Aliphatic compound
Aliphatic compounds in organic chemistry are saturated or unsaturated chains of carbon. Aliphatic molecules consist, generally, of a backbone of carbon atoms and other atoms bound to this carbon chain - most frequently hydrogen, oxygen, nitrogen, sulfur, and various halides.
The term "aliphatic" is used to distinguish such molecules from those deemed "aromatic" because of an aromatic ring structure (e.g., the benzene ring), in accordance with Hueckel's "2n+4" rule for ring valence
electrons, and to distinguish them from other "unsaturated" compounds which
contain carbon-carbon chemical bonds of an order higher than 1 (ie, those
compounds containing alkene or alkyne functional groups. The alkane series of hydrocarbons are aliphatic compounds.
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