A novel enantioselective protonation
protocol that is triggered
by reductive cross coupling of olefins is reported. When under cooperative
photoredox and chiral hydrogen-bonding catalytic conditions and using
a terminal reductant, various α-branched vinylketones with diverse
vinylazaarenes could provide important enantioenriched azaarene derivatives
containing tertiary stereocenters at their remote δ-position
with high yields and enantioselectivities. This reaction system is
also suitable for α-branched vinylazaarenes, thus successfully
assembling elusive 1,4-stereocenters. The convenient late-stage modifications
of products, especially the formation of remote ε-tertiary and
ε-heteroquaternary carbon stereocenters, further highlight the
important synthetic value of this method. Control experiments and
density functional theory (DFT) calculations were conducted to elucidate
the plausible reaction mechanism and origins of regioselectivity and
stereoselectivity.
Bismuth ferrite-based heterojunction composites have been considered as promising visible-light responsive photocatalysts because of their narrow band gap structure; however, the synthetic methods reported in the literature were usually time-consuming. In this study, we report a facile and quick preparation of bismuth ferrite-based composites by the hydrothermal method, combined with spark plasma sintering (SPS), a technique that is usually used for the high-speed consolidation of powders. The result demonstrated that the SPS-assisted synthesized samples possess significant enhanced photoelectric and photocatalytic performance. Specifically, the SPS650 (sintered at the 650 °C for 5 min by SPS) exhibits a 1.5 times enhancement in the photocurrent density and a 3.8 times enhancement in the tetracycline hydrochloride photodegradation activity than the unmodified bismuth ferrite samples. The possible influence factors of SPS on photoelectric and photocatalytic performance of bismuth ferrite-based composites were discussed carefully. This study provides a feasible method for the facile and quick synthesis of a highly active bismuth ferrite-based visible-light-driven photocatalyst for practical applications.
It’s smart heterogeneous structure and rational photocatalyst design that play an important role in photocatalytic hydrogen production. In this study, ZnIn2S4 (ZIS) nanosheets are growing in-situ on the surface of...
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