Scheme 14.

Cycloaddition of diarylacetylenes to the perylene bay region: synthesis of 1,2-diarylbenzo[ghi]perylenes [152,154,155]. Reagents and conditions: (a) 10 eq. of perylene, solvent (Ph₂O) or excess of melted perylene, 280–300 °C, 0.001 Pa, 72 h, Y = up to 50%; Ar = see Figure 2.