dramatic consequences in atmosphere, waters and soils (Martínez-Huitle & Ferro, 2006; Megharaj et al., 2011). Electrochemical technologies have been extensively used for degradation of toxic compounds since these technologies present some advantages, among them: versatility, environmental compatibility and potential cost effectiveness (Martínez-Huitle & Ferro, 2006; Chen, 2004; Ghernaout et al., 2011; Panizza & Cerisola, 2009). However, a loss in the efficiency of such degradation processes is observed due to the adsorption and/or insolubilization of the oxidation and/or reduction products on the electrodes surfaces (Garbellini et al., 2010; Lima Leite et al., 2002). In this sense, power ultrasound has been employed to overcome such electrode fouling problem (passivation) due to the ultrasound ability for cleaning the electrode surface, called sonoelectrochemistry (Compton et al., 1997). The production of ultrasound is a physical phenomenon based on the process of creating, growing and imploding cavities of steam and gases, known as cavitation. During the compression step, the pressure is positive, while the expansion results in vacuum called negative pressure formed in a compression-expansion cycle that generates cavities (Mason, 1990; Martines et al., 2000). In chemistry, ultrasound has been used in organic synthesis, polymerization, sonolysis, preparation of catalysts and sonoelectrosynthesis (Mason, 1990; Martines et al., 2000). -
The Synthesis and Thermochemistry of Organoboron and Phosphorus
The Synthesis and Thermochemistry of Organoboron and Phosphorus Compounds A Thesis submitted by KHAWAJA SABIR HÜ3SAIR in candidature for the degree of Doctor of Philosophy of the University of London Royal Holloway College, Englefleld Green, Surrey. March, 1970. (U.K.;. CLASS N l / V u j AGO. No. I DA ft ACa â u L j j L À ProQuest Number: 10123886 All rights reserved INFORMATION TO ALL USERS The quality of this reproduction is dependent upon the quality of the copy submitted. In the unlikely event that the author did not send a complete manuscript and there are missing pages, these will be noted. Also, if material had to be removed, a note will indicate the deletion. uest. ProQuest 10123886 Published by ProQuest LLC(2016). Copyright of the Dissertation is held by the Author. All rights reserved. This work is protected against unauthorized copying under Title 17, United States Code. Microform Edition © ProQuest LLC. ProQuest LLC 789 East Eisenhower Parkway P.O. Box 1346 Ann Arbor, Ml 48106-1346 "To all those who wished me to reach this stage" AOKNOlVLEDGmmTS The author wishes to express his gratitude to Dr# Arthur Finch for his Invaluable official supervision and encouragement. He Is highly thankful to Dr. P.J. Gardner for his entire supervision, unfailing encouragement and friendly advice. He Is also thankful to all the academic, technical and clerical staff, of the Chemistry Department, Royal Holloway College, for their co-operation and assistance. He wishes to thank the Petroleum Research Fund for a maintenance grant. ABSTRACT The synthesis and standard heats of formation of some substituted arylboroxlnes are reported. -
Présentation Powerpoint
R-M R-R’ R’-X Cross-Coupling Reactions R-M Functionnalized Organometallic Reagents R-X-R’ R-X-M C-N, C-O and C-S Bond Formation R-B(R’)2 Introduction to Organoboron Chemistry R-Si(R’)3 Introduction to Organosilicon Chemistry Carbometallation Reactions R-M R-R’ R’-X Introduction to Organosilicon Chemistry Generalities R-M Synthesis of Organosilicon Compounds R-X-R’ Hydrosilylation of Unsaturated Systems R-X-M Hiyama Cross-Coupling Hosomi-Sakurai Allylations R-B(R’)2 Brook Rearrangement R-Si(R’)3 Anion-Relay Chemistry (ARC) R-M R-R’ Introduction to Organosilicon Chemistry R’-X Generalities R-M Electronegativity s-Bond strengths (kcal.mol-1) Average Bond Length (Å) Si 1,7 C-C 83 R-X-R’ C-Si 76 C-C 1,54 Si-Si 53 C-Si 1,87 R-X-M H 2,1 C-H 83 C 2,5 Si-H 76 C-O 1,43 R-B(R’)2 Si-O 1,66 Cl 3,0 C-O 86 Si-O 108 N 3,0 R-Si(R’)3 C-N 83 O 3,5 Si-N 76 C-F 116 F 4,0 Si-F 135 R-M R-R’ Introduction to Organosilicon Chemistry R’-X Generalities R-M Electronegativity s-Bond strengths (kcal.mol-1) Average Bond Length (Å) Si 1,7 C-C 83 R-X-R’ C-Si 76 C-C 1,54 Si-Si 53 C-Si 1,87 R-X-M H 2,1 C-H 83 C 2,5 Si-H 76 C-O 1,43 R-B(R’)2 Si-O 1,66 Cl 3,0 C-O 86 Si-O 108 N 3,0 R-Si(R’)3 C-N 83 O 3,5 Si-N 76 C-F 116 F 4,0 Si-F 135 R-M R-R’ Introduction to Organosilicon Chemistry R’-X Generalities R-M Electronegativity s-Bond strengths (kcal.mol-1) Average Bond Length (Å) Si 1,7 C-C 83 R-X-R’ C-Si 76 C-C 1,54 Si-Si 53 C-Si 1,87 R-X-M H 2,1 C-H 83 C 2,5 Si-H 76 C-O 1,43 R-B(R’)2 Si-O 1,66 Cl 3,0 C-O 86 Si-O 108 N 3,0 R-Si(R’)3 C-N 83 O 3,5 Si-N 76 C-F 116 F 4,0 Si-F 135 R-M -
