Abstract Treatment of pyrene and some its derivatives with Cu (II) tetrafluoroborate or perchlorate in CH 3 CN cleanly led to the formation of 1, 1′-dipyrenyls. The other polycyclic hydrocarbons (anthracene, perylene) under the same conditions provide cation-radicals. 1, 1′-Dipyrenyl strongly differs from pyrene in the chemical behavior: it does not undergo either formylation by Vilsmeier reaction, neither acylation (AcCl, ZnCl 2) or nitration (by ...
