If we substitute n=2 it satisfies the Huckel’s rule – 4n+2π electron condition. Low molecular weight PAHs, with two to four aromatic hydrocarbon rings, are more potent as co-carcinogens during the promotional stage of cancer.
Is naphthalene an aromatic or aliphatic compound? , The aromaticity varies for PAHs. Jan Cz. Change ), You are commenting using your Facebook account.  Developed countries with stricter air and water pollution controls, cleaner sources of cooking (i.e., gas and electricity vs. coal or biofuels), and prohibitions of public smoking tend to have lower levels of PAH exposure, while developing and undeveloped countries tend to have higher levels. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account.  Abiotic degradation in the atmosphere and the top layers of surface waters can produce nitrogenated, halogenated, hydroxylated, and oxygenated PAHs; some of these compounds can be more toxic, water-soluble, and mobile than their parent PAHs.. - Quora.  As of 2004, industrial processes and the extraction and use of fossil fuels made up slightly more than one quarter of global PAH emissions, dominating outputs in industrial countries such as the United States. Moss IUPAC nomenclature for fused-ring systems. In the next post we will discuss some more PAHs. , Multiple epidemiological studies of people living in Europe, the United States, and China have linked in utero exposure to PAHs, through air pollution or parental occupational exposure, with poor fetal growth, reduced immune function, and poorer neurological development, including lower IQ. Larger PAHs are generally insoluble in water, although some smaller PAHs are soluble.  A leading hypothesis is that PAHs may activate the cytochrome enzyme CYP1B1 in vascular smooth muscle cells.  Geographically, major roadways are thus sources of PAHs, which may distribute in the atmosphere or deposit nearby.  Consequently, the concentrations of pollutants in estuaries tends to decrease at the river mouth.  Such mutations, if they are not repaired, can transform genes encoding for normal cell signaling proteins into cancer-causing oncogenes. Takuya Echigo, Mitsuyoshi Kimata, and Teruyuki Maruoka (2007): "Crystal-chemical and carbon-isotopic characteristics of karpatite (C. František Mikeš, Geraldine Boshart, and Emanuel Gil-Av (1976): "Resolution of optical isomers by high-performance liquid chromatography, using coated and bonded chiral charge-transfer complexing agents as stationary phases". However, the overall distribution also suggested that the PAHs in London soils had undergone weathering and been modified by a variety of pre-and post-depositional processes such as volatilization and microbial biodegradation. All the above points clearly indicate that naphthalene is an aromatic entity too.
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