Alkylphenolsare a family of organic compounds obtained by the alkylation ofphenols.The term is usually reserved for commercially important propylphenol, butylphenol, amylphenol, heptylphenol, octylphenol,nonylphenol,dodecylphenol and related "long chain alkylphenols" (LCAPs). Methylphenols and ethylphenols are also alkylphenols, but they are more commonly referred to by their specific names, cresols and xylenols.[1]Some members of this group of compounds have proven controversial.[2]
Production and use
editThe long-chain alkylphenols are prepared byalkylationofphenolwithalkenes:
- C6H5OH + RR'C=CH2 → RR'CH−CH2−C6H4OH
In this way, about 500M kg/y are produced. Alkylphenols ethoxylates are common surfactants. Long-chain alkylphenols are used extensively as precursors to detergents. By condensation with formaldehyde, some alkylphenols are components inphenolic resins.[1]These compounds are also used as building-block chemicals in making fragrances, thermoplastic elastomers, antioxidants, oil field chemicals, and fire retardant materials. As plastizers and antioxidants, alkylphenols are also found in tires, adhesives, coatings, carbonless copy paper and high performance rubber products.
Environmental controversy over nonylphenols
editAlkylphenols arexenoestrogens.[3]Long chain Alkylphenols have the most potent estrogenic activity.[3]The European Union has implemented sales and use restrictions on certain applications in whichnonylphenolsare used because of their alleged "toxicity, persistence, and the liability to bioaccumulate" but the United States EPA has taken a slower approach to make sure that action is based on sound science.[4][5]
References
edit- ^abHelmut Fiege; Heinz-Werner Voges; Toshikazu Hamamoto; Sumio Umemura; Tadao Iwata; Hisaya Miki; Yasuhiro Fujita; Hans-Josef Buysch; Dorothea Garbe; Wilfried Paulus (2002). "Phenol Derivatives".Ullmann's Encyclopedia of Industrial Chemistry.Weinheim: Wiley-VCH.doi:10.1002/14356007.a19_313.ISBN978-3527306732.
- ^Kovarova, J., Blahova, J., Divisova, L., & Svobodova, Z. (2013). Alkylphenol ethoxylates and alkylphenols – update information on occurrence, fate and toxicity in aquatic environment. Polish Journal of Veterinary Sciences, 16(4), 762–771.https://doi.org/10.2478/pjvs-2013-0111
- ^abKochukov, Y.; Jeng, J.; Watson, S. (May 2009)."Alkylphenol xenoestrogens with varying carbon chain lengths differentially and potently activate signaling and functional responses in GH3/B6/F10 somatomammotropes".Environmental Health Perspectives.117(5): 723–730.doi:10.1289/ehp.0800182.ISSN0091-6765.PMC2685833.PMID19479013.
- ^European Bans on Surfactant Trigger Transatlantic Debate
- ^J. Kovarova, J. Blahova, L. Divisova, Z.Svobodova."Alkylphenol ethoxylates and alkylphenols– update information on occurrence,fate and toxicity in aquatic environment".PMID24597317.
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