The efficient catalysis of oxidative alkylation and fluoroalkylation of aromatic C-H bonds is of paramount importance in the pharmaceutical and agrochemical industries, and requires the development of convenient Ag0-based nano-architectures with high catalytic activity and recyclability. We prepared Ag-doped silica nanoparticles (Ag0/+@SiO2) with a specific nano-architecture, where ultra-small sized silver cores are immersed in silica spheres, 40 nm in size. The nano-architecture provides an efficient electrochemical oxidation of Ag+@SiO2 without any external oxidant. In turn, Ag+@SiO2 5 mol% results in 100% conversion of arenes into their alkylated and fluoroalkylated derivatives in a single step at room temperature under nanoheterogeneous electrochemical conditions. Negligible oxidative leaching of silver from Ag0/+@SiO2 is recorded during the catalytic coupling of arenes with acetic, difluoroacetic and trifluoroacetic acids, which enables the good recyclability of the catalytic function of the Ag0/+@SiO2 nanostructure. The catalyst can be easily separated from the reaction mixture and reused a minimum of five times upon electrochemical regeneration. The use of the developed Ag0@SiO2 nano-architecture as a heterogeneous catalyst facilitates aromatic C-H bond substitution by alkyl and fluoroalkyl groups, which are privileged structural motifs in pharmaceuticals and agrochemicals.

Silica-supported silver nanoparticles as an efficient catalyst for aromatic C-H alkylation and fluoroalkylation / Khrizanforov M.N.; Fedorenko S.V.; Mustafina A.R.; Kholin K.V.; Nizameev I.R.; Strekalova S.O.; Grinenko V.V.; Gryaznova T.V.; Zairov R.R.; Mazzaro R.; Morandi V.; Vomiero A.; Budnikova Y.H.. - In: DALTON TRANSACTIONS. - ISSN 1477-9226. - ELETTRONICO. - 47:29(2018), pp. 9608-9616. [10.1039/c8dt01090k]

Silica-supported silver nanoparticles as an efficient catalyst for aromatic C-H alkylation and fluoroalkylation

Mazzaro R.;Morandi V.;
2018

Abstract

The efficient catalysis of oxidative alkylation and fluoroalkylation of aromatic C-H bonds is of paramount importance in the pharmaceutical and agrochemical industries, and requires the development of convenient Ag0-based nano-architectures with high catalytic activity and recyclability. We prepared Ag-doped silica nanoparticles (Ag0/+@SiO2) with a specific nano-architecture, where ultra-small sized silver cores are immersed in silica spheres, 40 nm in size. The nano-architecture provides an efficient electrochemical oxidation of Ag+@SiO2 without any external oxidant. In turn, Ag+@SiO2 5 mol% results in 100% conversion of arenes into their alkylated and fluoroalkylated derivatives in a single step at room temperature under nanoheterogeneous electrochemical conditions. Negligible oxidative leaching of silver from Ag0/+@SiO2 is recorded during the catalytic coupling of arenes with acetic, difluoroacetic and trifluoroacetic acids, which enables the good recyclability of the catalytic function of the Ag0/+@SiO2 nanostructure. The catalyst can be easily separated from the reaction mixture and reused a minimum of five times upon electrochemical regeneration. The use of the developed Ag0@SiO2 nano-architecture as a heterogeneous catalyst facilitates aromatic C-H bond substitution by alkyl and fluoroalkyl groups, which are privileged structural motifs in pharmaceuticals and agrochemicals.
2018
Silica-supported silver nanoparticles as an efficient catalyst for aromatic C-H alkylation and fluoroalkylation / Khrizanforov M.N.; Fedorenko S.V.; Mustafina A.R.; Kholin K.V.; Nizameev I.R.; Strekalova S.O.; Grinenko V.V.; Gryaznova T.V.; Zairov R.R.; Mazzaro R.; Morandi V.; Vomiero A.; Budnikova Y.H.. - In: DALTON TRANSACTIONS. - ISSN 1477-9226. - ELETTRONICO. - 47:29(2018), pp. 9608-9616. [10.1039/c8dt01090k]
Khrizanforov M.N.; Fedorenko S.V.; Mustafina A.R.; Kholin K.V.; Nizameev I.R.; Strekalova S.O.; Grinenko V.V.; Gryaznova T.V.; Zairov R.R.; Mazzaro R.; Morandi V.; Vomiero A.; Budnikova Y.H.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/878536
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