9-Crown-3

9-Crown-3
Names
	Preferred IUPAC name 1,4,7-Trioxonane
	Other names 1,4,7-Trioxacyclononane; Ethylene oxide trimer
Identifiers
CAS Number	27725-91-3;
3D model (JSmol)	Interactive image;
Beilstein Reference	1421638
ChEBI	CHEBI:32400;
ChemSpider	480221;
PubChem CID	552016;
CompTox Dashboard (EPA)	DTXSID70338923 ;
	InChI InChI=1S/C6H12O3/c1-2-8-5-6-9-4-3-7-1/h1-6H2 Key: RCIDBLLMZGGECJ-UHFFFAOYSA-N;
	SMILES C1COCCOCCO1;
Properties
Chemical formula	C6H12O3
Molar mass	132.159 g·mol−1
Appearance	Colorless liquid
Melting point	0 °C (32 °F; 273 K)
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

9-Crown-3, also called 1,4,7-trioxonane or 1,4,7-trioxacyclononane, is a crown ether with the formula (C₂H₄O)₃. A colorless liquid, it is obtained in low yield by the acid-catalyzed oligomerization of ethylene oxide.

In contrast to larger crown ethers (12-crown-4, and 18-crown-6), 9-crown-3 has elicited very little interest, except from theorists.