“…This phenomenon causes a disruption to the π–π stacking behaviour of the PDI, which leads to improved solubility and altered physical properties 33, 37. Substitution of PDIs at the bay position is, however, synthetically demanding, involves halogenation reactions, and predominantly four‐fold bay‐substituted PDIs have been reported 35, 38, 39, 40, 41, 42, 43. Partly substituted 1,6‐ and 1,7‐regioisomers, commonly as mixtures,44, 45, 46, 47, 48 have also been synthesised,49, 50 while 1,12‐bay‐substituted PDIs have been rarely reported.…”