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2 article(s) from Jacobi von Wangelin, Axel

A flow reactor setup for photochemistry of biphasic gas/liquid reactions

Josef Schachtner,
Patrick Bayer and
Axel Jacobi von Wangelin

Beilstein J. Org. Chem. 2016, 12, 1798–1811, doi:10.3762/bjoc.12.170

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Graphical Abstract

Figure 1: The challenge of mixing the three dispersed entities gas, liquid, and light for photochemical appli...

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Scheme 1: Mutual interdependencies of critical reaction and reactor parameters.

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Scheme 2: Blueprint of the home-built microflow photoreactor; schematic illustration of the reactor setup wit...

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Figure 2: Total absorbance of methylene blue solutions in acetonitrile according to the Beer-Lambert law: E_λ ...

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Figure 3: Red (λ_max = 633 nm), blue (λ_max = 448 nm), green (λ_max = 520 nm) and white (λ_max = 620 nm) LEDs mou...

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Figure 4: Overlap of absorption spectrum of methylene blue in acetonitrile and emission spectra of reasonably...

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Figure 5: Emission spectra of different LEDs; red (λ_max = 633 nm), blue (λ_max = 448 nm), green (λ_max = 520 nm...

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Scheme 3: Slug flow conditions of two-phase gas-liquid mixtures. Photograph of a slug flow of a solution of m...

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Figure 6: Photograph of the operating flow reactor, irradiated with white LEDs, filled with a solution of met...

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Scheme 4: Schematic illustration of a reactor tube (length l, inner diameter d) and pressure gradient Δp acco...

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Scheme 5: Reaction types of organic molecules with singlet oxygen.

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Figure 7: Home-made flow reactor and peripheral devices for photochemical reactions at light/liquid/gas inter...

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Scheme 6: Photooxygenation of N-methyl-1,2,3,6-tetrahydrophthalimide and reductive work-up to alcohol 3a.

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Figure 8: Conversion vs methylene blue sensitizer concentration. Reactions at constant flow rates in acetonit...

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Figure 9: Reaction progress at different residence times in flow and batch reactions. Flow: reactions at diff...

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Scheme 7: Oxidation of N-methyl-1,2,3,6-tetrahydro-3-acetamidophthalimide and reductive work-up to alcohol 3b....

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Published 11 Aug 2016

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On the mechanism of photocatalytic reactions with eosin Y

Michal Majek,
Fabiana Filace and
Axel Jacobi von Wangelin

Beilstein J. Org. Chem. 2014, 10, 981–989, doi:10.3762/bjoc.10.97

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Scheme 1: Oxidative quenching of eosin Y with arenediazonium salts and reactions of the resultant aryl radica...

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Scheme 2: Proposed general reaction mechanism of eosin Y-catalyzed substitutions with arene diazonium salts.

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Figure 1: UV–vis spectra of the photoborylation reaction mixture (RM).

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Figure 2: Fluorescence spectra of the photoborylation reaction mixture (RM). Ex. = excitation wavelength.

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Scheme 3: Acid–base behaviour of eosin Y.

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Figure 3: UV–vis spectrum of p-bromobenzenediazonium tetrafluoroborate (pBrPhN₂) and bispinacolato diboron (B₂...

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Scheme 4: Eosin Y-catalyzed and dye-free photolytic borylation.

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Scheme 5: Eosin Y-catalyzed and dye-free reactions with ethyl propiolate.

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Figure 4: UV–vis spectra of ortho-biphenyldiazonium tetrafluoroborate (biPhN₂) in acetonitrile.

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Scheme 6: Quantum yield determinations of selected visible-light-driven aromatic substitutions.

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Published 30 Apr 2014

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