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Naphthalene

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https://www.readbyqxmd.com/read/28731341/a-2d-coordination-network-that-detects-nitro-explosives-in-water-catalyzes-baylis-hillman-reactions-and-undergoes-unusual-2d%C3%A2-3d-single-crystal-to-single-crystal-transformation
#1
Vivekanand Sharma, Dinesh De, Sanchari Pal, Prithwidip Saha, Parimal K Bharadwaj
The solvothermal reaction of Zn(NO3)2·6H2O and a linear dicarboxylate ligand H2L, in the presence of urotropine in N,N'-dimethylformamide (DMF), gives rise to a new porous two-dimensional (2D) coordination network, {[Zn3(L)3(urotropine)2]·2DMF·3H2O}n (1), with hxl topology. Interestingly, framework 1 exhibits excellent emission properties owing to the presence of naphthalene moiety in the linker H2L, that can be efficiently suppressed by subtle quantity of nitro explosives in aqueous medium. Furthermore, presence of urotropine molecules bound to the metal centers, 1 is found to be an excellent heterogeneous catalyst meant for atom-economical C-C bond-forming Baylis-Hillman reactions...
July 21, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28729892/reversible-charge-trapping-in-bis-carbazole-diimide-redox-polymers-with-complete-luminescence-quenching-enabling-nondestructive-read-out-by-resonance-raman-spectroscopy
#2
Luuk Kortekaas, Federico Lancia, Jorn D Steen, Wesley R Browne
The coupling of substituted carbazole compounds through carbon-carbon bond formation upon one-electron oxidation is shown to be a highly versatile approach to the formation of redox polymer films. Although the polymerization of single carbazole units has been proposed earlier, we show that by tethering pairs of carbazoles double sequential dimerization allows for facile formation of redox polymer films with fine control over film thickness. We show that the design of the monomers and in particular the bridging units is key to polymer formation, with the diaminobenzene motif proving advantageous, in terms of the matching to the redox potentials of the monomer and polymer film and thereby avoiding limitations in film thickness (autoinsulation), but introduces unacceptable instability due to the intrinsic redox activity of this moiety...
July 13, 2017: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://www.readbyqxmd.com/read/28729541/an-easy-gene-assembling-strategy-for-light-promoted-transfection-by-combining-host-guest-interaction-of-cucurbit-7-uril-and-gold-nanoparticles
#3
Jianwei Du, Peng Zhang, Xiao Zhao, Youxiang Wang
Cucurbit[7]uril (CB[7]), a representative member of the host family cucurbit[n]uril, can host-guest interact with many guest molecules such as adamantane, viologen and naphthalene derivatives. This host-guest interaction provides an easy strategy in gene vector assembling. Furthermore, CB[7] can self-assemble on gold nanospheres (AuNSs). Herein, the combination of CB[7] and AuNSs provides both advantages of host-guest interaction and photo-thermal effect of AuNSs. In this study, polyethyleneimine (PEI) and polyethylene glycol (PEG) were separately interacted with CB[7] via host-guest interaction...
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28729057/neuropathic-pain-alleviating-effects-of-pyrazole-conjugated-arylsulfonamides-as-5-ht6-receptor-antagonists
#4
Jin Ri Hong, Hyunah Choo, Ghilsoo Nam
A novel series of arylsulfonylaminomethyl-3-(1-phenyl-5-isopropyl)pyrazoles was evaluated for serotonin receptor subtype 6 (5-HT6R) antagonistic effects in vitro. We also investigated their neuropathic pain-alleviating effects in vivo using a rat spinal nerve ligation (SNL) model. Bicyclic aromatic sulfonamino groups, such as naphthalene and quinolin-substituted derivatives, showed good 5-HT6 inhibitory activity in vitro. Among them, selected compounds, 12 and 13, having 8-quinoylsulfonamino groups, showed potent neuropathic pain-alleviating effects in the rat model...
July 11, 2017: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28728845/crystal-structure-of-cis-dihydrodiol-naphthalene-dehydrogenase-nahb-from-pseudomonas-sp-mc1-insights-into-the-early-binding-process-of-the-substrate
#5
Ae Kyung Park, Hyun Kim, Il-Sup Kim, Soo Jung Roh, Seung Chul Shin, Jun Hyuck Lee, Hyun Park, Han-Woo Kim
The bacterial strain Pseudomonas sp. MC1 harbors an 81-kb metabolic plasmid, which encodes enzymes involved in the conversion of naphthalene to salicylate. Of these, the enzyme NahB (cis-dihydrodiol naphthalene dehydrogenase), which catalyzes the second reaction of this pathway, binds to various substrates such as cis-1,2-dihydro-1,2-dihydroxy-naphthalene (1,2-DDN), cis-2,3-dihydro-2,3-dihydroxybiphenyl (2,3-DDB), and 3,4-dihydro-3,4-dihydroxy-2,2',5,5'-tetrachlorobiphenyl (3,4-DD-2,2',5-5-TCB). However, the mechanism underlying its broad substrate specificity is unclear owing to the lack of structural information...
