Polycyclic Arenes and Heteroarenes: Synthesis, Properties, and Applications - Google Books

https://books.google.de/books?id=ZY6ECgAAQBAJ&pg=PA123#v=onepage

Graphene, a giant molecule containing carbon atoms packed in a honeycomb lattice, is an extreme case of the compound class known as polycyclic arenes. Introduction of hetero-atoms, such as B and N, to the _-backbones of polycyclic arenes results in…