An efficient synthesis of liquid crystalline gigantocycles combining banana-shaped and rod-like mesogenic units

摘要

The synthesis of monodisperse giantocycles with 63,87,and 147 ring atomson the gram scale is described.These molecules were assembled from terphenylene derivatives and long,flexible chains which were mainly aliphatic,with terminal alkyne groups.The latter allowed for ring formation through oxidative akyne dimerizationin high yield (80-87%).The combination of a rod-like and a banana-shaped mesogen connected by flexible chains within the backbone of a ring gives rise to nematic and smectic mesophases.