2-Furyloxirane (FO) was polymerized by various anionic and coordination initiators both in bulk and solution. The corresponding polyethers had relatively low DPns (up to about 100) and possessed relatively irregular structures arising from propagation reactions involving both C alpha and C beta oxirane ring opening, except when aluminium isopropoxide was used as catalyst. The glass transition temperature (T-g) of these polymers was always lower than room temperature and approached 15 degrees C for the highest molecular weight. Propylene oxide did not copolymerize with FO, whereas butylene oxide gave copolymers, but the reactivity of FO remained much higher and the products were therefore rich in this comonomer unit.