From Serendipity to Precision: Decoding the Enigma of Rearrangement in Scholl-Type Reactions for Programmable Cyclization.

Rearrangements in the Scholl reaction have traditionally been serendipitous, lacking a systematic approach for synthesizing rearranged and cyclized products. This paper introduces a strategic pathway to achieve rearranged-cyclized thienotetrahelicene derivatives over direct-cyclized chrysenothiophene derivatives by finely modifying the reaction conditions and tuning the electronic properties in Scholl-type reaction precursors, tetraarylthiophenes. Through careful design principles, we demonstrate the programmable synthesis of these distinct products.