Results 41 to 50 of about 24,253 (308)

Prenylated Benzophenones from

Natural Product Communications, 2008
The roots of Hypericum hypericoides (Clusiaceae) have yielded five prenylated benzophenone derivatives. Three of these are new: 18-hydroxy-7-epi-clusianone, 18-hydroxyclusianone, isolated as the acetate, and 18-hydroxyhyperibone K.
Omar E. Christian, Stewart McLean, William F. Reynolds, Helen Jacobs   +3 more
doaj   +1 more source

Regiodivergent photocyclization of dearomatized acylphloroglucinols: asymmetric syntheses of (—)-nemorosone and (—)-6-epi-garcimultiflorone A [PDF]

, 2019
Regiodivergent photocyclization of dearomatized acylphloroglucinol substrates has been developed to produce type A polycyclic polyprenylated acylphloroglucinol (PPAP) derivatives using an excited-state intramolecular proton transfer (ESIPT) process ...
Boyce, Jonathan H., Kandappa, Sunil K., Porco, Jr., John A., Sivaguru, Jayaraman, Wen, Saishuai   +4 more
core   +1 more source

Multiclass Determination of Endocrine-Disrupting Chemicals in Meconium: First Evidence of Perfluoroalkyl Substances in This Biological Compartment

Toxics
Major concerns have been raised about human exposure to endocrine-disrupting chemicals (EDCs) during pregnancy. Effective methodologies for the assessment of this exposure are needed to support the implementation of preventive measures and the prediction
Aritz Domínguez-Liste, Teresa de Haro-Romero, Raquel Quesada-Jiménez, Ainhoa Pérez-Cantero, Francisco Manuel Peinado, Óscar Ballesteros, Fernando Vela-Soria   +6 more
doaj   +1 more source

Field-Amplified Sample Injection-Micellar Electrokinetic Chromatography for the Determination of Benzophenones in Food Simulants [PDF]

, 2015
A field-amplified sample injection-micellar electrokinetic chromatography (FASI-MEKC) method for the determination of 14 benzophenones (BPs) in a food simulant used in migration studies of food packaging materials was developed, allowing almost baseline ...
Félez, Cristina, Molet, Anna, Núñez Burcio, Oscar   +2 more
core   +2 more sources

Highly Enantioselective Synthesis of Chiral Benzhydrols via Manganese Catalyzed Asymmetric Hydrogenation of Unsymmetrical Benzophenones Using an Imidazole-Based Chiral PNN Tridentate Ligand.

Organic Letters, 2019
A series of Mn(I) catalysts containing imidazole-based chiral PNN tridentate ligands with controllable "side arm" groups have been established, enabling the asymmetrical hydrogenation of unsymmetrical benzophenones with outstanding activity (up to 13 000
Fei Ling, Huacui Hou, Jiachen Chen, Sanfei Nian, Xiao Yi, Ze Wang, Dingguo Song, W. Zhong   +7 more
semanticscholar   +1 more source

Strategies Toward Accessing Enantioenriched (Hetero)Benzo‐Fused 5‐ and 6‐ Membered Rings via Intermolecular Carbometalation

Angewandte Chemie, EarlyView.
The use of transition‐metal catalysts and design of chiral ligands have allowed chemists to access highly functionalized benzofused 5‐ and 6‐ membered rings in high yield and enantioselectivity. A common strategy used relies on an intermolecular carbometalation across alkynes and olefins, usually followed by a subsequent intramolecular carbometalation.
Clara Jans, Armaan Grewal, Xavier Abel‐Snape, Mark Lautens   +3 more
wiley   +2 more sources

Topoisomerase 1 Promoter Variants and Benefit from Irinotecan in Metastatic Colorectal Cancer Patients [PDF]

, 2016
Objective: Topoisomerase 1 (topo-1) is an important target for the treatment of metastatic colorectal cancer (CRC). The aim of the present study was to evaluate the correlation between topo-1 single-nucleotide polymorphisms (SNPs) and clinical outcome in
Crea, F., Danesi, R., De Gregorio, V., Falcone, A., Fornaro, L., Graziano, F., Loupakis, F., Masi, G., Paolicchi, E., Ricci, V., Ronzoni, M., Vivaldi, C.   +11 more
core   +1 more source

Benzophenone Photosensitized DNA Damage

Accounts of Chemical Research, 2012
Although the carcinogenic potential of ultraviolet radiation is well-known, UV light may interact with DNA by direct absorption or through photosensitization by endogenous or exogenous chromophores. These chromophores can extend the "active" fraction of the solar spectrum to the UVA region and beyond, which means that photosensitizers increase the ...
Cuquerella Alabort, Maria Consuelo, Cadet, Jean, Miranda Alonso, Miguel Ángel, Lhiaubet, Virginie Lyria   +3 more
openaire   +3 more sources

Safety of benzophenone to be used as flavouring [PDF]

EFSA Journal, 2017
Benzophenone [FL-no: 07.032] has been evaluated as a flavouring substance, in FGE.69, by the EFSA Panel on Food Additives, Flavourings, Processing Aids and Materials in Contact with Food in 2008. Benzophenone was evaluated also by JECFA (2011) and by IARC (2013) based on studies that were not considered in the EFSA opinion on FGE.69.
Silano, Vittorio, Bolognesi, Claudia, Castle, Laurence, Chipman, Kevin, Cravedi, Jean-Pierre, Engel, Karl-Heinz, Fowler, Paul, Franz, Roland, Grob, Konrad, Gürtler, Rainer, Husøy, Trine, Kärenlampi, Sirpa, Milana, Maria Rosaria, Pfaff, Karla, Riviere, Gilles, Srinivasan, Jannavi, Tavares Poças, Maria de Fátima, Tlustos, Christina, Wölfle, Detlef, Zorn, Holger, Benigni, Romualdo, Binderup, Mona-Lise, Brimer, Leon, Marcon, Francesca, Marzin, Daniel, Mosesso, Pasquale, Mulder, Gerard, Oskarsson, Agneta, Svendsen, Camilla, Anastassiadou, Maria, Carfì, Maria, Saarma, Siiri, Mennes, Wim, EFSA Panel on Food Contact Materials, Enzymes, Flavourings and Processing Aids (CEF)   +33 more
openaire   +5 more sources

Potassium‐Ligand Cooperation Facilitated Chemical Bond Activation and Catalytic Hydrogenation

Angewandte Chemie, EarlyView.
A new strategy for alkali metal‐mediated catalysis based on metal–ligand cooperation (MLC) is presented. Potassium pincer complexes exhibit remarkable reactivity toward a range of molecules via an unprecedented potassium–ligand cooperative mechanism. This reactivity enables potassium‐catalyzed hydrogenation, providing efficient reduction of ketones and
Yaoyu Liang, Irena Efremenko, Thiyagarajan Subramanian, Amit Kumar, Liat Avram, Yael Diskin‐Posner, David Milstein   +6 more
wiley   +2 more sources