Our optimization efforts commenced by reacting aryl bromide 1 with propane, employing a synergistic combination of Ni complex I and tetrabutylammonium decatungstate (TBADT) as the Hydrogen Atom Transfer photocatalyst. CD3CN was selected as the solvent due to TBADT's well-known propensity to abstract hydrogen atoms from CH3CN under the demanding conditions necessary to activate gaseous reagents. A gas-to-liquid ratio (G:L) of 20:1 (8 equiv.) was employed, with 2,6-lutidine used to quench the hydrobromic acid formed during the reaction. The solution was introduced into a continuous-flow microreactor (ID = 0.5 mm; 5 mL volume) and irradiated with UV-A light (Chip-on-board LED, λ = 365 nm; 144 W optical power) (See Supplementary Information, Section 2.3). By utilizing a back pressure regulator, we were able to elevate the reaction pressure to 32 bar, effectively liquefying the gaseous alkanes and thereby enhancing the probability of their activation through photocatalytic HAT. Under these conditions, a residence time of only 15 minutes (entry 1) was found to be sufficient for detecting the formation of the desired product 2 in a synthetically useful yield with a regioisomeric mixture of 2:1 (2a:2b). Extending the residence time to 30 minutes (entry 2) did not have a positive impact on the chemical efficiency. However, increasing the G:L to 40:1 (16 equiv.), and 60:1 (24 equiv.), (entries 3 and 4, respectively)