Synthesis of Tripyreno[2,3,4-abc: 2,3,4-ghi: 2,3,4-mno][18]annulenes

Abstract

Synthesis of Tripyreno [2,3,4,-abc:2,3,4-ghi:2,3,4-mno][18]annulenes.-The synthesis and characterization of [18]annulenes which are condensed with three pyrene ring systems are presented. In a multi-step synthesis, the pyrene building block is generated first and in the final reaction step (IX) is formed in a threefold trans selective cyclocondensation process. The long alkyl side chains attached on the periphery of (IX) lead to the formation of liquid crystalline phases.