Aliphatic compound
In organic chemistry, hydrocarbons are divided into two classes: aromatic compounds and aliphatic compounds. Aliphatic compounds can be saturated like hexane, or unsaturated, like hexene and hexyne. Open-chain compounds, whether straight or branched, and which contain no rings of any type, are always aliphatic. Cyclic compounds can be aliphatic if they are not aromatic.
Structure
Aliphatic compounds can be saturated, joined by single bonds, or unsaturated, with double bonds or triple bonds. If other elements are bound to the carbon chain, the most common being oxygen, nitrogen, sulfur, and chlorine, it is no longer a hydrocarbon, and therefore no longer an aliphatic compound. However, such compounds may still be referred to as aliphatic if the hydrocarbon portion of the molecule is aliphatic, e.g. aliphatic amines, to differentiate them from aromatic amines.The least complex aliphatic compound is methane.
Properties
Most aliphatic compounds are flammable, allowing the use of hydrocarbons as fuel, such as methane in natural gas for stoves or heating; butane in torches and lighters; various aliphatic hydrocarbons in liquid transportation fuels like petrol/gasoline, diesel, and jet fuel; and other uses such as ethyne in welding.Examples
The most important aliphatic compounds are:Important examples of low-molecular aliphatic compounds can be found in the list below :
| Formula | Name | Structural formula | Chemical classification |
| Methane | Alkane | ||
| Acetylene | Alkyne | ||
| Ethylene | Alkene | ||
| Ethane | Alkane | ||
| Propadiene | Diene | ||
| Propyne | Alkyne | ||
| Propylene | Alkene | ||
| Propane | Alkane | ||
| 1,2-Butadiene | Diene | ||
| 1-Butyne | Alkyne | ||
| 1-Butene | Alkene | ||
| Butane | Alkane | ||
| Pentane | Alkane | ||
| Cyclohexene | Cycloalkene | ||
| Cyclohexane | Cycloalkane | ||
| Hexane | Alkane | ||
| Methylcyclohexane | Cycloalkane | ||
| Cubane | Prismane, Platonic hydrocarbon | ||
| Octane | Alkane | ||
| Dicyclopentadiene | Diene, Cycloalkene | ||
| Terpinene | Terpene, Diene, Cycloalkene | ||
| Phellandrene | Terpene, Diene, Cycloalkene | ||
| Limonene | Terpene, Diene, Cycloalkene | ||
| Decane | Alkane | ||
| Squalene | Terpene, Polyene | ||
| Polyethylene | Alkane |