Recent advances in the chemistry of 2-metallanaphthalenes: 2-telluranaphthalene, 2-stibanaphthalene, 2-stannanaphthalene, 2-germanaphthalene and their analogues

The fusion of benzene with the c edge of 4H-telluropyran, 4H-stanine, 4H-stibinine or 4H-germine 2d motifs in hybrid configurations forms four distinct structures: condensed 2-telluranaphthalene, 2-stibanaphthalene, 2-stannanaphthalene and 2-germanaphthalene (2-metallanaphthalenes). 2-Metallanaphthalene (Metal= Te, Sb, Sn and Ge) is characterized by the presence of a Te, Sb, Sn and Ge atom in the second position instead of the first of 2-metallanaphthalene. To our knowledge, no reports have been published specifically on this scaffold, which has primarily been used as a building block. The synthesis of 2-telluranaphthalene, 2-stibanaphthalene, 2-stannanaphthalene or 2-germanaphthalene and their analogues can be achieved through various chemical pathways, including the Sonogashira coupling reactions, nucleophilic addition, organometallic reactions, metal substitution, and other methods.