2,6-bis(1,1-dimethylethyl)phenol, dibutylphenol, 2,6-bis(tert-butyl)phenol, and 2,6-di(1,1-dimethylethyl) phenol, 2,6-DTBP, Ethanox 701, Ethyl 701, Ethyl AN 701, Irganox L 140, Isonox 103, TK 12891
|Appearance||Low-melting colourless solid|
|Melting point||34 to 36 °C (93 to 97 °F; 307 to 309 K)|
|Boiling point||253 °C (487 °F; 526 K)|
|R-phrases||R22 R36 R37 R38|
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
|what is: / ?)(|
2,6-Di-tert-butylphenol is an organic compound with the structural formula 2,6-((CH3)3C)2C6H3OH. This colorless solid alkylated phenol and its derivatives are used industrially as UV stabilizers and antioxidants for hydrocarbon-based products ranging from petrochemicals to plastics. Illustrative of its usefulness, it prevents gumming in aviation fuels.
- C6H5OH + 2 CH2=C(CH3)2 → ((CH3)3C)2C6H3OH
In this way, approximately 2.5M kg/y are produced.
2,6-Di-tert-butylphenol is a precursor to more complex compounds used as antioxidants and light-protection agents. Representative derivatives include 3,5-di-tert-butyl-4-hydroxybenzyl chloride (CAS# 955-01-1), 3,5-di-tert-butyl-4-hydroxybenzyl alcohol (CAS# 88-26-6), and methyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)- propionate (CAS# 6386-38-5). Such derivatives are prepared from 2,6-di-tert-butylphenol by chloromethylation and hydroxymethylation using formaldehye and alkylation with acrylic acid.
Safety and regulation
2,6-Di-tert-butylphenol is covered by the U.S. Department of Transportation Code of Federal Regulations 49 CFR 172.101, Appendix B (20 Dec 2004). This substance is designated by the U.S. Department of Transportation (DOT) as a marine pollutant.
- Helmut Fiege, Heinz-Werner Voges, Toshikazu Hamamoto, Sumio Umemura, Tadao Iwata, Hisaya Miki, Yasuhiro Fujita, Hans-Josef Buysch, Dorothea Garbe, Wilfried Paulus "Phenol Derivatives" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim, 2002. doi:10.1002/14356007.a19_313 Article Online Posting Date: June 15, 2000.