Name | cyclopentadiene |
Synonyms | pentole r-pentine JACS-542-92-7 pyropentylene cyclopentadiene Cyclopentadiene 1,3-Cyclopentadiene 2,4-Cyclopentadiene cyclopenta-1,3-diene |
CAS | 542-92-7 |
EINECS | 208-835-4 |
InChI | InChI=1/C5H6/c1-2-4-5-3-1/h1-4H,5H2 |
Molecular Formula | C5H6 |
Molar Mass | 66.1 |
Density | d40 0.8235; d410 0.8131; d420 0.8021; d425 0.7966; d430 0.7914 |
Melting Point | -85°; mp 32.5° |
Boling Point | bp760 41.5-42.0° |
Water Solubility | 10.3 mM at 25 °C (shake flask-UV spectrophotometry, Streitwieser and Nebenzahl, 1976) |
Solubility | Miscible with acetone, benzene, carbon tetrachloride, and ether. Soluble in acetic acid, aniline, andcarbon disulfide (Windholz et al., 1983). |
Vapor Presure | 381 at 20.6 °C, 735 at 40.6 °C, 1,380 at 60.9 °C (Stoeck and Roscher, 1977) |
Appearance | Colorless liquid |
Exposure Limit | TLV-TWA 75 ppm (~202 mg/m3) (ACGIH,NIOSH, and OSHA); IDLH 2000 ppm(NIOSH). |
pKa | 16(at 25℃) |
Stability | Stable at room temperature. Incompatible with oxidizing agents, acids and a wide variety of other compounds. May form peroxides in storage. May undergo spontaneous polymerisation.Decomposes on heating |
Refractive Index | nD16 1.44632 |
Physical and Chemical Properties | This product is a colorless liquid, M.P.-97.2 ℃, B. P. 40 ℃,n20D 1.4446, relative density 0.805 (19/4 ℃), miscible with alcohol, ether, benzene and carbon tetrachloride, soluble in carbon disulfide, aniline, acetic acid and liquid paraffin, insoluble in water. The polymerization was carried out at room temperature to produce dicyclopentadiene. cyclopentadiene dimer, M.P. -1 ℃, B. P. 170 ℃,n20D 1.1510, relative density 0.986. Cyclopentadiene is typically present as a dimer. |
UN IDs | 1993 |
Hazard Class | 3.2 |
Packing Group | III |
Toxicity | LD50 of dimer orally in rats: 0.82 g/kg (Smyth) |
colorless liquid, flammable and highly volatile, similar to the smell of terpene. Melting Point -85 °c, boiling point 41.5 °c. The relative density is 0.8024 and the refractive index is 1. 4429. Spontaneous ignition point 640 °c (in air). Insoluble in water, soluble in ethanol, ether, benzene, acetone, carbon tetrachloride and other organic solvents. Because it contains two double bonds and an active methylene group, the nature is very active. It is also easy to polymerize into dicyclopentadiene at normal temperature, but it can still be converted into cyclopentadiene by heating (176.6 to 190 ° C.). The heat of evaporation of monomeric cyclopentadiene was 354 719 5J/mol.
mainly used in the manufacture of Diene pesticides, plastics, coatings, pharmaceuticals, spices, synthetic rubber, petroleum resins, high-energy fuels.