Xavi Ribas

Sustainable C-X and C-H functionalization catalyzed by first-row transition metals.

Contact info:
Dr. Xavi Ribas
xavi.ribas@udg.edu
Tel. (+34) 972 41 91 94
Website

XaviRibas

Selected publications


Alicia Casitas, Mercè Canta, Miquel Solà, Miquel Costas, Xavi Ribas*
Nucleophilic Aryl Fluorination and Aryl Halide Exchange Mediated by a Cu(I)/Cu(III) Catalytic Cycle
J. Am. Chem. Soc., 2011, 133, 19386-19392
DOI:

Alicia Casitas and Xavi Ribas*
The role of organometallic copper(III) complexes in homogeneous catalysis
Chem. Sci. 2013, 4, 2301-2318
Impact Factor: 9.211
DOI:

Marc Font, Ferran Acuña-Parés, Teodor Parella, Jordi Serra, Josep M. Luis, Julio Lloret-Fillol, Miquel Costas, Xavi Ribas*
Direct observation of two-electron Ag(I)/Ag(III) redox cycles in coupling catalysis
Nature Commun. 2014, 5, 4373
DOI: 10.1038/ncomms5373

Cristina García-Simón, Marc Garcia-Borràs, Laura Gómez, Teodor Parella, Sílvia Osuna, Jordi Juanhuix, Inhar Imaz, Daniel Maspoch, Miquel Costas,* Xavi Ribas*
Sponge-like molecular cage for purification of fullerenes
Nature Commun. 2014, 5, 5557
DOI: 10.1038/ncomms6557

Jordi Serra, Christopher J. Whiteoak, Ferran Acuña-Parés, Marc Font, Josep M. Luis, Julio Lloret Fillol, Xavi Ribas*
Oxidant-Free Au(I)-Catalyzed Halide Exchange and Csp2-O Bond Forming Reactions
J. Am. Chem. Soc., 2015, 137, 13389?13397
DOI:

+ Publications

Dr. Xavi Ribas

Xavi Ribas (1974, Santa Coloma de Farners) obtained his PhD in Chemistry at the University of Girona (UdG) in 2001, and he carried out a 3-year postdoc at ICMAB-CSIC in 2002-2004. He was promoted to Associate professor in Chemistry at UdG in 2006. He got an ICREA-Acadèmia Award in 2010 and an ERC-StG project in 2011. His research focuses on in-depth mechanistic understanding of the organometallic chemistry of copper, silver and gold. He is interested in coinage metal-catalyzed C-C and C-heteroatom cross-coupling reactions and C-H activation with directing groups. He is also interested in the involvement of Fe and Mn high oxidation states in alkane and alkene oxidations. The development of nanocages for catalysis and host-guest reactions is also pursued.

Research overview

Copper-catalyzed cross-coupling reactions for the formation of aryl?heteroatom bonds (Ullmann reaction) is currently a hot topic, due to the importance of developing new sustainable synthetic tools. However, several mechanistic key aspects are still under debate. Our goal is to design new catalysts capable of effecting the desired transformations under mild conditions. A breakthrough finding of our group has been the recognition of the CuI/CuIII catalytic redox cycle as a viable mechanism in Ullmann-type catalysis. This coupling reactivity has been translated for the first time to the other coinage metals, i.e. AgI/AgIII and AuI/AuIII catalytic cycles. Our research interests also involve the development and mechanistic understanding of C-H activation catalyzed by cheaper and less toxic first-row transition metal, especially Co and Ni. Finally, the catalytic procedures are explored in confined environments using supramolecular metallocages, including asymmetric transformations via organometallic catalysis.

Sustanaible C-X and C-H functionalization catalyzed by first-row transition metals.

Copper-catalyzed cross-coupling reactions for the formation of aryl?heteroatom bonds (Ullmann reaction) is currently a hot topic, due to the importance of developing new sustainable synthetic tools. For the past 10 years many copper-mediated or catalyzed procedures have been developed, usually by activation of aryl halide substrates. However, several mechanistic key aspects are still under debate. Our goal is to design new catalysts capable of effecting the desired transformations under mild conditions. A breakthrough finding of our group has been the recognition of the CuI/CuIII catalytic redox cycle as a viable mechanism in Ullmann-type catalysis.

