Viewing upcoming talks in: Cond Mat Seminars
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Special SeminarsOrganocatalysis Using N-Heterocyclic Carbenes
Speaker: Prof Michel Gravel (Saskatchewan)
Organocatalysis Using N-Heterocyclic Carbene s Michel Gravel University of Saskatchewan N-Heterocyclic c arbenes (NHCs) are well known for their ability to catalytically generate nucleophilic acyl anion equivalents from ald ehydes. This catalytic manifold is best exemplified by the benzoin and Stetter reactions generating α-hydroxyketones and 1,4 -dicarbonyl products, respectively. However, some of the most synthetically useful substrate combinations are not currently amenable to reactions in high chemo - or enanti oselectivity. For instance, the use of two distinct aldehydes in the cross -benzoin reaction or of simple unsaturated ketones in the intermolecular Stetter reaction do not gen erally provide products in high yield and/or enantiomeric ratio. We have rec ently made some headway in addressing both of these challenges through the use of triazolium , oxazolium, and bis(dialkylamino)cyclopropenium salts. Our progr ess in improving the scope as well as the chemo - and stereoselectivity of these classical reaction s will be presented. Download PDFOn: August 29, 2019 From: 14h00 To: 15h00
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Irvine Lectures
f-Block Chemistry: Periodicity and the Intricacies of Uranium
Speaker: Prof Steve Liddle (University of Manchester)
On: September 18, 2019 From: 15h00 To: 15h50
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Cond Mat Seminars
Allan MacDonald
Speaker: Allan MacDonald (UT Austin)
On: September 18, 2019 From: 12h00 To: 13h00
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Irvine Lectures
Elemental Fluorine
Speaker: Prof Graham Sandford (University of Durham)
On: September 18, 2019 From: 14h05 To: 14h55
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Irvine Lectures
Designing materials for all solid-state Li and Na ion batteries
Speaker: Prof Serena Corr (University of Sheffield)
On: September 18, 2019 From: 16h05 To: 16h55
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EaStCHEM ColloquiaLewis Acidic Boranes In Synthesis And Catalysis
Speaker: Dr Rebecca Melen (Cardiff)
LEWIS ACIDIC BORANES IN SYNTHESIS AND CATALYSIS Rebecca L. Melen 1* 1 School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, UK Email: MelenR@cardiff.ac.uk As main group chemistry, in particular boron chemistry, has expanded and developed over the past 20 years, one reagent has risen to prominence as well. Tris(pentafluorophenyl)borane, B(C 6F5)3, (commonly known as BCF) has demonstrated extensive applications in a wide variety of chemistry, including borylations, hydrogenations, hydrosilylations, frustrated Lewis pair chemistry, Lewis acid catalysis and more. 1 The high Lewis acidity of B(C 6F5)3 is achieved from the electronic effects of its three C 6F5 rings, rendering it a versatile reagent for a great number of reactions. The talk will show our recent uses of Lewis acidic boranes in organic synthesis and catalysis (Figure 1) and will also focus on our latest advances in novel borane and borocation usage. 2-5 Figure 1
1. G. Erker, Dalton Trans ., 2005 , 1883; G. C. Welch, R. R. San Juan, J. D. Masuda, D. W. Stephan, Science, 2006, 314, 1124; R. L. Melen, Chem. Commun ., 2014 , 50 , 1161. 2. L. C. Wilkins, B. A. R. G ünther , M. Walther, J. R. Lawson, T. Wirth, R. L. Melen, Angew. Chem. Int. Ed ., 2016, 55, 11292. 3. I. Khan, B. G. Reed -Berendt, R. L. Melen, L. C. Morrill, Angew. Chem. Int. Ed ., 2018 , 57 , 12356. 4. I. Khan, M. Manzotti, G. J. Tizzard, S. J. Coles, R. L. Melen , L. C. Morrill, ACS Catalysis , 2017 , 7, 7748. 5. M. Santi, D. M. C. Ould, J. Wenz, Y. Soltani, R. L. Melen, T. Wirth, Angew. Chem. Int. Ed ., 2019 , 58 , 7861. Download PDFOn: September 25, 2019 From: 14h56 To: 16h30
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