The Synthesis and Study of Polycyclic Aromatic Hydrocarbons

Di-2.3, 6.7-(peri-naphthylene)-naphthalene (I) and di-2.3, 6.7-(peri-naphthylene)-anthracene (II) were synthesised. Prom a study of the asymmetric annellation effects which are observed when two peri-naphthylene complexes are connected to benzene, naphthalene and anthracene, it has been concluded firstly, that during one of the annellations leading to a di-(peri-naphthylene)-acene the aromatic system of the central acene is extended to a system with two more rings, for example the aromatic system of benzene is extended to an anthracene system, and secondly, in the di-(peri-naphthylene)-acenes which are formally symmetric molecules there is an asymmetric distribution of pi-electrons