“…[1][2][3][4][5][6][7][8][9][10][11][12] With an increasei nt he orbitals ize of the chalcogens (O 2p, S3p, Se 4p, and Te 5p), the stability of the corresponding ketones gradually decreases owing to improper orbitalo verlap with carbon (C 2p). [13] Rationally,e xamples of chalcogenone monomers progressivelyd ecrease from Ot oT e. As am atter of fact, monomeric tellurones are extremelyr are, [14,15] whereas similar oxonesa nd thionesa re quite common in nature and in synthesis laboratories.…”