Expanding the BN‐Embedded PAH Family: 4a-aza-12a-borachrysene

Previously unknown 4a-aza-12a-borachrysene has been synthesized in only four steps. The reactions of this BN-embedded PAH with bromine and organolithium compounds proceed with complete regioselectivity, resulting in the formation of interesting derivatives. One of these, namely the phenylalkynyl-substituted derivative, exhibits a remarkably high fluorescence quantum yield (φF = 0.68).