68 research outputs found
General and Efficient C–C Bond Forming Photoredox Catalysis with Semiconductor Quantum Dots
Photoredox
catalysis has become an essential tool in organic synthesis
because it enables new routes to important molecules. However, the
best available molecular catalysts suffer from high catalyst loadings
and rely on precious metals. Here we show that colloidal nanocrystal
quantum dots (QDs) can serve as efficient and robust, precious-metal
free, photoassisted redox catalysts. A single-sized CdSe quantum dot
(3.0 ± 0.2 nm) can replace several different dye catalysts needed
for five different photoredox reactions (β-alkylation, β-aminoalkylation,
dehalogenation, amine arylation, and decarboxylative radical formation).
Even without optimization of the QDs or the reaction conditions, efficiencies
rivaling those of the best available metal dyes were obtained
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