Open-chain compound In chemistry , an open-chain compound or acyclic compound is a compound with a linear structure , rather than a cyclic one. An open-chain compound having no side chains is called a straight-chain compound . Many of the simple molecules of organic chemistry , such as the alkanes and alkenes, have both linear and ring isomers, that is, both acyclic and cyclic, with the latter often classified as aromatic . For those with 4 or more carbons, the linear forms can have straight-chain or branched-chain isomers. The lowercase prefix n- denotes the straight-chain isomer ; for example, n -butane is straight-chain butane , whereas i -butane is isobutane . Cycloalkanes are isomers of alkenes, not of alkanes, because the ring's closure involves a C-C bond . Having no rings, all open-chain compounds are aliphatic . Typically in biochemistry , some isomers are more prevalent than others. For example, in living organisms, the open-chain isomer of glucose usually exists only transiently, in small amounts; D-glucose is the usual isomer; and L-glucose is rare . Straight-chain molecules are often not literally straight, in the sense that their bond angles are often not 180°, but the name reflects that they are schematically straight. For example, the straight-chain alkanes are wavy or "puckered", as the models below show . and mannose . Below the cyclic forms.
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