Hexamethylene glycol; 1,6-Dihydroxyhexane; 1,6-Hexylene glycol; Hexamethylenediol; HDO
|Molar mass||118.17 g·mol−1|
|Melting point||42 °C (108 °F; 315 K)|
|Boiling point||208 °C (406 °F; 481 K)|
|Solubility||soluble in ethanol and acetone, slightly soluble in diethyl ether, insoluble in benzene.|
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
|what is: / ?)(|
1,6-Hexanediol (HOCH2(CH2)4CH2OH) is a colorless crystalline solid that melts at 42 °C and boils at 250 °C. It is soluble in water and is hygroscopic.
1,6-Hexanediol is prepared industrially by the hydrogenation of adipic acid. Laboratory synthesis can be done by reduction of adipic acid with lithium aluminium hydride, however, since it is cheaply and commercially available, it is usually not synthesized in the laboratory.
Dehydration of 1,6-hexanediol gives oxepane, 2-methyltetrahydropyran and 2-ethyltetrahydrofuran. Corresponding thiophene and pyrrolidone can be made by reacting 1,6-hexanediol with hydrogen sulfide and ammonia respectively.
A vast number of monocarboxylic and dicarboxylic esters have been reported, which this reaction is used to synthesize unsaturated polyester resins and polyesters. Polycarbonates can be made from reaction with 1,6-hexanediol with phosgene.
1,6-Hexandiol can improve the hardness and flexibility of polyesters as it contains a fairly long hydrocarbon chain. In polyurethanes, it is used as a chain extender, and the resulting modified polyurethane has high resistance to hydrolysis as well as mechanical strength, but with a low glass transition temperature.
1,6-Hexanediol has low toxicity and low flammability, and is generally considered as safe. It is not irritating to skin, but may irritate the respiratory tract or mucous membranes. Dust or vapor of the compound can irritate or damage the eyes.
|This article needs additional citations for verification. (June 2011)|
- Chemicals and reagents 2008-2010, Merck
- CRC Handbook of Chemistry and Physics, 87th Edition
- BASF intermediates, BASF