July 17, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28725525/microbial-degradation-of-petrochemical-waste-polycyclic-aromatic-hydrocarbons
#6
M H Fulekar
BACKGROUND: Petrochemical industry is one of the fastest growing industries. This industry has immense importance in the growth of economy and manufacture of large varieties of chemicals. The petrochemical industry is a hazardous group of industry generating hazardous waste containing organic and inorganic compounds. In spite of the present treatment process, the hazardous waste compounds are found untreated to the acceptable level and found discharged at soil-water environment resulting into the persistent organic-inorganic pollutant into the environment...
2017: Bioresources and Bioprocessing
https://www.readbyqxmd.com/read/28723175/synthesis-of-1-1-disubstituted-indenes-and-dihydronaphthalenes-through-c-c-c-c-bond-forming-pd-catalyzed-autotandem-reactions
#7
Raquel Barroso, Miguel Paraja, María-Paz Cabal, Carlos Valdés
A novel synthesis of 1,1-disubstituted 1H-indenes is described involving the Pd-catalyzed cascade reaction between o-bromophenyl-β-bromostyrenes and N-tosylhydrazones in a process comprising the consecutive formation of two Csp(3)-C bonds on the same carbon atom: the cross-coupling of the N-tosylhydrazone with the alkenyl bromide and the intramolecular Heck reaction on the newly formed double bond. A similar approach has been applied to the preparation of 1,1-disubstituted naphthalenes.
July 19, 2017: Organic Letters
https://www.readbyqxmd.com/read/28720958/aroma-composition-of-shalgam-a-traditional-turkish-lactic-acid-fermented-beverage
#8
Hasan Tanguler, Serkan Selli, Kemal Sen, Turgut Cabaroglu, Huseyin Erten
Shalgam, a traditional red, cloudy and sour soft beverage, is produced by lactic acid fermentation of black carrot, sourdough, salt, bulgur flour, turnip and adequate water. The present study was designed to characterize the volatile compounds of shalgam obtained from different methods. The aroma compounds of shalgams produced by traditional and direct methods, and addition of Lactic acid bateria (LAB) cultures were examined. Volatile components of shalgam samples were extracted by liquid-liquid extraction technique with pentane/dichloromethane and analyzed by gas chromatography-mass spectrometry (GC-MS)...
June 2017: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28720905/antiplasmodial-ealapasamines-a-c-mixed-naphthylisoquinoline-dimers-from-the-central-african-liana-ancistrocladus-ealaensis
#9
Dieudonné Tshitenge Tshitenge, Doris Feineis, Virima Mudogo, Marcel Kaiser, Reto Brun, Gerhard Bringmann
Three unusual heterodimeric naphthylisoquinoline alkaloids, named ealapasamines A-C (1-3), were isolated from the leaves of the tropical plant Ancistrocladus ealaensis J. Léonard. These 'mixed', constitutionally unsymmetric dimers are the first stereochemically fully assigned cross-coupling products of a 5,8'- and a 7,8'-coupled naphthylisoquinoline linked via C-6' in both naphthalene portions. So far, only two other West and Central Ancistrocladus species were known to produce dimers with a central 6,6″-axis, yet, in contrast to the ealapasamines, usually consisting of two 5,8'-coupled monomers, like e...
July 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28720735/a-nonredundant-phosphopantetheinyl-transferase-ppta-is-a-novel-antifungal-target-that-directs-secondary-metabolite-siderophore-and-lysine-biosynthesis-in-aspergillus-fumigatus-and-is-critical-for-pathogenicity
#10
Anna Johns, Daniel H Scharf, Fabio Gsaller, Hella Schmidt, Thorsten Heinekamp, Maria Straßburger, Jason D Oliver, Mike Birch, Nicola Beckmann, Katharine S Dobb, Jane Gilsenan, Bharatkumar Rash, Elaine Bignell, Axel A Brakhage, Michael J Bromley
Secondary metabolites are key mediators of virulence for many pathogens. Aspergillus fumigatus produces a vast array of these bioactive molecules, the biosynthesis of which is catalyzed by nonribosomal peptide synthetases (NRPSs) or polyketide synthases (PKSs). Both NRPSs and PKSs harbor carrier domains that are primed for acceptance of secondary metabolic building blocks by a phosphopantetheinyl transferase (P-pant). The A. fumigatus P-pant PptA has been shown to prime the putative NRPS Pes1 in vitro and has an independent role in lysine biosynthesis; however, its role in global secondary metabolism and its impact on virulence has not been described...
