Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 20, Issue 45, Pages 14624-14628Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201404440
Keywords
carbon nitride; continuous flow; heterogeneous catalysis; photocatalysis; radical reactions
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Funding
- Light2Hydrogen Project of the BMBF [03IS2071D]
- Alexander von Humboldt Foundation
- Federal Ministry for Education and Research (Germany)
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Mesoporous graphitic carbon nitride (mpg-C3N4) was found to be an efficient heterogeneous photocatalyst for the metal-free radical cyclization of 2-bromo-1,3-dicarbonyl compounds. Reactions leading to functionalized cyclopentanes proceed under mild conditions and can be conducted in a continuous flow photoreactor. Compared to the batch reaction, the use of a continuous flow reactor resulted in a significant reduction in reaction time (complete conversion of 0.04mmol of substrate in a batch was achieved after 4h, whereas in a flow reactor the same amount of substrate was fully converted into a product within 40min). Mechanistic studies of the reaction showed that THF plays not only the role of solvent, but is also a crucial hydrogen and electron donor.
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