Heterogeneous Photocatalysis in Organic Synthesis

Gisbertz, Sebastian; Pieber, Bartholomäus

doi:10.1002/cptc.202000014

Cited by 212 publications

(144 citation statements)

References 133 publications

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“…Most photocatalytic reactions, including the examples described earlier, rely on a small set of PCs, such as homogeneous iridium or ruthenium polypyridyl complexes ( Arias-Rotondo and McCusker, 2016 ), a few organic dyes ( Romero and Nicewicz, 2016 ), and some semiconducting materials ( Gisbertz and Pieber, 2020 ) with suitable redox potentials or triplet energies, and long-lived excited states. One of the main drawbacks of these PCs is their limitation to highly energetic visible light ( Figure 3 ) ( Prier et al., 2013 ).…”

Section: The Wavelength Mattersmentioning

confidence: 99%

Emerging concepts in photocatalytic organic synthesis

2021

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Summary Visible light photocatalysis has become a powerful tool in organic synthesis that uses photons as traceless, sustainable reagents. Most of the activities in the field focus on the development of new reactions via common photoredox cycles, but recently a number of exciting new concepts and strategies entered less charted territories. We survey approaches that enable the use of longer wavelengths and show that the wavelength and intensity of photons are import parameters that enable tuning of the reactivity of a photocatalyst to control or change the selectivity of chemical reactions. In addition, we discuss recent efforts to substitute strong reductants, such as elemental lithium and sodium, by light and technological advances in the field.

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Section: The Wavelength Mattersmentioning

confidence: 99%

Emerging concepts in photocatalytic organic synthesis

2021

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“…Heterogeneous photocatalysts based on metal oxide semiconductors have demonstrated high efficiency in carrying out a great variety of organic transformations 7 , 8 . In this regard, bismuth(III)oxide is a cheap and narrow bandgap metal oxide semiconductor ( E g = 2.1 to 2.8 eV) that presents useful photocatalytic activity.…”

Section: Introductionmentioning

confidence: 99%

Shedding light on the nature of the catalytically active species in photocatalytic reactions using Bi2O3 semiconductor

et al. 2021

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The importance of discovering the true catalytically active species involved in photocatalytic systems allows for a better and more general understanding of photocatalytic processes, which eventually may help to improve their efficiency. Bi2O3 has been used as a heterogeneous photocatalyst and is able to catalyze several synthetically important visible-light-driven organic transformations. However, insight into the operative catalyst involved in the photocatalytic process is hitherto missing. Herein, we show through a combination of theoretical and experimental studies that the perceived heterogeneous photocatalysis with Bi2O3 in the presence of alkyl bromides involves a homogeneous BinBrm species, which is the true photocatalyst operative in the reaction. Hence, Bi2O3 can be regarded as a precatalyst which is slowly converted in an active homogeneous photocatalyst. This work can also be of importance to mechanistic studies involving other semiconductor-based photocatalytic processes.

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“…The significant advances have been obtained in a variety of photochemical reactions with the semiconductor‐based catalysts, particularly water splitting, CO 2 reduction, pollutant degradation and organic transformation. [ 24,25 ] Nevertheless few studies related to inorganic‐semiconductor‐involving heterogeneous asymmetric photocatalysis have been reported.…”

Section: Inorganic Semiconductorsmentioning

confidence: 99%

Applications of Nanomaterials in Asymmetric Photocatalysis: Recent Progress, Challenges, and Opportunities

et al. 2020

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Asymmetric catalysis is one of the most attractive strategies to obtain important enantiomerically pure chemicals with high quality and production. In addition, thanks to the abundant and sustainable advantages of solar energy, photocatalysis possesses great potential in environmentally benign reactions. Undoubtedly, asymmetric photocatalysis meets the strict demand of modern chemistry: environmentally friendly and energy‐sustainable alternatives. Compared with homogeneous asymmetric photocatalysis, heterogeneous catalysis has features of easy separation, recovery, and reuse merits, thus being cost‐ and time‐effective. Herein, the state‐of‐the‐art progress in asymmetric photocatalysis by heterogeneous nanomaterials is addressed. The discussion comprises two sections based on the type of nanomaterials: typical inorganic semiconductors like TiO2 and quantum dots and emerging porous materials including metal–organic frameworks, porous organic polymers, and organic cages. Finally, the challenges and future developments of heterogeneous asymmetric photocatalysis are proposed.

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Heterogeneous Photocatalysis in Organic Synthesis

Cited by 212 publications

References 133 publications

Emerging concepts in photocatalytic organic synthesis

Emerging concepts in photocatalytic organic synthesis

Shedding light on the nature of the catalytically active species in photocatalytic reactions using Bi2O3 semiconductor

Applications of Nanomaterials in Asymmetric Photocatalysis: Recent Progress, Challenges, and Opportunities

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