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Blue light mediated C-H arylation of heteroarenes using TiO2 as an immobilized photocatalyst in a continuous-flow microreactor

: Fabry, David; Ho, Yee Ann; Zapf, Ralf; Tremel, Wolfgang; Panthöfer, Martin; Rueping, Magnus; Rehm, Thomas H.

Volltext ()

Green chemistry 19 (2017), Nr.8, S.1911-1918
ISSN: 1463-9262
ISSN: 1463-9270
European Commission EC
FP7-IDEAS; 617044; SunCatChem
Sustainable Light - Driven Catalytic Chemistry
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer ICT-IMM ( IMM) ()
photocatalysis; continuous flow; microreactor

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.