Communication: Starburst oxadiazole glasses are obtained by the reaction of aromatic tetrazoles with acid chlorides. The synthesis and thermal properties of these novel compounds are described. One of the glasses-unlike the others, which recrystallize when heated above their glass-transition temperatures-is stable up to 350 degrees C and is thus the first example of a stable amorphous molecular material with oxadiazole units. Low molecular weight organic compounds that form stable glasses are of interest for applications as photoconductors or light-emitting devices.