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Names | |
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Preferred IUPAC name 2,6-Di-tert-butylphenol | |
Other names 2,6-Bis(1,1-dimethylethyl)phenol Dibutylphenol 2,6-Bis(tert-butyl)phenol 2,6-Di(1,1-dimethylethyl)phenol 2,6-DTBP Ethanox 701 Ethyl 701 Ethyl AN 701 Irganox L 140 Isonox 103 TK 12891 | |
Identifiers | |
3D model (JSmol) | |
ChEBI | |
ChEMBL | |
ChemSpider | |
ECHA InfoCard | 100.004.441 |
EC Number |
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PubChem CID | |
RTECS number |
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UNII | |
UN number | 2430, 3077 |
CompTox Dashboard (EPA) | |
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Properties | |
C14H22O | |
Molar mass | 206.329 g·mol−1 |
Appearance | Low-melting colourless solid |
Melting point | 34 to 37 °C (93 to 99 °F; 307 to 310 K) |
Boiling point | 253 °C (487 °F; 526 K) |
Hazards | |
GHS labelling: | |
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Warning | |
H315, H319, H410 | |
P264, P273, P280, P302+P352, P305+P351+P338, P321, P332+P313, P337+P313, P362, P391, P501 | |
Flash point | 118 °C (244 °F; 391 K) |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). |
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. [1] Illustrative of its usefulness, it prevents gumming in aviation fuels.
2,6-Di-tert-butylphenol is prepared industrially via the Friedel–Crafts alkylation of phenol with isobutene catalyzed by aluminium phenoxide:
In this way, approximately 2.5M kg/y are produced. [2] Alkylation of phenol usually favours the para-position, and a strong lewis acid such as the Al3+ ion is necessary to give selective ortho‑alkylation. [3] [4] If a conventional brønsted acid is used then 2,4-di-tert-butylphenol will be produced instead.
Two species of plants, Jastropa curcas and Metaplexis japonica , contain 2,6-DTBP in seeds. [5]
Its dominant use is as an antioxidant.
2,6-Di-tert-butylphenol is used in the synthesis of 4,4′-biphenol. The process involves oxidative coupling of followed by removal of the tert-butyl groups. [6]
2,6-di-tert-butylphenol is a precursor to antioxidants and light-protection agents for the stabilization for polymers. One such case is methyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)-propionate (CAS# 6386-38-5), which is formed by the Michael addition of methyl acrylate. This compound is used in the synthesis of more complex antioxidants such as Irganox 1098. 2,6-Di-tert-butylphenol is also used in the synthesis of CGP-7930, probucol, and nicanartine.
The LD50 is 9200 mg/kg, indicating a low toxicity. [2]
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.