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Rebecca Melen

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Research Groups: Inorganic Chemistry

Research Interests

Main Group chemistry has undergone a renaissance in recent years with the realisation that the reactivity of main group elements often closely resembles that of transition metals, with recent studies revealing that main group elements can act as homogenous catalysts for a range of transformations. The development of main group alternatives to conventional transition metal catalysts is an emerging $acirc; hot topic$acirc; . Previous research by Melen pioneered the use of Main-Group complexes in the catalytic dehydrocoupling of amino-boranes [1] for which she received the RSC Dalton Young Researcher Award (2013). Her subsequent studies on heterocyclic synthesis via Main Group Lewis acid promoted organic transformations [2] coupled with her dehydrocoupling studies led to her European Young Researcher Award (2014). Amongst her published research, she has several articles designated as $acirc; hot papers$acirc; and/or reflected in Front/Inside Cover artwork. Research projects in the Melen group draw together several different areas of chemistry including organic and inorganic synthesis, main group chemistry, catalysis and implement a range of physical characterisation methods (including multinuclear NMR and X-ray diffraction) supported by computational studies.

References:

[1]   Chem. Commun., 2011, 47, 2682; Chem. Sci., 2011, 2, 155; RSC Advances, 2012, 2, 2191.

[2]   Chem. Eur. J., 2013, 19, 11928; J. Am. Chem. Soc., 2014, 136, 777; Chem. Commun., 2014, 50, 1161 (inside cover); Chemical Commun., 2014, 50, 7243-7245 (Front cover).

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Research in the Melen group focuses on the use of main group Lewis acids in organic synthesis and catalysis. The research programme includes:

  • Main group catalyst design including tuning the steric and electronic effects of the Lewis acid.
  • Applications of main group Lewis acids in organic synthesis and catalytic processes.
  • Mechanistic studies to determine reaction pathways and the role of the Lewis acid in the reactions using combinations of experimental and theoretical methods.

Recent Progress:

The Lewis acidic nature of Main Group compounds can be tailored electronically and sterically by substituents. We have implemented the Lewis-acid nature of Main Group compounds to drive a range of important chemical transformations which have potential applications in the synthesis of pharmaceutically important organic heterocycles and/or in materials chemistry. Recent results have shown that the boron Lewis acid B(C6F5)3 could promote both stoichiometric (and catalytic) organic cyclisation processes in heterocyclic synthesis (Fig. 1). These studies established that B(C6F5)3 was capable of acting in a similar way to transition metal catalysts allowing the conversion of propargyl amides into oxazoles. Depending on the substituents R and temperature, we were able to identify almost every intermediate in the reaction pathway.

Fig. 1.

However, the main group Lewis acidic B(C6F5)3 can lead to some very different outcomes than those observed for transition metal catalysed transformations. For example, replacement of the propargyl amide by a propargyl ester leads to marked differences in reactivity. Relating to this, the reactions of B(C6F5)3 with propargyl esters yield allyl boron reagents which can undergo addition to aldehydes to afford novel aldol products in a one-pot reaction (Fig. 2).

Fig. 2.

Addysgu

CH5301 Adweithedd a Phriodweddau'r Elfennau a'u Cyfansoddion

CH3404 Synthesis Anghymesur o Fferyllol a Chynhyrchion Naturiol

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Penodiadau Proffesiynol

2021Athro presennol mewn Cemeg Anorganig, Prifysgol Caerdydd, y DU.  

20192021 Darllenydd mewn Cemeg Anorganig, Prifysgol Caerdydd, y DU. 

2017–2019 Uwch Ddarlithydd mewn Cemeg Anorganig, Prifysgol Caerdydd, y DU. 

20152016 Athro Gwadd gyda'r Athro Dr. Martin Oestreich fel rhan o Wobr Clara Immerwahr , Technische Universität Berlin, yr Almaen. 

2014–2017 Darlithydd mewn Cemeg Anorganig, Prifysgol Caerdydd, y DU. 

20132014 Cymrodoriaeth Alexander von Humboldt gyda'r Athro Dr. Lutz H. Gade, Ruprecht-Karls-Universität Heidelberg, yr Almaen.  

20122013 Cymrodoriaeth Ôl-ddoethurol gyda'r Athro Douglas W. Stephan, Prifysgol Toronto, Canada.    

 

Addysg a Hyfforddiant

2012 PhD "Catalytic Versus Stoichiometric Dehydrocoupling Using Main Group Metals", Adran Cemeg, Prifysgol Caergrawnt, y DU. Yr Athro Dominic S. Wright 

2011 MA, Adran Cemeg, Prifysgol Caergrawnt, y DU. 

2008 MSc, Adran Cemeg, Prifysgol Caergrawnt, y DU. 

2008 BA, Adran Cemeg, Prifysgol Caergrawnt, y DU. 

 

Anrhydeddau a dyfarniadau

Gwobr Philip Leverhulme 2022

2022 Etholwyd yn Gymrawd Cymdeithas Ddysgedig Cymru 

Cymrodoriaeth Cynhadledd Bürgenstock 2019

Gwobr  Goffa RSC Harrison Meldola 2019

2019 Cymdeithas Ddysgedig Cymru, Medal Dillwyn

Enillydd Gwobr Thieme Journal 2018.  

2016 Cymrawd Academi Addysg Uwch.  

2016 Gwobr  C lara Immerwahr

Gwobr  Ymchwilydd Ifanc RSC Dalton 2013

Aelodaethau proffesiynol

Cymdeithas Ddysgedig Cymru 

Cymdeithas Gemeg Frenhinol

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Contact Details

Email MelenR@caerdydd.ac.uk
Telephone +44 29208 79667
Campuses Y Ganolfan Ymchwil Drosiadol, Ystafell 0.54, Heol Maindy, Cathays, Caerdydd, CF24 4HQ

Themâu ymchwil

Arbenigeddau

  • Cemeg anorganig
  • Cemeg organig
  • Catalysis homogenaidd