“…In this context, boraphenalene stands as a representative example of boron-doped polycyclic odd-alternant hydrocarbons, displaying an isoelectronic structure with a phenalenyl cation . Despite theoretical calculations predicting its electronic structure, including aromaticity/antiaromaticity, pancake π–π bonding, and singlet–triplet gap, the construction of boraphenalene skeletons remains challenging except for nitrogen incorporating boraphenalenes . Among the boraphenalenes, categorized into four types ( A – D ) based on the doping position of boron, type- B compounds (1-boraphenalene) have been independently reported by several research groups (Figure a) .…”