• mas also analyses toxic companions and precursors of dioxins such as polychlorinated benzenes, phenols, naphthalenes (PCBz, PCPh PCN) as well as the polycyclic aromatic hydrocarbons (PAHs), tributyltin and other organic halogen compounds. (muellerbbm.com)
  • Naphthalene is a precursor in the production of phthalic anhydride. (wikipedia.org)
  • Commercially-produced naphthalene is predominately used in the production of phthalic anhydride, which is used as an intermediate for polyvinyl chloride plasticizers such as di(2-ethylhexyl) phthalate. (cdc.gov)
  • Naphthalene is a simple polycyclic aromatic hydrocarbon, and is naturally available in white crystalline form. (growthmarketreports.com)
  • With regard to the formation of aromatic species up to naphthalene, it was essential to improve the fulvene and the C chemistry description in the mechanism. (edu.sa)
  • In this study, secondary organic aerosols (SOA) generated from aromatic precursors were found to sensitize singlet oxygen (1O2), an arguably underappreciated atmospheric ROS. (bvsalud.org)
  • The chromophore is an aromatic structure containing benzene, naphthalene, or anthracene. (ecotintes.com)
  • Naphthol is a class of aromatic organic compounds derived from naphthalene, featuring a hydroxyl group attached to the naphthalene ring. (pediaa.com)
  • Physical chemist Ralf Kaiser from the University of Hawaii and his colleagues conducted an experiment to see if frozen acetylene-a chemical compound used in welding-could be converted into complex organic molecules like the ones seen on Titan, specifically benzene and naphthalene. (gizmodo.com)
  • The new research shows that PAHs, including naphthalene and phenanthrene and its precursors benzene, phenylacetylene, and styrene, can be synthesized by irradiating frozen acetylene-a process that might be happening on Titan's surface and subsequently acting as "as a critical molecular feedstock to the organic dune material," the authors wrote in the study. (gizmodo.com)
  • In particular, benzene is found to be formed mainly via fulvene through the reactions of the CH isomers with CH The n-CH radical reacts with CH forming 1,3-pentadiene (CH), which is subsequently oxidized to form the naphthalene precursor cyclopentadienyl (CH). Oxidation of naphthalene is predicted to be a contributor to the formation of phenylacetylene (CH), indicating that consumption reactions can be of similar importance as molecular growth reactions. (edu.sa)
  • Further, isocyanate groups can be localized also on two different benzene rings of phenyl moieties or on a naphthalene moiety. (europa.eu)
  • THE IDENTIFICATION OF NONMUTAGENIC PRECURSORS AND POTENTIAL METABOLITES. (ncsu.edu)
  • Thanks to high resolution mass spectrometry, we were able to qualify and quantify different precursors and metabolites that take part in the development of UTA, allowing a better understanding of the mechanisms of AAP formation and the adjuvants actions involved in the wine protection. (infowine.com)
  • The chemical shifts of the ring protons of some monosubstituted naphthalenes were assigned from 250 MHz spectra, and the assignments were used to assist in the interpretation of the spectra of a number of naphthalene sulfonic acids which are commonly used as dyestuff intermediates. (ncsu.edu)
  • Naphthalene sulfonic acids are used in synthesis of dyestuffs and pharmaceuticals , among others. (growthmarketreports.com)
  • The modular synthesis is based on Suzuki cross-coupling of the aryl substituents as boronic acid precursors with 5,8-dibromo-2-( tert -butyl)-4,9-dimethoxy-2,3-dihydro-1H-phenalen-1-one, and the subsequent transformation of the product to the desired 2,5-diaryl 6-hydroxyphenalenone in a reduction/deprotection sequence. (thieme-connect.com)
  • Small Change, Big Impact: The Shape of Precursor Polymers Governs Poly-p-phenylene Synthesis. (mpg.de)
  • A table of parameters is presented which would assist in the identification of complex azo dyes that are derived from these naphthalene derivatives. (ncsu.edu)
  • This paper describes a strategy for the development of non-mutagenic dyes by identifying and elaborating some non-genotoxic precursors. (ncsu.edu)
  • It is a precursor to certain dyes. (alchetron.com)
  • This series of chalcone derivatives was characterized by the presence of a naphthalene ring as the second aryl system - which was kept unaltered. (ulpgc.es)
  • Naphthalene exposure is usually insignificant unless exposed to large amounts of naphthalene within production or being near proximity of a product that contains naphthalene. (wikipedia.org)
  • In 1999, this use of naphthalene accounted for 73 and 60% of commercial demand for naphthalene in Japan and the United States, respectively. (cdc.gov)
  • Increasing demand for naphthalene as a precursor in the production of construction chemicals and agrochemicals storage is expected to positively impact the market growth. (growthmarketreports.com)
