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Propylene glycol (IUPAC name: propane-1,2-diol) is a viscous, colorless liquid. It is almost odorless and has a faintly sweet taste. Its chemical formula is CH 3 CH(OH)CH 2 OH. As it contains two alcohol groups, it is classified as a diol. An aliphatic diol may also be called a glycol.
The molecular formula C 3 H 8 O 2 may refer to: Dimethoxymethane; 2-Methoxyethanol; Propanediol. 1,2-Propanediol (propylene glycol), a vicinal diol; 1,3-Propanediol (trimethylene glycol) 1,1-Propanediol (geminal diol) 2,2-Propanediol (geminal diol)
Propanediol may refer to any of four isomeric organic chemical compounds: Non-geminal diols (glycols) 1,2-Propanediol, a.k.a. propylene glycol, a vicinal diol;
The systematic name of this enzyme class is propane-1,2-diol:NADP + oxidoreductase. Other names in common use include lactaldehyde (reduced nicotinamide adenine dinucleotide phosphate) , reductase , NADP + -1,2-propanediol dehydrogenase , propanediol dehydrogenase , 1,2-propanediol:NADP + oxidoreductase , and lactaldehyde reductase (NADPH) .
RC(O)CH 2 CH 2 OH + H 2 → RCH(OH)CH 2 CH 2 OH. 2,2-Disubstituted propane-1,3-diols are prepared in this way. Examples include 2-methyl-2-propyl-1,3-propanediol and neopentyl glycol. 1,3-Diols can be prepared by hydration of α,β-unsaturated ketones and aldehydes. The resulting keto-alcohol is hydrogenated.
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1,3-Propanediol is mainly produced by the hydration of acrolein. An alternative route involves the hydroformylation of ethylene oxide to form 3-hydroxypropionaldehyde. The aldehyde is subsequently hydrogenated to give 1,3-propanediol. Biotechnological routes are also known. [2] Two other routes involve bioprocessing by certain micro-organisms: