ABSTRACT
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.
Subject(s)
Cellulose/chemistry , Ferric Compounds/chemistry , Hydrogels/chemistry , Magnetite Nanoparticles/chemistry , Rhodamines/chemistry , Catalysis , Cellulose/chemical synthesis , Hydrogels/chemical synthesis , Hydrogen Peroxide/chemistry , Iron/chemistry , Iron/metabolism , Magnetite Nanoparticles/ultrastructure , Microscopy, Electron, Transmission , Models, Chemical , Molecular Structure , Oxidation-Reduction , Rhodamines/metabolism , Spectroscopy, Fourier Transform Infrared , Thermogravimetry , Water/chemistry , X-Ray DiffractionABSTRACT
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.
ABSTRACT
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.
Subject(s)
Alkynes/chemistry , Coumarins/chemical synthesis , Fluoroacetates/chemistry , Light , Coumarins/chemistry , Free Radicals/chemistry , Molecular StructureABSTRACT
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.