Divalent Nonaqueous Metal-Air Batteries
REVIEW published: 12 February 2021 doi: 10.3389/fenrg.2020.602918 Divalent Nonaqueous Metal-Air Batteries Yi-Ting Lu 1,2, Alex R. Neale 1, Chi-Chang Hu 2 and Laurence J. Hardwick 1* 1Department of Chemistry, Stephenson Institute for Renewable Energy, University of Liverpool, Liverpool, United Kingtom, 2Department of Chemical Engineering, National Tsing Hua University, Hsin-Chu, Taiwan In the field of secondary batteries, the growing diversity of possible applications for energy storage has led to the investigation of numerous alternative systems to the state-of-the-art lithium-ion battery. Metal-air batteries are one such technology, due to promising specific energies that could reach beyond the theoretical maximum of lithium-ion. Much focus over the past decade has been on lithium and sodium-air, and, only in recent years, efforts have been stepped up in the study of divalent metal-air batteries. Within this article, the opportunities, progress, and challenges in nonaqueous rechargeable magnesium and calcium-air batteries will be examined and critically reviewed. In particular, attention will be focused on the electrolyte development for reversible metal deposition and the positive electrode chemistries (frequently referred to as the “air cathode”). Synergies between two cell chemistries will be described, along with the present impediments required to be overcome. Scientific advances in understanding fundamental cell (electro)chemistry and Edited by: Jian Liu, electrolyte development are crucial to surmount these barriers in order to edge these University of British Columbia technologies toward practical application. Okanagan, Canada Reviewed by: Keywords: metal-air batteries, divalent cations, magnesium batteries, calcium batteries, metal electroplating, oxygen electrochemistry Liqiang Mai, Wuhan University of Technology, China Vincenzo Baglio, INTRODUCTION National Research Council (CNR), Italy *Correspondence: Energy storage technologies are under extensive investigation because they could contribute towards Laurence J. -
Chemoselective Oxidation of Aryl Organoboron Systems Enabled by Boronic Acid-Selective Phase Cite This: Chem
Chemical Science View Article Online EDGE ARTICLE View Journal | View Issue Chemoselective oxidation of aryl organoboron systems enabled by boronic acid-selective phase Cite this: Chem. Sci.,2017,8,1551 transfer† John J. Molloy,a Thomas A. Clohessy,ab Craig Irving,a Niall A. Anderson,b Guy C. Lloyd-Jonesc and Allan J. B. Watson*a We report the direct chemoselective Brown-type oxidation of aryl organoboron systems containing two oxidizable boron groups. Basic biphasic reaction conditions enable selective formation and phase transfer of a boronic acid trihydroxyboronate in the presence of boronic acid pinacol (BPin) esters, while avoiding speciation equilibria. Spectroscopic investigations validate a base-promoted phase-selective discrimination of organoboron species. This phenomenon is general across a broad range of organoboron compounds and can also be used to invert conventional protecting group strategies, Received 7th September 2016 enabling chemoselective oxidation of BMIDA species over normally more reactive BPin substrates. We Accepted 25th October 2016 Creative Commons Attribution 3.0 Unported Licence. also demonstrate the selective oxidation of diboronic acid systems with chemoselectivity predictable DOI: 10.1039/c6sc04014d a priori. The utility of this method is exemplified through the development of a chemoselective oxidative www.rsc.org/chemicalscience nucleophile coupling. Introduction the broadly similar reactivity prolesofboronicacidsand esters,11 and the added complication of speciation equilibria,11–13 The use of di- and multi-boron containing systems has become establishing chemoselective control within mixed organoboron a powerful approach for the rapid synthesis of highly func- systems represents a signicant challenge. However, the identi- This article is licensed under a tionalized molecules from readily accessible starting mate- cation of new chemoselective control mechanisms would be rials.1,2 Chemoselectivity in these systems is currently achieved a fundamental advance, enabling the design and development of using only two approaches. -
Electrochemistry with Ultrasound
