In chemistry, 2,2,5,5-tetramethyltetrahydrofuran or 2,2,5,5-tetramethyloxolane is a heterocyclic compound with the formula C 8H 16O, or (CH3)2(C(CH2)2OC)(CH3)2. It can be seen as derivative of tetrahydrofuran (oxolane) with two methyl groups replacing two hydrogen atoms on each of the carbon atoms in the ring that are adjacent to the oxygen. It can be seen also as a cyclic ether of 2,5-dimethylhexane, an isomer of octane. It is sometimes denoted by the abbreviations TMTHF or Me4THF.

CAS：15045-43-9
中文别名：
英文别名：EINECS 239-117-9;Furan,tetrahydro-2,2,5,5-tetramethyl;2,2,5,5-TETRAMETHYLTETRAHYDROFURAN;2,2,5,5-tetramethyltetrahydrofurane;2,2,5,5-tetramethyldihydrofuran;Furan, tetrahydro-2,2,5,5-tetramethyl-;Tetrahydro-2,2,5,5-tetramethylfuran;2,2,5,5-tetramethylhydrofuran;
分子式：C8H16O
分子量：128.212
精确质量：128.12
Psa：9.23
Logp：2.354

EINECS号：239-117-9

外观与性状：透明无色
密度：0.811g/mLat 25°C(lit.)
沸点：112°C(lit.)
熔点：-92ºC
闪点：39°F
折射率：n20/D 1.405(lit.)
蒸汽压：26.1mmHg at 25°C

安全说明：S16-S29-S33
危险类别码：R11
WGK Germany：3
危险品运输编码：UN 1993 3/PG 2
海关编码：2932190090
危险类别：3
包装等级：II
危险品标志：F