Titanium dioxide was applied as an immobilized photocatalyst in a microstructured falling film reactor for the continuous-flow C-H arylation of heteroarenes with aryldiazonium salts as the starting material. Detailed investigations of the catalyst and a successful long-term run proved its excellent usability for this process. Very good yields up to 99% were achieved with broad substrate scope and were compared with batch synthesis. The transfer to the continuous-flow mode revealed an impressive boost in reactor performance solely resulting from the improved irradiation and contact of the catalyst, substrate and light.
Bibliographical noteFunding Information:
T. H. R. would like to thank Dr Raphael Thiermann for TEM analysis, Anja Himmelsbach for SEM and EDX analysis and Gitta Hasert for nitrogen physisorption analysis (all Fraunhofer ICT-IMM). This research has received funding from the European Research Council under the European Union's Seventh Framework Programme (FP/2007-2013)/ERC Grant Agreement no. 617044 (SunCatChem).
© 2017 The Royal Society of Chemistry.
ASJC Scopus subject areas
- Environmental Chemistry