Scheme 1. The proposed mechanism for Ir-catalysed photoredox amine synthesis in this work, adopted from ref. Starting with 1-morpholinocyclohexene (I), the first step, possibly during the reaction mixture preparation, is acid-catalysed iminium ion intermediate (Int-I) formation. Then, once visible light reaches the catalyst species, photocatalyst Ir(ppy)3 is excited, leading to the long-lived photoexcited [Ir(III)ppy3]* oxidant (1.9 µs lifetime), Reactions were conducted in a UV-150 reactor with a 470 nm LED lamp and a 6 bar BPR for the given residence time and temperature. An external chiller was used to achieve lower temperatures. The crude reaction was collected and 25 µL of this mixture was diluted to 1.0 mL in acetonitrile and analysed using HPLC. The experimental setup is given in Figure in the Electronic Supplementary Information (ESI) and full data generated in the optimisation is given in Table in the ESI.