Počet záznamů: 1
Multivalent Bifunctional Carbosilane Dendrimer Supported Ammonium and Phosphonium Organocatalysts for the Coupling of CO2 and Epoxides.
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SYSNO ASEP 0531168 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Multivalent Bifunctional Carbosilane Dendrimer Supported Ammonium and Phosphonium Organocatalysts for the Coupling of CO2 and Epoxides. Tvůrce(i) Červenková Šťastná, Lucie (UCHP-M) RID, ORCID, SAI
Krupková, Alena (UCHP-M) RID, ORCID, SAI
Petričkovič, Roman (UCHP-M) RID, SAI
Müllerová, Monika (UCHP-M) RID, ORCID, SAI
Matoušek, J. (CZ)
Koštejn, Martin (UCHP-M) RID, SAI, ORCID
Cuřínová, Petra (UCHP-M) RID, SAI, ORCID
Jandová, Věra (UCHP-M) RID, ORCID, SAI
Šabata, Stanislav (UCHP-M) RID, ORCID, SAI
Strašák, Tomáš (UCHP-M) RID, ORCID, SAIZdroj.dok. ACS Sustainable Chemistry & Engineering. - : American Chemical Society - ISSN 2168-0485
Roč. 8, č. 31 (2020), s. 11692-11703Poč.str. 12 s. Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova polycationic carbosilane dendrimers ; dendritic ionic liquids ; chemical fixation of CO2 Vědní obor RIV CC - Organická chemie Obor OECD Organic chemistry CEP GC19-23760J GA ČR - Grantová agentura ČR Způsob publikování Open access s časovým embargem (11.08.2021) Institucionální podpora UCHP-M - RVO:67985858 UT WOS 000562123100022 EID SCOPUS 85091650441 DOI 10.1021/acssuschemeng.0c03367 Anotace Insertion of carbon dioxide into structure of organic epoxides leads to a formation of valuable cyclic carbonates and polycarbonates. For the purpose of this process, we report here a series of recyclable organocatalysts with superior activity. Carbosilane dendrimers (1st to 3rd generation) are employed as a support to which periphery ammonium or phosphonium centers are covalently attached to form a dendritic ionic liquid (DIL). Obtained DILs were tested as homogeneous catalysts in cycloaddition of CO2 to epoxides with respect to their activity and recyclability. The catalytic performance of active sites is enhanced by the presence of proximal hydroxyl group, playing the role of hydrogen bond donor. Experimentally observed synergistic effect was confirmed by Density Functional Theory (DFT) calculations. The activity of DILs is affected more by the structure of onium salt than by the size of support (dendrimer generation). Dendritic catalysts of all tested generations could be recovered by nanofiltration and repeatedly reused. In order to simplify the separation of the catalysts, composite materials were prepared by intercalating the more active ammonium dendrimers into the interlayer space of natural montmorillonite. Resulting heterogeneous catalysts were easily separable by centrifugation, while retaining reasonable level of activity. Pracoviště Ústav chemických procesů Kontakt Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227 Rok sběru 2021 Elektronická adresa http://hdl.handle.net/11104/0310792
Počet záznamů: 1