Propanediol

Propanediol may refer to any of four isomeric organic chemical compounds:

Non-geminal diols (glycols) 1,2-Propanediol (propylene glycol), a vicinal diol 1,3-Propanediol (trimethylene glycol)

Geminal diols

1,1-Propanediol 2,2-Propanediol