ABSTRACT The fusion of two selenophene ring systems results in five distinct structural types: condensed selenopheno2,3‐ b selenophene, selenopheno3,4‐ b selenophene, 1 H ,4 H ‐selenopheno3,4‐ c selenophene, 1 H ,3 H ‐selenopheno3,4‐ c selenophene, and selenopheno3,2‐ b selenophene. Despite their potential, no dedicated studies have exclusively explored this scaffold, which has primarily been employed as a versatile building block across various applications. The synthesis of selenopheno2,3‐ b &3,4‐ b &3,4‐ c selenophene and their analogs can be achieved through diverse chemical approaches, including (i) selenation reactions, (ii) Thorpe–Ziegler cyclization, (iii) Stille and Sonogashira coupling, (iv) McMurry cyclization, and (v) Photocyclization reactions, among other methods.
Elsharkawy et al. (2025) studied this question.