This cycloalkene, also known as COT, presents as a pale yellow to deep yellow liquid. It is known to be very soluble in ether, benzene, and ethanol. Store in an explosion-poof refrigerator. This substance is heat sensitive and light sensitive. 1,3,5,7-Cyclooctatetraene is incompatible with oxidizing agents. This chemical is highly flammable in liquid and vapor form.