RESUMO
Facile preparation of functional hydrogel materials for environmental catalysis is a hot research topic of soft materials science and green catalysis. In this study, a carboxylcellulose hydrogel confined Fe3O4 nanoparticles composite catalyst (Fe3O4@CHC) with magnetic recyclability has been synthesized by taking the advantages of the newly developed cellulose solution in tetramethyl guanidine/DMSO/CO2 through in situ acylation using mixed cyclic anhydrides and ion exchange reaction. The achieved Fe3O4@CHC hydrogel catalyst was shown to be an more efficient and better Fenton-like catalyst for decomposition of the organic dye rhodamine B (RhB) in the presence of hydrogen peroxide, with almost complete decomposition occurring within 180 min, in comparison with Fe3O4@cellulose hydrogel (CH) with excellent recyclability. This work provided a facile strategy for the preparation of hydrogel-based functional composite green catalytic materials, which has potential applications in green catalysis.
Assuntos
Celulose/química , Compostos Férricos/química , Hidrogéis/química , Nanopartículas de Magnetita/química , Rodaminas/química , Catálise , Celulose/síntese química , Hidrogéis/síntese química , Peróxido de Hidrogênio/química , Ferro/química , Ferro/metabolismo , Nanopartículas de Magnetita/ultraestrutura , Microscopia Eletrônica de Transmissão , Modelos Químicos , Estrutura Molecular , Oxirredução , Rodaminas/metabolismo , Espectroscopia de Infravermelho com Transformada de Fourier , Termogravimetria , Água/química , Difração de Raios XRESUMO
A general visible light induced direct difluoromethylation of N-methacryloyl benzamides by using difluoromethyl sulfone was developed. In addition, photoredox-catalyzed trifluoromethylation of N-methacryloyl benzamides with trifluoromethyl sulfone via a similar radical process was also achieved. This method allows for an efficient and practical synthesis of a variety of CF2H/CF3-containing isoquinoline-1,3(2H,4H)-diones in moderate to good yields. The reaction features mild reaction conditions, operational simplicity, and a broad substrate scope.
RESUMO
A mild and efficient method for the synthesis of 3-difluoroacetylated coumarins through visible-light-promoted aryldifluoroacetylation of alkynes with ethyl bromodifluoroacetate has been developed. The reaction allows the direct formation of Csp(2)-CF2COOEt and C-C bonds via a proposed tandem radical cyclization process.
Assuntos
Alcinos/química , Cumarínicos/síntese química , Fluoracetatos/química , Luz , Cumarínicos/química , Radicais Livres/química , Estrutura MolecularRESUMO
In the title compound, C(19)H(23)Cl(2)N(3)OS, the dihedral angle between the benzene ring and the pyrimidine ring is 86.6â (9)°. The piperidine ring adopts a chair conformation.