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1. Introduction The current enthusiasm for photochemistry can be partially attributed to the booming interest of the synthetic community in photoredox catalysis. Photoredox catalysis has enabled nontraditional reaction

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Journal of Flow Chemistry
Authors: Natan Straathof, Dannie Osch, Arian Schouten, Xiao Wang, Jaap Schouten, Volker Hessel, and Timothy Noël

A visible light photocatalytic metal-free perfluoroalkylation method for the functionalization of heteroarenes in continuous flow was developed. Eosin Y was the most efficient photocatalyst with regard to substrate scope, reaction time and cost prize. Faster reaction times were observed in continuous flow compared to batch due to an improved irradiation of the reaction mixture on a microscale. Several pyrroles and indoles were perfluoroalkylated within 30 min residence time (six examples). The trifluoromethylation of pyrroles and indoles was achieved by using a gas–liquid flow with CF3I as a cheap CF3 source (three examples).

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– 1185 . “ Rapid trifluoromethylation and perfluoroalkylation of five-membered heterocycles by photoredox catalysis in continuous flow ” N. J. W. Straathof , H. P. L. Gemoets , X. Wang , J. C. Schouten , V. Hessel , T. Noël

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, 31 , 22 – 25 . “ Smart enzyme immobilization in microstructured reactors ” J. M. Bolivar , B. Nidetzky Chemistry Today 2013 , 31 ( 3 ), 50 – 54 . “ Accelerating photoredox catalysis in

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. Reviews: “Recent advances in asymmetric catalysis in flow” D. Zhao ,* K. , Ding * ACS Catalysis 2013 , 3 , 928 – 944 . “Accelerating photoredox catalysis in continuous microflow” T. Noël, X. Wang

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. “ Application of microflow conditions to visible light photoredox catalysis ” M. Neumann , K. Zeitler * Organic Letters 2012 , 14 , 2658 – 2661 . “ A flow-based synthesis of 2-aminoadamantane-2-carboxylic acid ” C. Battilocchio

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Organic & Biomolecular Chemistry 2015 , 13 , 9528 – 9550 “ Visible-light photoredox catalysis: direct synthesis of fused ¦Â-carbolines through an oxidation/[3 + 2] cycloaddition/oxidative aromatization reaction cascade in batch

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