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general/alkanediols

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Butanediol


Butanediol, also called butylene glycol, may refer to any one of four stable structural isomers:

Geminal diols

There are also two geminal diols (gem-diols), which are less stable:

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

Isobutylene glycol and methylpropanediol

Isobutylene glycol may be considered a kind of butylene glycol, similarly to butane historically including n-butane and i-butane (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), hydrate of 2-methylpropanal (isobutyraldehyde) These three methylpropanediols are structural isomers of butanediols. They are not chiral.

Examples

2-Methylpropane-1,3-diol derivatives:

References

References

  1. "Butanediol". PubChem.
  2. "Propanediol, methyl-". PubChem.
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