  • Other uses of naphthalene include production of naphthalene sulfonates (used in concrete additives and synthetic tanning agents), pesticides (e.g., carbaryl insecticides and moth repellents), and dye intermediates. (cdc.gov)
  • Naphthalene is frequently present in industrial and automobile emissions and effluents and in various media in the general environment due to its natural occurrence in coal and petroleum products and emissions, its use as an intermediate in the production of plasticizers, resins, and insecticides, and its use in a variety of consumer products such as moth repellants. (cdc.gov)
  • Alpha naphthol serves as a precursor for various insecticides, including carbaryl, and finds application in pharmaceuticals such as nadolol and the antidepressant sertraline. (pediaa.com)
  • The naphthalene sulfonates segment is expected to hold a major market share during the forecast period owing to its excellent water reducing ability in concrete admixtures. (growthmarketreports.com)
  • The main difference between alpha and beta naphthol is the position of the hydroxyl (OH) group on the naphthalene ring. (pediaa.com)
  • In alpha naphthol, the hydroxyl group is attached to the carbon atom adjacent to the double bond in the naphthalene ring. (pediaa.com)
  • In beta naphthol, the hydroxyl group is attached to the carbon atom at the end of the naphthalene ring. (pediaa.com)
  • Alpha naphthol refers to the isomer where the hydroxyl group is situated next to the double bond in the ring, while beta naphthol is the isomer with the hydroxyl group at the end of the naphthalene ring. (pediaa.com)
  • It presents as a white solid and stands as an isomer of beta naphthol, differing in the placement of the hydroxyl group on the naphthalene ring. (pediaa.com)
  • This compound shares the same molecular formula with 1-naphthol, but it varies in the position of the hydroxyl group on the naphthalene ring. (pediaa.com)
  • They are isomers, differing only in the position of the hydroxyl group on the naphthalene ring. (pediaa.com)
  • Alpha naphthol is an organic compound with the molecular formula C 10 H 7 OH, characterized by a hydroxyl group attached to the carbon atom adjacent to the double bond in the naphthalene ring, whereas beta naphthol is a crystalline organic compound (C 10 H 7 OH) with a hydroxyl group attached to the carbon atom at the end of the naphthalene ring. (pediaa.com)
  • Tobacco is also a source of exposure, creating an estimated range of 0.3 to 4 micrograms of naphthalene inhalation per cigarette that is consumed. (wikipedia.org)
  • 0.0002 ppm) naphthalene in urban and suburban air samples and an inhalation rate of 20 m3/day, the average daily intake of naphthalene from ambient air is estimated at 19 µg/day, or 0.3 µg/kg/day assuming 70-kg body weight. (cdc.gov)
  • Reports that establish associations between naphthalene exposure and health effects in humans are restricted to numerous reports of hemolytic anemia or cataracts following acute exposure or occupational exposure to naphthalene, either by ingestion or by inhalation of naphthalene vapors, but these reports have not identified exposure levels associated with these effects. (cdc.gov)
  • Mostly organic compounds such as naphthalene reacts with an acid or alkali along with an intermediary (such as a nitrate or a sulfonated compound) and solvent mixture to form the dye. (ecotintes.com)
  • Moreover, they are both organic compounds consisting of a naphthalene ring structure. (pediaa.com)
  • From 1981 to 1983 the U.S. National Institute for Occupational Safety and Health found over 100,000 workers were potentially exposed to toxic levels of naphthalene, working primarily for major industrial and agricultural businesses. (wikipedia.org)
  • Monitoring studies of outdoor ambient air levels of naphthalene have reported concentrations in the range of about 0.4-170 µg/m3, with a median naphthalene concentration of 0.94 µg/m3 (0.0002 ppm) reported for urban/suburban air samples collected from 11 U.S. cities. (cdc.gov)
  • This naphthalene produced is not only toxic for the insects but can also affect humans in the same way[dubious - discuss]. (wikipedia.org)
  • The most common method involves the nitration of naphthalene to yield 1-nitronaphthalene, which is subsequently hydrogenated to produce the corresponding amine compound. (pediaa.com)
  • Naphthalene poisoning via termite nest was featured in the eleventh episode of the first season of the American television medical drama House, "Detox", where the final diagnosis ended up as acute naphthalene poisoning as a result of a termite nest being contained within the walls of the patient's bedroom, leading him to inhale naphthalene in his sleep and becoming sick. (wikipedia.org)
  • Naphthalene and methylnaphthalenes occur naturally in fossil fuels such as petroleum and coal, and are produced when organic materials (e.g., fossil fuels, wood, tobacco) are burned. (cdc.gov)
