2-Hydroxyethyl terephthalic acid

2-Hydroxyethyl terephthalic acid
Names
	Preferred IUPAC name 4-[(2-Hydroxyethoxy)carbonyl]benzoic acid
	Other names 1,4-Benzenedicarboxylic acid, 1-(2-hydroxyethyl) ester
Identifiers
CAS Number	1137-99-1 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:131735;
PubChem CID	174073;
UNII	8DN7KSY2WN ;
CompTox Dashboard (EPA)	DTXSID60622186 ;
	InChI InChI=1S/C10H10O5/c11-5-6-15-10(14)8-3-1-7(2-4-8)9(12)13/h1-4,11H,5-6H2,(H,12,13) Key: BCBHDSLDGBIFIX-UHFFFAOYSA-N;
	SMILES C1=CC(=CC=C1C(=O)O)C(=O)OCCO;
Properties
Chemical formula	C10H10O5
Molar mass	210.185 g·mol−1
Appearance	White solid
Melting point	183–186 °C (361–367 °F; 456–459 K)
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

2-Hydroxyethyl terephthalic acid is an organic compound with the formula HOC₂H₄O₂CC₆H₄CO₂H. It is the monoester of terephthalic acid and ethylene glycol. The compound is a precursor to poly(ethylene terephthalate) (PET), a polymer that is produced on a large scale industrially.^[1] 2-Hydroxyethyl terephthalic acid is a colorless solid that is soluble in water and polar organic solvents. Near neutral pH, 2-hydroxyethyl terephthalic acid converts to 2-hydroxyethyl terephthalate, HOC₂H₄O₂CC₆H₄CO₂⁻.

^ Sheehan, Richard J. (June 15, 2000). "Terephthalic Acid, Dimethyl Terephthalate, and Isophthalic Acid". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a26_193. ISBN 978-3527306732.

[Ullmann-1] Sheehan, Richard J. (June 15, 2000). "Terephthalic Acid, Dimethyl Terephthalate, and Isophthalic Acid". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a26_193. ISBN 978-3527306732.

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