We assembled a set of 28 diverse substrates (Figure ) that was inspired by known classes of substrates for photocatalytic reactions. These reactions included photoredoxcatalysed dehydrogenative couplings (e.g. hetarene + hydrogen donor) and hydroaminations (e.g. alkene + nitrogen nucleophile). The set thus included a diverse range of hetarenes (S1-S14, S18, S21 and S25), amines (S1, S3 and S6), anilines (S2 and S7), alkenes (S15-S21) and (partially) saturated heterocycles with at least one CH bond  to nitrogen (S19, S20 and S22-S28). In each reaction, a pair of substrates was explored: a limiting substrate and a second substrate in three-fold excess. We also decided to allow variation of the reagents used: reactions could be performed with 2,4,6triisopropylbenzenethiol (TRIP-thiol) (which can promote hydrogen atom transfer ), tertbutyl peroxyacetate (TBPA, an oxidant) or no additive; and with or without TFA. There was therefore a total of 4536 possible reactions (28 limiting substrates x 27 substrates used in excess x 6 reaction conditions) that could potentially be explored.