Abstract Tetraazafulvalenes can be cross-coupled (palladium-catalyzed) with alkenes or acetylenes. Although Suzuki conditions fail, the Heck and the Sonogashira methods are useful tools for functionalizing tetraazafulvalenes. Starting from the tetraiodoaryl derivative 2b, four arylic iodine atoms could be replaced by acrylic acid esters, various styrenes or cylohexenes thus furnishing the new heterofulvalenes 4a-d. Under analogous conditions, ...
