Synthesis and structure of [2.2]paracyclophanes incorporating alkyne units in the extended linear chain

The novel [2.2]paracyclophanes 4-7 with an extended pi-conjugation due to the presence of a linear arylethynyl chain have been synthesized by the Pd-catalyzed Sonogashira coupling reaction. (c) 2005 Elsevier Ltd. All rights reserved.