Methanediol

Methanediol
Names
	Preferred IUPAC name Methanediol
	Other names Formaldehyde hydrate; Formaldehyde monohydrate; Methylene glycol;
Identifiers
CAS Number	463-57-0 ;
3D model (JSmol)	Interactive image;
Abbreviations	MADOL
Beilstein Reference	1730798
ChEBI	CHEBI:48397 ;
ChemSpider	71348 ;
ECHA InfoCard	100.006.673
EC Number	207-339-5;
PubChem CID	79015;
UNII	6Z20YM9257 ;
CompTox Dashboard (EPA)	DTXSID50196801 ;
	InChI InChI=1S/CH4O2/c2-1-3/h2-3H,1H2 Key: CKFGINPQOCXMAZ-UHFFFAOYSA-N ;
	SMILES OCO;
Properties
Chemical formula	CH4O2
Molar mass	48.041 g·mol−1
Appearance	Colourless liquid
Density	1.199 g/cm3
Boiling point	194 °C (381 °F; 467 K) at 101 kPa
Vapor pressure	16.1 Pa
Acidity (pKa)	13.29
Refractive index (nD)	1.401
Hazards
Flash point	99.753 °C (211.555 °F; 372.903 K)
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Methanediol, also known as formaldehyde monohydrate or methylene glycol, is an organic compound with chemical formula CH₂(OH)₂. It is the simplest geminal diol. In aqueous solutions it coexists with oligomers (short polymers). The compound is closely related and convertible to the industrially significant derivatives paraformaldehyde ((CH₂O)_n), formaldehyde (H₂C=O), and 1,3,5-trioxane ((CH₂O)₃).

Methanediol is a product of the hydration of formaldehyde. The equilibrium constant for hydration is estimated to be 10³,CH₂(OH)₂ predominates in dilute (<0.1%) solution. In more concentrated solutions, it oligomerizes to HO(CH₂O)_nH.

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