Visible-light-induced, iridium catalyzed, para-selective C–H difluoroalkylation of aniline
derivatives under
mild reaction conditions is reported. Various substrates and bioactive
compounds, such as precursors of vorinostat and chlorpropham, were
all well tolerated. This protocol features a wide substrate scope,
high regioselectivity, low catalyst usage, and operational simplicity.
A Hexafluoroisopropanol-promoted highly regioselective Friedel-Crafts alkylation of arenes has been developed in this study. Various arenes, including anilides, anisoles, and phenols, were compatible with the reaction, leading to the para-alkylated...
A high-quality, heterogeneous hollow-fiber affinity membranes modified with mercapto was prepared through phase separation with blends of a chelating resin and polysulfone as membrane materials, poly(ethylene glycol) as an additive, N,N-dimethylacetamide as a solvent, and water as an extraction solvent. The effects of the blending ratio and chelating resin grain size on the structure of the hollow-fiber affinity membrane were studied. The effects of the composition of the spin-cast solution and process parameters of dry-wet spinning on the structure of the heterogeneous hollow-fiber affinity membrane were investigated. The pore size, porosity, and water flux of the hollow-fiber affinity membrane all decreased with an increase in the additive content, bore liquid, and dry-spinning distance. With an increase in the extrusion volume outflow, the external diameter, wall thickness, and porosity of the hollow-fiber affinity membrane all increased, but the pore size and water flux of the hollow-fiber affinity membrane decreased. It was also found that the effects of the internal coagulant composition and external coagulant composition on the structure of the heterogeneous hollow-fiber affinity membrane were different. The experimental results showed that thermal drawing could increase the mechanical properties of the heterogeneous hollow-fiber affinity membrane and decrease the pore size, porosity, and water flux of the heterogeneous hollowfiber affinity membrane, and the thermal treatment could increase the homogeneity and stability of the structure of the heterogeneous hollow-fiber affinity membrane.
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