July 18, 2017: MBio
https://www.readbyqxmd.com/read/28719203/the-singlet-la-and-lb-bands-for-n-acenes-n-2-to-7-a-casscf-caspt2-study
#11
Fernanda Bettanin, Luiz F A Ferrão, Max Pinheiro, Adelia J A Aquino, Hans Lischka, Francisco Bolivar Correto Machado, Dana Nachtigallova
In this work CASPT2 calculations of polyacenes (from naphthalene to heptacene) were performed to find a methodology suitable for calculations of the absorption spectra, in particular of the La (B2u state) and Lb (B3u state) bands, of more extended systems. The effect of the extension of the active space and of freezing  orbitals were investigated. The MCSCF excitation energy of the B2u state is not sensitive to the size of the active space used. However, the CASPT2 results depends strongly on the amount of σ orbitals frozen reflecting the ionic character of the B2u state...
July 18, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28715030/a-chiral-binol-based-gemini-amphiphilic-gelator-and-its-specific-discrimination-of-native-arginine-by-gelation-in-water
#12
Lihua Jia, Jianxin Yin, Xiangfeng Guo, Guangzhou Cao, Xuhua Tian, Bo Zhu, Lin Pu
A novel axially chiral cationic Gemini amphiphile gelator (S1) derived from (S)-BINOL has been synthesized and characterized by (1)H NMR, (13)C NMR, ESI-MS and FT-IR analyses. The critical micelle concentration (CMC) of S1 was determined to be 0.21 mM in water at room temperature. A transparent hydrogel with S1 at 43 mM was obtained at room temperature and characterized using various methods including SEM, CD, fluorescence, (1)H NMR, FT-IR, and XRD. The results indicate that the hydrophobic effect of long alkyl chains, π-π stacking of naphthalene rings, and intermolecular hydrogen-bonding of the amide groups of S1 should be responsible for the hydrogel formation...
July 17, 2017: Soft Matter
https://www.readbyqxmd.com/read/28714937/photosynthesis-inhibiting-activity-of-1-2-chlorophenyl-carbamoyl-and-1-2-nitrophenyl-carbamoyl-naphthalen-2-yl-alkylcarbamates
#13
Tomas Gonec, Josef Stranik, Matus Pesko, Jiri Kos, Michal Oravec, Katarina Kralova, Josef Jampilek
Eight 1-[(2-chlorophenyl)carbamoyl]naphthalen-2-yl alkylcarbamates and eight 1-[(2-nitrophenyl)carbamoyl]naphthalen-2-yl alkylcarbamates were tested for their activity related to the inhibition of photosynthetic electron transport (PET) in spinach (Spinacia oleracea L.) chloroplasts. The PET-inhibiting activity of the compounds was relatively low; the corresponding IC50 values ranged from 0.05 to 0.664 mmol/L; and the highest activity within the series of compounds was observed for 1-[(2-chlorophenyl)-carbamoyl]naphthalen-2-yl propylcarbamate...
July 17, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28714683/regioselective-diversification-of-2-1-borazaronaphthalenes-unlocking-isosteric-space-via-c-h-activation
#14
Geraint H M Davies, Matthieu Jouffroy, Fatemeh Sherafat, Borna Saeednia, Casey Howshall, Gary A Molander
Methods for the regioselective C-H borylation and subsequent cross-coupling of the 2,1-borazaronaphthalene core are reported. Azaborines are dependent on B-N/C═C isosterism when employed in strategies for developing diverse heterocyclic scaffolds. Although 2,1-borazaronaphthalene is closely related to naphthalene in terms of structure, the argument is made that the former has electronic similarities to indole. Based on that premise, iridium-mediated C-H activation has enabled facile installation of a versatile, nucleophilic coupling handle at a previously inaccessible site of 2,1-borazaronaphthalenes...
July 17, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28714266/potential-biotechnological-capabilities-of-cultivable-mycobiota-from-carwash-effluents
#15
Timothy Sibanda, Ramganesh Selvarajan, Memory Tekere, Hlengilizwe Nyoni, Stephen Meddows-Taylor
Urban life has created man-made extreme environments like carwashes. These environments have, however, not been sufficiently explored for mycobiota that can be sources of biotechnologically useful products, as has been the case with natural extreme environments. Using a combination of culture and molecular techniques, fungi from carwash effluents was characterized for production of lipase and cellulase enzymes, nonpolar and polar biotechnologically relevant secondary metabolites and hydrocarbon utilization...
