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Search for "photoredox catalyst" in Full Text gives 57 result(s) in Beilstein Journal of Organic Chemistry.
An improved procedure for the preparation of Ru(bpz)3(PF6)2 via a high-yielding synthesis of 2,2’-bipyrazine
Beilstein J. Org. Chem. 2015, 11, 61–65, doi:10.3762/bjoc.11.9
- . Moreover, the yields on larger scales were unreliable, and work-up and purification of this inefficient coupling reaction proved difficult. Thus, in order to accelerate our investigations of complex 2 as a strongly oxidizing photoredox catalyst, we required a robust, high-yielding, and scalable synthesis
Visible-light-induced bromoetherification of alkenols for the synthesis of β-bromotetrahydrofurans and -tetrahydropyrans
Beilstein J. Org. Chem. 2015, 11, 31–36, doi:10.3762/bjoc.11.5
- reported that visible-light-induced photoredox catalysis could serve as a more environmental-friendly alternative reaction system to obtain Br2 in situ from CBr4, an oxidative quencher of photoredox catalyst [16][17][18][19][20][21][22]. Thus, as part of difunctionalization of alkenes, with our continuous
Visible light photoredox-catalyzed deoxygenation of alcohols
Beilstein J. Org. Chem. 2014, 10, 2157–2165, doi:10.3762/bjoc.10.223
- = 2-phenylpyridine) as photoredox catalyst (Scheme 1) [10]. This protocol is applicable to a broad range of alcohols. It also greatly advanced the quest to develop sustainable methods for the deoxygenation of alcohols. Yet, several redox steps, i.e., the stoichiometric transformation of
Cyclization–endoperoxidation cascade reactions of dienes mediated by a pyrylium photoredox catalyst
Beilstein J. Org. Chem. 2014, 10, 1272–1281, doi:10.3762/bjoc.10.128
Direct C–H trifluoromethylation of di- and trisubstituted alkenes by photoredox catalysis
Beilstein J. Org. Chem. 2014, 10, 1099–1106, doi:10.3762/bjoc.10.108
- examination of photocatalytic trifluoromethylation of 1,1-diphenylethene 2a with 1 equivalent of Umemoto’s reagent 1a in the presence of 5 mol % fac-Ir(ppy)3, a photoredox catalyst, and 2 equivalents of K2HPO4, a base, in [D6]-DMSO under visible light irradiation (blue LEDs: λmax = 425 nm) for 2 h. As a
- absence of photocatalyst (Table 1, entries 9 and 10), strongly supporting that the photoexcited species of the photoredox catalyst play key roles in the reaction. The scope and limitations of the present photocatalytic trifluoromethylation of alkenes are summarized in Table 2. 1,1-Diphenylethenes with
Visible-light photoredox catalysis enabled bromination of phenols and alkenes
Beilstein J. Org. Chem. 2014, 10, 622–627, doi:10.3762/bjoc.10.53
- of phenols and alkenes has been developed utilizing visible light-induced photoredox catalysis. The bromine was generated in situ from the oxidation of Br− by Ru(bpy)33+, both of which resulted from the oxidative quenching process. Keywords: alkenes; bromination; phenols; photoredox catalyst
- obtained in 78% yield (Table 1, entry 1), whereas 3-bromo-4-methoxyphenol was not observed. The optimization of the reaction conditions were conducted by screening selected solvents and the amount of the photoredox catalyst using 1a as the representative substrate. As can be seen in Table 1, the solvent
- . The stereochemistry of the bromofuran compound was determined by 2D NMR spectra. Conclusion In summary, we have developed a mild and operationally simple method for the in situ preparation of bromine utilizing a visible-light photoredox catalyst. The reaction proceeds with high chemical yield and
Regioselective 1,4-trifluoromethylation of α,β-unsaturated ketones via a S-(trifluoromethyl)diphenylsulfonium salts/copper system
Beilstein J. Org. Chem. 2013, 9, 2189–2193, doi:10.3762/bjoc.9.257
- chalcones. During the preparation of this article, the Nicewicz group showed a single example of conjugate trifluoromethylation of chalcone with sodium trifluoromethanesulfinate salt in the presence of N-methyl-9-mesitylacridinium as a photoredox catalyst resulting in a low product yield of 31% as a mixture
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