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HetABs by Fuchter[ 15 , 20 ] (1–3) and Wegner, Dreuw, Wachtveitl (4). [21] Azopyrrole 2 as well as thiophenylazo 4 a form T‐shaped Z isomers, that are stabilized by CH⋅⋅⋅π and lone pair⋅⋅⋅π interactions, respectively. In contrast, azopyrrole 3 cannot adopt a T‐shaped (Z) isomer due to methyl substitution.