ELECTROCHEMISTRY WITH ULTRASOUND University of Coventry. UK University of Oxford. UK University of Southampton. UK Academy of Sciences of the Czech Republic. Czech Republic Département de Chimie. Ecole Normale Supérieure.Paris. France University of Franché-Comte. France University of Alicante. Spain ELECTROCHEMISTRY WITH ULTRASOUND Environmental applications *Improved strategies for waste minimisation: obviation of environmentall-unfriendly systems in synthesis sonoelectrochemical reactor design *Degradation of pollutants and enhanced environmental clean-up using sonoelectrochemistry New systems *Novel electrosynthesis reactions with applications in organic and biochemistry *Novel functional materials and their practical applications, including nanoparticles and conducting polymers. *Development of new electrode materials and the understanding of surface processes in these processes Technological applications *Improved methods for electrodeposition, electrodissolution, including effects on morphology, hardness, microestructure... *Scale-up form micro-scale to pilot-plant scale Electroanalysis *Development of enhanced elecroanalytical procedures that are effective in real media, leading to imporved sensors and biosensors * Sensitive electroanalyses for metal ions and other deleterious electroactive species in the environment WORK PROGRAMME FOR THIS TERM Events Kick off COST D-32 Meeting, held in Alicante, July 2004. Kick off Working Group Meeting , held in Alicante, December 2004. Annual Working Group Meeting , held in Prague, November -
Sonoelectrochemistry – the Application of Ultrasound to Electrochemical Systems
Issue in Honor of Dr. Douglas Lloyd ARKIVOC 2002 (iii) 198-218 Sonoelectrochemistry – The application of ultrasound to electrochemical systems David J. Walton School of Science and the Environment, Coventry University, Priory Street, Coventry CV1 5FB, UK E-mail: [email protected] This paper is dedicated to Douglas Lloyd on the occasion of his eightieth birthday Abstract This paper comprises the text of a review lecture on the subject of the effects of ultrasound upon mass transport, upon electrode surface phenomena, upon the behaviour of species and upon reaction mechanisms, and selected examples of the benefits of insonation in electroanalysis, electrosynthesis, electrodeposition and electrochemiluminescence are discussed. Keywords: Sonoelectrochemistry, ultrasound, acoustics, electrosynthesis, electroanalysis, voltammetry, conducting polymers, electrodeposition, cavitation, reaction mechanisms Introduction Electrochemistry is an old discipline. Faraday worked through the 1830’s, and Kolbe reported his electroorganic synthetic reaction in 1849.1 The vibration of electrochemical cells is likewise a concept of some standing, and Moriguchi reported the improvement of water electrolysis by insonation in 1934.2. Thereafter, sporadic reports can be found on sonoelectrochemistry, although this term was not used as a descriptor until more recently. This period included an extensive study by Yeager upon the physicochemical parameters of ionic solutions.3 Ultrasound ISSN 1424-6376 Page 198 ©ARKAT USA, Inc Issue in Honor of Dr. Douglas Lloyd -
Synthesis of Organofluorine Compounds and Allenylboronic Acids - Applications Including Fluorine-18 Labelling Denise N
Denise N. Meyer Synthesis of Organofluorine Compounds and Allenylboronic Synthesis of Organofluorine Compounds and Allenylboronic Acids - Applications Including Fluorine-18 Labelling Applications Acids - Allenylboronic Synthesis of Organofluorine Compounds and Acids - Applications Including Fluorine-18 Labelling Denise N. Meyer Denise N. Meyer Raised in Lauterecken, South-West Germany, Denise studied chemistry at Johannes Gutenberg University Mainz where she obtained her Bachelor's and Master's degree. In 2017, she moved to Stockholm where she pursued her doctoral studies with Prof. Kálmán J. Szabó. ISBN 978-91-7911-490-9 Department of Organic Chemistry Doctoral Thesis in Organic Chemistry at Stockholm University, Sweden 2021 Synthesis of Organofluorine Compounds and Allenylboronic Acids - Applications Including Fluorine-18 Labelling Denise N. Meyer Academic dissertation for the Degree of Doctor of Philosophy in Organic Chemistry at Stockholm University to be publicly defended on Friday 4 June 2021 at 10.00 in Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 16 B. Abstract This work is focused on two areas: the chemistry of organofluorine and organoboron compounds. In the first chapter, a copper-catalysed synthesis of tri- and tetrasubstituted allenylboronic acids is presented. Extension of the same method leads to allenylboronic esters. The very reactive and moisture-sensitive allenylboronic acids are further applied to the reaction with aldehydes, ketones and imines to form homopropargyl alcohols and amines. In addition, an enantioselective reaction catalysed by a BINOL organocatalyst was developed to form tertiary alcohols with adjacent quaternary carbon stereocenters. The second chapter specialises in the functionalisation of 2,2-difluoro enol silyl ethers with electrophilic reagents under mild reaction conditions.