Synthesis of Buta‐1,3‐diyne‐Bridged Macrocycles with (Z)‐1,4‐Diethynyl1,4‐dimethoxycyclohexa‐2,5‐diene as the Building Block

Abstract (Z)‐1,4‐Diethynyl‐1,4‐dimethoxycyclohexa‐2,5‐diene has been used as a building block for the synthesis of two novel macrocycles containing buta‐1,3‐diyne units as bridges. The tetrayne derivative 5c has been structurally characterized by single crystal X‐ray crystallographic data. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)