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Butanediol Structural Isomers

Butanediol, also called Butylene Glycol, may refer to any one of four stable Structural Isomers:

• 1,2-Butanediol
• 1,3-Butanediol
• 1,4-Butanediol
• 2,3-Butanediol

Gem-Butanediols

There exists as well two Geminal Diols (Gem-diols), which are less stable:

• 1,1-Butanediol, hydrate of butanal
• 2,2-Butanediol, hydrate of butanone

Isobutylene Glycols

Isobutylene Glycol may be considered a kind of Butylene Glycol, similarly to Butane historically including n-Butane and Isobutane. The modern name for the closely related type of compounds is Methylpropanediol. There are two stable structural isomers:

• 2-Methylpropane-1,2-diol
• 2-Methylpropane-1,3-diol

and one unstable Geminal Diol:

• 2-Methylpropane-1,1-diol (not a glycol)

These three Methylpropanediols are Structural Isomers of Butanediols. They are not chiral.

Source: Wikipedia, Butanediol

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