Catalyst Recycling in Continuous Flow Reactors

This review summarizes the use of flow reactors, for the purpose of continuous catalyst separation and recycling in liquid‐phase fine chemistry organic transformations. An overview of the main separation strategies is provided, with a focus on cases where extended recycling of metal or metal‐free catalytic systems was demonstrated. Examples ranging from cross‐coupling and metathesis reactions to enantioselective transformations are discussed, trying to highlight the key factors towards the attainment of high total turnover number (TTON) and time on stream (TOS)