Scheme 1From: Edge-Functionalization of Pyrene as a Miniature Graphene via Friedel–Crafts Acylation Reaction in Poly(Phosphoric Acid) a The reaction between pyrene and TMPBA in poly(phosphoric acid)/phosphorous pentoxide at 130 °C; b proposed mechanism of a “direct” Friedel–Crafts acylation reaction between acylium ion (Ph–C+=O) of TMPBA and sp2C–H of pyreneBack to article page