1,2,3,4,5-Pentamethylcyclopentadiene is a cyclic dialkene with the formula C5Me5H (Me = CH3). 1,2,3,4,5-Pentamethylcyclopentadiene is the precursor to the ligand 1,2,3,4,5-pentamethylcyclopentadienyl, which is often denoted as Cp* (to signify the five methyl groups radiating from the periphery of this ligand as in a five-pointed star). In contrast to less substituted cyclopentadiene derivatives, Cp*H is not prone to dimerization.

CAS：4045-44-7
中文别名：五甲基环戊二烯;
英文别名：1,2,3,4,5-PentaMethylcyclopentadiene;1,2,3,4,5-Pentamethylcyclopenta-1,3-diene;1,2,3,4,5-pentamethylcyclopenta-1,3-diene;
分子式：C10H16
分子量：136.234
精确质量：136.125
Psa：0.0
Logp：3.3089

EINECS号：223-743-4
MDL号：MFCD00001354

外观与性状：无色液体
密度：0.87g/mLat 25°C(lit.)
沸点：58°C13mm Hg(lit.)
熔点：236ºC
闪点：112°F
折射率：n20/D 1.474(lit.)
稳定性：Stable at room temperature in closed containers under normal storage and handling conditions.
储存条件：-20ºC
蒸汽压：1.97mmHg at 25°C

安全说明：S16
WGK Germany：3
危险类别码：R10
海关编码：29021990
危险品运输编码：UN 3295 3/PG 3
危险类别：3
包装等级：III
危险品标志：Xn

用途
功能材料中间体。