July 17, 2017: MicrobiologyOpen
https://www.readbyqxmd.com/read/28714253/an-off-on-off-type-fluorescent-probe-based-on-a-naphthalene-derivative-for-al-3-and-f-ions-and-its-biological-application
#16
Yanpeng Ren, Juan Han, Yun Wang, Xu Tang, Lei Wang, Liang Ni
A novel fluorescent probe-based naphthalene Schiff, 1-(C2-glucosyl-ylimino-methyl)-naphthalene-2-ol (L) was synthesized by coupling d-glucosamine hydrochloride with 2-hydroxy-1-naphthaldehyde. It exhibited excellent selectivity and highly sensitivity for Al(3+) in ethanol with a strong fluorescence response, while other common metal ions such as Pb(2+) , Mg(2+) , Cu(2+) , Co(2+) , Ni(2+) , Cd(2+) , Fe(2+) , Mn(2+) , Hg(2+) , Li(+) , Na(+) , K(+) , Fe(3+) , Cr(3+) , Zn(2+) , Ag(+) , Ba(2+) and Ca(2+) did not cause the same fluorescence response...
July 17, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28712771/characterization-and-ecological-risk-of-polycyclic-aromatic-hydrocarbons-pahs-and-n-alkanes-in-sediments-of-shadegan-international-wetland-the-persian-gulf
#17
Akram Bemanikharanagh, Alireza Riyahi Bakhtiari, Jahangard Mohammadi, Ruhollah Taghizadeh-Mehrjardi
The distribution and sources of PAHs and n-alkanes were determined in the surface sediments from 202 locations in Shadegan international wetland with 537,700ha. The concentrations of total n-alkanes and PAHs ranged from 395.3 to 14933.46μgg(-1)dw and 593.74 to 53393.86ngg(-1)dw, respectively. Compared with other worldwide surveys, the concentration and contamination of sedimentary hydrocarbons were classified very high. A common petrogenic hydrocarbon source was strongly suggested in all sites by n-alkanes' profile with a Cmax at n-C20, Pr/Ph and CPI ratios<1 in all sites, and high percentage of UCM...
July 13, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28710979/characterization-of-chemical-fingerprints-of-unconventional-bakken-crude-oil
#18
Chun Yang, Patrick Lambert, Gong Zhang, Zeyu Yang, Mike Landriault, Bruce Hollebone, Ben Fieldhouse, Fatemeh Mirnaghi, Carl E Brown
The ability to characterize the composition of emerging unconventional Bakken tight oil is essential to better prepare for potential spills and to assess associated environmental concerns. The present work measured and compared the physical and chemical properties of Bakken crudes with conventional crude oils from various regions and different types of refined petroleum products. The physicochemical properties of Bakken crude are overall similar to those of conventional light crudes. The Bakken crude consists of high concentrations of monoaromatic hydrocarbons and alkylated PAHs with a clear dominance of the alkylated naphthalene homologues followed by the phenanthrene series...
July 12, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28709671/mechanism-and-properties-of-positive-allosteric-modulation-of-n-methyl-d-aspartate-receptors-by-6-alkyl-2-naphthoic-acid-derivatives
#19
Kiran Sapkota, Mark W Irvine, Guangyu Fang, Erica S Burnell, Neil Bannister, Arturas Volianskis, Georgia R Culley, Shashank M Dravid, Graham L Collingridge, David E Jane, Daniel T Monaghan
The theory that N-methyl-d-aspartate receptor (NMDAR) hypofunction is responsible for the symptoms of schizophrenia is well supported by many pharmacological and genetic studies. Accordingly, positive allosteric modulators (PAMs) that augment NMDAR signaling may be useful for treating schizophrenia. Previously we have identified several NMDAR PAMs containing a carboxylic acid attached to naphthalene, phenanthrene, or coumarin ring systems. In this study, we describe several functional and mechanistic properties of UBP684, a 2-naphthoic acid derivative, which robustly potentiates agonist responses at each of the four GluN1a/GluN2 receptors and at neuronal NMDARs...
July 11, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28707373/biomarker-responses-and-pah-ratios-in-fish-inhabiting-an-estuarine-urban-waterway
#20
Rafael Mendonça Duarte, Helen Sadauskas-Henrique, Vera Maria Fonseca de Almeida-Val, Adalberto Luis Val, Helen Elizabeth Nice, Marthe Monique Gagnon
Many cities worldwide are established adjacent to estuaries and their catchments resulting in estuarine contamination due to intense anthropogenic activities. The aim of this study was to evaluate if fish living in an estuarine urban waterway were affected by contamination, via the measurement of a suite of biomarkers of fish health. Black bream (Acanthopagrus butcheri) were sampled in a small urban embayment and a suite of biomarkers of fish health measured. These were condition factor (CF), liver somatic index (LSI), gonadosomatic index (GSI), hepatic EROD activity, polycyclic aromatic hydrocarbon (PAH) biliary metabolites, serum sorbitol dehydrogenase (s-SDH) and branchial enzymes cytochrome C oxidase (CCO), and lactate dehydrogenase (LDH) activities...
July 14, 2017: Environmental Toxicology
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