Converting non-Mesogenic to Mesogenic Stacking of Amino--Triazine-Based Dendrons with -CN Phenyl Unit by Eliminating Peripheral Dipole.

Three new amino--triazine-based dendrons, , , and , containing an aryl-CN moiety in the dendritic skeleton were prepared in 72-81% yields (: R = - N(-CH), R = -OCH, : R = R = - N(-CH), : R = - N(-CH), R = - N(-CH)). Dendrons with N(-CH) and -OCH peripheral substituents, surprisingly, did not show any mesogenic phase during the thermal process. However, non-mesogenic can be converted to mesogenic or by eliminating the peripheral dipole arising from the alkoxy substituent; dendron only comprising the same N(-CH) peripheral groups showed a ~25 °C mesogenic range on heating and ~108 °C mesogenic range on cooling.