As an example of a novel class of glass‐forming liquid crystals, compound (I) was synthesized and characterized to possess a nematic mesophase betweenTgandTcas the pristine crystal was heated beyond itsTmfollowed by quenching to below room temperature. Differential scanning calorimetry (DSC) and x‐ray diffraction techniques were employed to investigate its morphological stability. It was found that the nematic mesophase persists upon annealing for a period of up to 22 h without the appearance of new phases. However, after annealing in the nematic regime over a longer period of time, thermally activated phase transformations were observed, resulting in a new crystalline phase plus the pristine crystalline phase based on DSC thermal transition data and x‐ray diffraction patterns. ©1995 American Institute of Physics.