Search results for "Benzofuran"
showing 10 items of 126 documents
ChemInform Abstract: Palladium-Catalyzed Skeletal Rearrangement of Spirotricyclic Olefins: A Facile One-Pot Strategy for the Synthesis of a Novel Mot…
2013
The first utilization of acyclic cyclopropane bearing spirocyclic olefines for the generation of stereospecific complex fused ring systems with an achiral catalyst is reported.
Determination of five pesticide residues in oranges by matrix solid-phase dispersion and liquid chromatography to estimate daily intake of consumers.
2001
Abstract Residues of benzoylphenylurea insecticides (diflubenzuron, hexaflumuron, and flufenuxuron), carboxamide acaricides (hexythiazox), and carbamate insecticides (benfuracarb) were determined in 150 orange fruit samples from September 1998 to June 1999, to estimate exposure of the Valencian population to oranges contaminated with these newly developed pesticides. The method for monitoring these residues is based on matrix solid-phase dispersion and liquid chromatography with UV or atmospheric pressure chemical ionization/mass spectrometry (APCI/MS) detection. Orange samples representing 11 varieties were collected from an agricultural cooperative and examined for the 5 pesticides. In 74…
Matrix solid-phase dispersion microextraction and determination by high-performance liquid chromatography with UV detection of pesticide residues in …
1999
A multiresidue method based on matrix solid-phase dispersion (MSPD) microextraction was studied to determine the carbamate, benfuracarb, and urea insecticides, diflubenzuron, flufenoxuron hexaflumuron and hexythiazox, used in control of citrus pests. Optimisation of different parameters, such as the type of solid support for matrix dispersion, elution solvents and the clean-up step were carried out. The method used 0.5 g of orange sample, C8 bonded silica as MSPD sorbent and dichloromethane as eluting solvent. Recoveries, at spiked concentrations below the maximum residue levels established by Spanish Government, were between 74 and 84% with relative standard deviations ranging from 2 to 4%…
Lipid-containing semipermeable membrane devices (SPMDs) as concentrators of toxic chemicals in the lower Fraser River, Vancouver, British Columbia.
1998
Abstract Semipermeable membrane devices (SPMDs) were deployed in the water column and in the sediments of the Lower Fraser River (B.C., Canada) to compare the levels and the congener profiles of polychlorinated dibenzo- p -dioxins (PCDDs), dibenzofurans (PCDFs) and non- ortho -chlorinated biphenyls (N-o,o′-PCBs) against those sampled by an Infiltrex resin column water sampler. Also the relationship between what was present in the ecosystem as sampled by SPMDs and what was accumulated in the tissue of resident benthic-feeding fish was explored. Only the lipid portion of the SPMDs was prepared for analysis, due to some technical difficulties in cleaning the polyethene tubing. The calculated w…
New qsar models for polyhalogenated aromatics
1994
Electronic properties of polychlorinated dibenzo p dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs), polychlorinated biphenyls (PCBs), and polychlorinated diphenyl ethers (PCDEs) were calculated using the semi-empirical AM1 method The calculated electronic descriptors — the energy of the lowest unoccupied molecular orbital (ELUMO), the energy of the highest occupied molecular orbital (EHOMO), the ELUMO-EHOMO gap (dE), and molecular polarizability — are related to the Ah receptor binding affinity values of PCDDs, PCDFs, and PCBs and immunotoxicity values for PCDEs The quantitative structure activity relationships (QSARs) based on chlorine substitution patterns were also constructed, an…
CCDC 639296: Experimental Crystal Structure Determination
2007
Related Article: J.Becker, R.Frohlich, K.Salorinne, D.Hoppe|2007|Eur.J.Org.Chem.|2007|3337|doi:10.1002/ejoc.200700219
CCDC 795371: Experimental Crystal Structure Determination
2011
Related Article: J.Barjau, G.Schnakenburg, S.R.Waldvogel|2011|Angew.Chem.,Int.Ed.|50|1415|doi:10.1002/anie.201006637
CCDC 1816140: Experimental Crystal Structure Determination
2018
Related Article: Aysun Çapcı Karagöz, Christoph Reiter, Ean-Jeong Seo, Lisa Gruber, Friedrich Hahn, Maria Leidenberger, Volker Klein, Frank Hampel, Oliver Friedrich, Manfred Marschall, Barbara Kappes, Thomas Efferth, Svetlana B. Tsogoeva|2018|Bioorg.Med.Chem.|26|3610|doi:10.1016/j.bmc.2018.05.041
CCDC 1589070: Experimental Crystal Structure Determination
2018
Related Article: Sebastian Lips, Bernardo Antonio Frontana‐Uribe, Maurice Dörr, Dieter Schollmeyer, Robert Franke, Siegfried R. Waldvogel|2018|Chem.-Eur.J.|24|6057|doi:10.1002/chem.201800919
CCDC 838879: Experimental Crystal Structure Determination
2012
Related Article: J.Barjau, J.Fleischhauer, G.Schnakenburg, S.R.Waldvogel|2011|Chem.-Eur.J.|17|14785|doi:10.1002/chem.201102722