Properties: Liquid. d40 0.8235; d410 0.8131; d420 0.8021; d425 0.7966; d430 0.7914. mp -85°. bp760 41.5-42.0°. nD16 1.44632. Absorption spectum: Pickett et al., J. Am. Chem. Soc.
63, 1073 (1941). Insol in water. Miscible with alc, ether, benzene, carbon tetrachloride. Sol in carbon disulfide, aniline, acetic acid, liquid petrolatum. Cyclopentadiene polymerizes to dicyclopentadiene on standing. Polymerization is accelerated by the presence of peroxides or trichloroacetic acid. The dimer is cryst, mp 32.5°, with a camphor-like odor, having the structure of a partially hydrogenated indene contg a bridged methylene group. It is a more convenient form in which to handle cyclopentadiene, and is easily depolymerized by distilling at atmospheric pressure. LD50 of dimer orally in rats: 0.82 g/kg (Smyth).
Melting point: mp -85°; mp 32.5°
Boiling point: bp760 41.5-42.0°
Index of refraction: nD16 1.44632
Density: d40 0.8235; d410 0.8131; d420 0.8021; d425 0.7966; d430 0.7914
Toxicity data: LD50 of dimer orally in rats: 0.82 g/kg (Smyth)
CAUTION: Potential symptoms of overexposure are irritation of eyes and nose. See NIOSH Pocket Guide to Chemical Hazards (DHHS/NIOSH 97-140, 1997) p 86.
Use: Manuf resins; in organic synthesis as the diene in the Diels-Alder reaction producing sesquiterpenes, synthetic alkaloids, camphors.
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