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Aromatic hydrocarbon

About: Aromatic hydrocarbon is a research topic. Over the lifetime, 5814 publications have been published within this topic receiving 55499 citations. The topic is also known as: arene & arenes.


Papers
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Journal ArticleDOI
TL;DR: In this article, the authors used an Attenuated Total Reflectance-Fourier Transform Infrared (ATR-FTIR) spectroscopic method to measure organic functional groups and inorganic ions at Tonto National Monument (TNM), an Interagency Monitoring of Protected Visual Environments (IMPROVE) sampling site in a rural area near Phoenix, Arizona.

61 citations

Journal ArticleDOI
TL;DR: A series of aromatic polyimides and polybenzoxazoles were synthesized and tested as membrane materials for separation of aromatic/aliphatic mixtures by pervaporation as mentioned in this paper.

61 citations

Book ChapterDOI
TL;DR: This review showed that both aerobic routes and anaerobic routes for the degradation of aromatic hydrocarbons are divided into two pathways, and the ability of these bacteria to express enzymes that catalyze reactions, known only in non-biological conditions, using final electron acceptors with a low redox potential is a most interesting topic.
Abstract: The aim of this revision was to build an updated collection of information focused on the mechanisms and elements involved in metabolic pathways of aromatic hydrocarbons by bacteria. Enzymes as an expression of the genetic load and the type of electron acceptor available, as an environmental factor, were highlighted. In general, the review showed that both aerobic routes and anaerobic routes for the degradation of aromatic hydrocarbons are divided into two pathways. The first, named the upper pathways, from the original compound to central intermediate compounds still containing the aromatic ring but with the benzene nucleus chemically destabilized. The second, named the lower pathway, begins with ring de-aromatizacao and subsequent cleavage, resulting in metabolites that can be used by bacteria in the production of biomass. Under anaerobic conditions the five mechanisms of activation of the benzene ring described show the diversity of chemical reactions that take place. Obtaining carbon and energy from an aromatic hydrocarbon molecule is a process that exhibits the high complexity level of the metabolic apparatus of anaerobic microorganisms. The ability of these bacteria to express enzymes that catalyze reactions, known only in non-biological conditions, using final electron acceptors with a low redox potential, is a most interesting topic. The discovery of phylogenetic and functional characteristics of cultivable and non-cultivable hydrocarbon degrading bacteria has been made possible by improvements in molecular research techniques such as SIP (stable isotope probing) making trace of 13C, 15N and 18O into nucleic acids and proteins.

61 citations

Patent
20 Feb 1990
TL;DR: In this article, a paint stripper and coatings remover composition free of methylene chloride is disclosed which contains N-methyl pyrrolidone, an aliphatic hydrocarbon such as mineral spirits, and a miscibilizing solvent such as an aromatic hydrocarbon.
Abstract: A paint stripper and coatings remover composition free of methylene chloride is disclosed which contains N-methyl pyrrolidone, an aliphatic hydrocarbon such as mineral spirits, and a miscibilizing solvent such as an aromatic hydrocarbon. The composition preferably also contains one or more additives such as a surfactant, thickener, or accelerator. Paint strippers having low volatility, outstanding effectiveness, and low toxicity may be obtained.

60 citations

Journal ArticleDOI
TL;DR: CP-PAHs 2b and 2c have potentially interesting fullerene-like photophysics and are poor singlet oxygen sensitizers with measured (1)O(2) quantum yields of 0.02 and 0.06, as expected from a simple Hückel analysis.
Abstract: A simple procedure for the synthesis of cyclopentafused polycyclic aromatic hydrocarbons (CP-PAH) with Pd(PPh3)2Cl2 catalyst has been applied to the one-pot palladium(0)-catalyzed coupling of 9,10-dibromoanthracene (1) with 2-methyl-3-butyn-2-ol. Reactions carried out in refluxing benzene in the presence of CuSO4/Al2O3 yielded 9,10-dialkynylanthracene 2a, alkynyl aceanthrylene 2b, and 2,7-disubstituted cyclopent[hi]aceanthrylene 2c in 13%, 23%, and 19% purified yields, respectively, with total conversions of 80−90%. Sealed tube reactions without copper at 110 °C improved the yield of 2c up to >75%. Single-crystal X-ray analyses of 2a and 2c reveal a three-dimensional hydrogen bonding network, producing a unique crystal packing. The packing structure of 2b is dominated by π−π stacking interactions between two aceanthrylene molecules. CP-PAHs 2b and 2c have potentially interesting fullerene-like photophysics. While the UV−vis and fluorescence spectra of 2a (ΦF = 0.87) show the characteristic vibronic struct...

60 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202319
202247
202155
2020143
2019177
2018195