CAS :624-65-7 molecular weight : 74.51 colorless transparent oily liquid, do not dissolve in water, glycerol, and benzene, carbon tetrachloride, etc. Most of immiscible organic solvent, the combustible materials. The proportion of d = 1.0304, the melting point (mp) -76.9 ° C, the boiling point (bp) 56-57.1 ° C, and the flash point : 32.2 ° C to 35 ° C, refractive index : 1.4320. commonly used in organic synthesis, such as propargyl oxadiazon, acetylene grass herbicides Ester and other pesticides.