| Section2 = | Section4 = | Section7 =,,,, | SPhrases =,,,,,,, | FlashPt = 13 °C | Autoignition = 220 °C }} | Section8 = }} Octane's a straight-chain alkane with the chemical formula CH3(CH2)6CH3. Octane has 18 structural isomers: Octane (n-octane) 2-Methylheptane 3-Methylheptane 4-Methylheptane 3-Ethylhexane 2,2-Dimethylhexane 2,3-Dimethylhexane 2,4-Dimethylhexane 2,5-Dimethylhexane 3,3-Dimethylhexane 3,4-Dimethylhexane (meso compound) 3-Ethyl-2-methylpentane 3-Ethyl-3-m… (More on Octane)