AFBC of coal with tyre rubber. Influence of the co-combustion variables on the mineral matter of solid by-products and on Zn lixiviation

The study focuses on the generation and distribution of mineral species in fly and bottom ashes. These were formed during a fluidised co-combustion of a fossil fuel (coal) and a non-fossil fuel (tyre rubber) in a small fluidised bed combustor (7cm x 70cm). The pilot plant had continuous fuel feed using varying ratios of coal and rubber. The study also focuses on the lixiviation behaviour of metallic elements with the assessement of zinc recovering

Propiedades topológicas en nanofotónica: materiales de anchura atómica en presencia de nanoestructuras metálicas

En este trabajo se combinan los materiales bidimensionales o de anchura atómicas con las estructuras metálicas perforadas con el objetivo de desarrollar un modelo teórico capaz de abarcar los resultados experimentales que estos sistemas han producido: C. Genet et al. en ACS Photonics, 5(4):1281–1287, January 2018. <br /

Copper-catalyzed protoboration of borylated dendralenes: a regio- and stereoselective access to functionalized 1,3-dienes

A copper-catalyzed protoboration of borylated dendralenes is reported. The method employs an NHC–Cu catalyst and provides access to 1,4-addition products with excellent levels of chemo-, regio- and stereoselectivity. The resulting diene bis(boronates) are oxidized to the corresponding diene diols which are synthetically versatile building blocksFinancial support from the AEI (CTQ2017-88451-R), Xunta de Galicia (ED431C 2018/04; Centro singular de investigación de Galicia accreditation 2019–2022, ED431G 2019/03) and the European Union (European Regional Development Fund – ERDF) is gratefully acknowledged. E. R.-C. thanks Xunta de Galicia for predoctoral fellowshipS

Copper-Catalyzed Enantioselective Borylative Allyl–Allyl Coupling of Allenes and Allylic gem-Dichlorides

A catalytic asymmetric reaction between allenes, bis(pinacolato)diboron, and allylic gem-dichlorides is reported. The method involves the coupling of a catalytically generated allyl copper species with the allylic gem-dichloride and provides chiral internal 1,5-dienes featuring (Z)-configured alkenyl boronate and alkenyl chloride units with high levels of chemo-, regio-, enantio-, and diastereoselectivity. The synthetic utility of the products is demonstrated with the synthesis of a range of optically active compounds. DFT calculations reveal key noncovalent substrate–ligand interactions that account for the enantioselectivity outcome and the diastereoselective formation of the (Z)-alkenyl chlorideFinancial support from the AEI (PID2020-118237RB-I00), European Research Council (863914), Xunta de Galicia (ED431C 2022/27; Centro singular de investigación de Galicia accreditation 2019-2022, ED431G 2019/03), and the European Regional Development Fund (ERDF) is gratefully acknowledged. M.P.-S. and A.M.A.-C. thank AEI and Xunta de Galicia, respectively, for predoctoral fellowships. We also thank the use of RIAIDT-USC analytical facilities and CESGA (Xunta de Galicia) for computational timeS

Bifunctional Skipped Dienes through Cu/Pd-Catalyzed Allylboration of Alkynes with B2pin2 and Vinyl Epoxides

A method for the use of vinyl epoxides in catalytic allylboration of alkynes is described. This transformation allows for the synthesis of bifunctional skipped dienes bearing both an allylic alcohol and an alkenylboronate from simple starting materials with high regio- and stereoselectivity. These two functionalities provide these products with highly versatile reactivity, as shown by their stereocontrolled conversion into cyclic boron compounds and polyenesFinancial support from AEI (PID2020-118237RB-I00), the European Research Council (863914), the Xunta de Galicia (Centro singular de investigación de Galicia accreditation 2019-2022, ED431G 2019/03), and the European Regional Development Fund (ERDF) is gratefully acknowledged. N.V.-G. thanks AEI for an FPI Predoctoral FellowshipS

Enantio- and Diastereoselective Copper-Catalyzed Allylboration of Alkynes with Allylic gem-Dichlorides

A highly chemo-, regio-, enantio- and diastereoselective coupling of terminal alkynes, bis(pinacolato)diboron and allylic gem-dichlorides is reported. The method uses a chiral NHC−Cu catalyst which generates, in a single step, synthetically versatile chiral skipped dienes bearing a Z-alkenyl chloride, a trisubstituted E-alkenyl boronate and a bis-allylic stereocenter. Allylic gem-dichlorides are shown to be efficient substrates for catalytic asymmetric allylboration of alkynes. The method employs a chiral NHC−Cu catalyst capable of generating in a single step chiral skipped dienes bearing a Z-alkenyl chloride, a trisubstituted E-alkenyl boronate and a bis-allylic stereocenter with excellent levels of chemo-, regio- enantio- and diastereoselectivity. This high degree of functionalization makes these products versatile building blocks as illustrated with the synthesis of several optically active compounds. DFT calculations support the key presence of a metal cation bridge ligand–substrate interaction and account for the stereoselectivity outcomeFinancial support from the AEI (PID2020-118237RB-I00), Xunta de Galicia (ED431C 2018/04; Centro singular de investigación de Galicia accreditation 2019–2022, ED431G 2019/03) and the European Union (European Regional Development Fund - ERDF) is gratefully acknowledged. A. M. A.-C. thanks Xunta de Galicia for a predoctoral fellowship.S

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Z-Selective Copper-Catalyzed Asymmetric Allylic Alkylation with Grignard Reagents

Allylic gem-dichlorides undergo regio- and enanantioselective (er up to 99:1) copper-catalyzed allylic alkylation with Grignard reagents affording chiral Z-vinyl chlorides. This highly versatile class of synthons can be subjected to Suzuki cross coupling affording optically active Z-alkenes and 1,3-cis,trans dienes

Visita a la Biblioteca Rector Gabriel Ferraté de la UPC

La visita va tenir lloc el 3 de juliol de 2019. El grup format per tres persones, una de la UPF, altra de la UAB i jo mateixa de la UB, va ser rebut per Miquel Codina, Cap de la BRGF. També van participar a la sessió Ruth Íñigo, Responsable de Serveis de Recerca, Jordi Prats, Cap de la IDP i Fran Máñez, Informàtic del SBPA de la UPC

Direct C–H Allylation of Unactivated Alkanes by Cooperative W/Cu Photocatalysis

Here we report a photocatalytic methodology that enables the direct allylation of strong aliphatic C–H bonds with simple allylic chlorides. The method relies on a cooperative interaction of two metal catalysts in which the decatungstate anion acts as a hydrogen-atom abstractor generating a nucleophilic carbon-centered radical that engages in an SH2′ reaction with an activated allylic π-olefin–copper complex. Because of this dual catalysis, the protocol allows for the functionalization of a range of chemical feedstocks and natural products under mild conditions in short reaction timesFinancial support from the European Research Council (ERC-CoG 863914-BECAME), Agencia Estatal de Investigación (PID2020-118237RB-I00), Xunta de Galicia (ED431C 2018/04; Centro singular de investigación de Galicia accreditation 2019-2022, ED431G 2019/03), and the European Regional Development Fund (ERDF) is gratefully acknowledgedS