“…21,22 The presence of adaptive aromaticity is very useful and, for example, could help design the singlet fission materials. 20,23,24 It is worth noting that the origin of aromaticity should not be limited to the p-electron delocalization. In 1970s, Dewar first proposed the concept of s-aromaticity to rationalize the unusual magnetic behavior of cyclopropane based on the skeletal s-electrons.…”