  • PROTON MAGNETIC-RESONANCE SPECTRA OF SOME NAPHTHALENE DERIVATIVES. (ncsu.edu)
  • The European Union enforced a ban on the distribution and production of mothballs containing naphthalene in 2008, as a part of the new regulations of the Registration, Evaluation and Authorisation of Chemicals (REACH), regulating chemical use within its representative countries. (wikipedia.org)
  • In 2000, estimates of commercial production of naphthalene in Japan, Western Europe, and the United States were 179, 205, and 107 thousand tonnes. (cdc.gov)
  • Artificially synthesized naphthalene compounds is used as precursors in the production of other chemicals. (growthmarketreports.com)
  • Ascorbic acid is used to treat methemoglobinemia, a symptom of naphthalene poisoning and is used when methylene blue is not available, or in conjunction with methylene blue in order to restore haemoglobin count. (wikipedia.org)
  • 1,5-Dihydroxynaphthalene is prepared from naphthalene-1,5-disulfonic acid by hydrolysis with strong base followed by acidification. (alchetron.com)
  • Initially, naphthalene is sulfonated with sulfuric acid, leading to the formation of a sulfonic acid compound. (pediaa.com)
  • Endogenous testosterone released from the sample by ANS (8-anilino-1-naphthalene sulfonic acid) and norgestrel competes with the added testosterone derivative labeled with ruthenium complex for the binding sites on the biotinylated antibody. (cdc.gov)
  • Increasing investment in the development of new applications of naphthalene for various industry verticals can creates opportunities for market industry players in the projected timeline. (growthmarketreports.com)
  • A regular pack a day smoker on average would be inhaling amounts of 6-80 micrograms of naphthalene daily, which is a small and negligible amount of naphthalene, and is similar in magnitude to normal exposure near highways and areas where car exhaust is frequently inhaled or consumed. (wikipedia.org)
  • The naphthalene that is produced in cigarette smoke is bound to other particles and is not presented as a free vapour, meaning the exposure is small. (wikipedia.org)
  • Evidence of temporary airway epithelial repopulation and rare clonal formation by BM-derived cells following naphthalene injury in mice. (ca.gov)
  • Naphthalene has also been found to be secreted by termites in order to protect their nests. (wikipedia.org)
  • A study of indoor and outdoor air in 24 low-income homes in North Carolina found naphthalene levels ranging from 0.33-9.7 µg/m3 and 0.57-1.82 µg/m3 respectively. (cdc.gov)
  • According to the International Agency for Research on Cancer, naphthalene is possibly carcinogenic to humans (Group 2B), as there is inadequate evidence in humans for the carcinogenicity of naphthalene, however there is sufficient evidence in experimental animals for the carcinogenicity of naphthalene. (wikipedia.org)
  • Naphthalene poisoning (or mothball poisoning) is a form of poisoning that occurs when naphthalene is ingested. (wikipedia.org)
  • 2. RELEVANCE TO PUBLIC HEALTH from cooking, tobacco smoking, or moth repellants are expected to be the predominant sources of naphthalene. (cdc.gov)
  • In 2002, environmental releases of naphthalene reported under the EPA Toxics Release Inventory (TRI) program were about 2.07 million pounds in air emissions, 0.03 million pounds in surface water discharges, 0.23 million pounds in underground injection discharges, and 0.37 million pounds in releases to land. (cdc.gov)
  • Alpha naphthol acts as a metabolite of the insecticide carbaryl and naphthalene. (pediaa.com)
  • Fluctuations in prices of crude oil and high level of toxicity associated with the use of naphthalene can hinder the growth of the naphthalene market. (growthmarketreports.com)
  • SOA was made from the photooxidation of APIN and naphthalene under high and low NOx conditions to test for reactive oxygen species formation. (ucdavis.edu)
  • These figures reflect estimates that most naphthalene entering the environment is discharged to the air, with the largest releases associated with the combustion of plant material and fossil fuels and volatilization from naphthalene- containing consumer products. (cdc.gov)
  • They set up a plant at Korba in Chhattisgarh as a precursor. (business-standard.com)
  • Naphthalene is a major component of some mothballs. (wikipedia.org)
  • Growing textile industry is anticipated to act as a major driver for the naphthalene market. (growthmarketreports.com)
  • 2-Aminoacetophenone: Causal component of "untypical ageing flavour," "naphthalene note," "hybrid note" of wine. (infowine.com)
  • Camphor is frequently used in place of naphthalene in Asia. (wikipedia.org)
  • Naphthalene levels within an area are very unstable and frequently change over time and space. (wikipedia.org)