Herein, we describe a continuous-flow system coupling a micro-flow photoreactor with OSN-based in-line TBADT recovery (Scheme 1D). The performance of photocatalytic HAT in the form of various photocatalytic C(sp 3 )-H alkylation reactions carried out with recycled TBADT (Scheme 2A) were investigated in conjunction with a two-stage OSN unit for the inline recovery of TBADT (Scheme 2B), proving the concept of scalable TBADT-based HAT transformations with low catalyst consumption and high turnover number (TON).