Multivalent Bifunctional Carbosilane Dendrimer Supported Ammonium and Phosphonium Organocatalysts for the Coupling of CO2 and Epoxides.

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985858%3A_____%2F20%3A00531168" target="_blank" >RIV/67985858:_____/20:00531168 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/44555601:13440/20:43895559

Výsledek na webu

<a href="http://hdl.handle.net/11104/0310792" target="_blank" >http://hdl.handle.net/11104/0310792</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acssuschemeng.0c03367" target="_blank" >10.1021/acssuschemeng.0c03367</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Multivalent Bifunctional Carbosilane Dendrimer Supported Ammonium and Phosphonium Organocatalysts for the Coupling of CO2 and Epoxides.

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Multivalent Bifunctional Carbosilane Dendrimer Supported Ammonium and Phosphonium Organocatalysts for the Coupling of CO2 and Epoxides.

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10401 - Organic chemistry

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

ACS Sustainable Chemistry & Engineering

ISSN

2168-0485

e-ISSN

—

Svazek periodika

8

Číslo periodika v rámci svazku

31

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

12

Strana od-do

11692-11703

Kód UT WoS článku

000562123100022

EID výsledku v databázi Scopus

2-s2.0-85091650441