The development of more sustainable direct C-H functionalization reactions, catalyzed by transition-metals, is another enormous challenge, Our research is focused on the quest of cheaper and less toxic first-row transition metal activation of C-H bonds, with the understanding of the molecular mechanism of such transformations as a major goal.

XaviRibas_RL_1

Catalysis in the confined space

The supramolecular design of tridimensional capsules is pursued through metal-driven self-assembly, with potential applications as reaction nanovessels and supramolecular hosts. Along this strategy, we have been able to synthesize a variety of structures that include molecular nanosized squares and rectangles, helicates and trigonal and tetragonal prismatic nanocapsules. We are investigating the use of anchor-containing nanocapsules to fix selected metal catalysts inside the cavity and explore its catalytic properties. We have been able to demonstrate the effectiveness of asymmetric hydroformylation catalyzed by Rh using metaloporphyrin-containing tetragonal prismatic nanocapsules. Moreover, the host-guest properties of nanocapsules are currently being explored in the purification of fullerenes.

XaviRibas_RL_2

People

Principal Investigator

XaviRibas
Xavi Ribas

Prof. Agregat


Staff and Posdocs

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Màrius Tarrés

Postdoc

vladmartin
Vlad Martin-Diaconescu

Postdoc (JdC)


PhD and MACMoM students

CarlesFuertes
Carles Fuertes

PhD student

Supervisor:
- M. Costas
- C. Fuertes

JordiSerra
Jordi Serra

PhD student (UdG)

Supervisor:
- X. Ribas

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Marco Cianfanelli

PhD student (MSCA ITN)

Supervisor:
- M. Costas
- X. Ribas

MireiaRovira
Mireia Rovira

PhD student

Supervisor:
- X. Ribas

OriolPlanas
Oriol Planas

PhD student (FPU)

Supervisor:
- A. Company
- X. Ribas

StevenRoldan
Steven Roldán

PhD student (FPI)

Supervisor:
- Josep M. Luís
- X. Ribas

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Pau Font

MACMoM student

Supervisor:
- X. Ribas


Funding

ERC Projects. ERC Starting Grants

Project: Sustainable C-X and C-H Functionalization Catalyzed by Copper(III) Species (SUSCATCU3)
Researcher: Dr. Xavi Ribas
Reference: ERC-2011-StG-277801
Funding: 1.490.000 €
Periode: 2011 – 2016

ERC Projects. ERC Proof of concept

Project: Copper Catalysis Applications (CatalApp)
Researcher: Dr. Xavi Ribas
Reference: ERC-2015-PoC-709590
Funding: 150.000 €
Periode: 2016 – 2016

ICREA Acadèmia Awards

Project: Programa ICREA Acadèmia 2015
Researcher: Dr. Xavi Ribas
Reference: ICREA Acadèmia 2015
Funding: 205.000 €
Periode: 2015 – 2019

MINECO Projects. Proyectos I+D

Project: Model platforms for the mechanistic understanding of C-H and C-X functionalizations (MODMECH)
Researcher: Dr Xavi Ribas & Dr Anna Company
Reference: CTQ2016-77989-P
Funding: 135.000 €
Periode: 2017 – 2019

MINECO Projects. Proyectos Redes de Excelencia

Project: Complejos metálicos biomiméticos: Utilización de oxígeno, hidrógeno y dióxido de carbono (H2BioCatO2)
Researcher: Dr. Miquel Costas & Dr. Xavi Ribas
Reference: CTQ2015-71470-REDT
Funding: 30.000 €
Periode: 2015 – 2016

News

ERC_PoC_wordpress
Two European research projects (ERC-PoC)

Recently researchers of the IQCC and research group QBIS-Cat of the University of

Xavi_icrea_2nd
Xavi Ribas repeats the ICREA Acadèmia award

Today ICREA announced the list of winners of the ICREA Acadèmia awards 2015,

ScienceSlam2015_Carbo
First Science Slam IQCC within Science Week

The Institute of Computational Chemistry and Catalysis of the University of Girona organizes the 1st Science

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Seminar by Prof. Ken Sakai on Molecular photocatalysis

Today we had the pleasure of having Prof. Ken Sakai visiting the IQCC,