Alkanediol

An alkanediol, composed of alkane and diol, are a group of substances consisting of linear or branched hydrocarbon chains containing exactly two hydroxy groups at different positions.

They are a subgroup of the diols and contain no other heteroatoms or multiple bonds.

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Example of a 1,2-diol ( Ethyleneglycol , top),
a 1,3-diol ( 1,3-Propanediol , middle)
and a 1,4-diol ( 1,4-Butanediol , bottom).