Recent advances in the functionalization of azulene through Rh‐, Ir‐, Ru‐, Au‐, Fe‐, Ni‐, and Cu‐catalyzed reactions.

Due to their outstanding physicochemical features, azulene derivatives have been proposed for a wide range of prospective technical applications, including molecular switching, sensors, solar cells, and beneficial biological activities. Transition metal‐catalyzed cross‐coupling reactions are catalytic processes that create carbon–carbon bonds in one of the most straightforward and practical ways possible. These techniques have proven to be a very practical way to functionalize azulene. This study summarizes the progress made in this field by employing Rh, Ir, Ru, Au, Fe, Ni, and Cu catalysts over the last two decades. [ABSTRACT FROM AUTHOR]