bluuebunny/crossref_metadata_2025_split huggingface dataset:
The effect of γ‐Irradiation and reactive extrusion on the structure and properties of polycarbonate and starch blends: A work oriented to the recycling of thermoplastic wastes
Authors: Vignon Anaïs , Ayoub Ali , Massardier Valérie 
Published: May 2012

AbstractPolymer materials with improved properties can be obtained through polymer blends. As a polymer mixture is generally immiscible and incompatible, it is necessary to develop new methods to improve the interfacial adhesion. In this study, polycarbonate‐based extruded thermoplastic were developed by blending polycarbonate with thermoplastic starch using extensive process engineering based on structure–property correlations. Starch was destructurized and plasticized followed by melt‐blending with polycarbonate. The optimal conditions for processing of the thermoplastics blends were found to be 230°C, 2 min of processing time, and 3–6 wt % of glycerol. The effect of γ‐irradiation on the fabrication of the blend was studied. Changes in structure, morphology, and properties resulting from γ‐exposure in the range 0–150 kGy were investigated. Electron spin resonance results revealed that numerous radicals remained trapped in the materials after irradiation even after a long time enabling reactions between starch and polycarbonate. Results obtained from tensile test, differential scanning calorimetry, and dynamic mechanical analysis revealed the relatively good affinity between the two components after blending in a micro‐extruder. Irradiated blends are thermally more stable than those non‐irradiated. Mechanical tests also showed that the efficiency of the irradiation depended greatly on the dose applied to the initial materials. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
Influence of laminate thickness reduction on the deformation mechanism of coextruded multilayered PC/PMMA films
Authors: Scholtyssek Stefanie , Seydewitz Volker , Adhikari Rameshwar , Pfeifer Frank , Michler Goerg Hannes , Siesler Heinz Wilhelm 
Published: May 2012

AbstractThe influence of the morphology of multilayered composites of poly(methyl‐methacrylate) (PMMA) and polycarbonate (PC) fabricated by layer multiplying coextrusion technique on their mechanical and especially their micromechanical deformation behavior was investigated. Electron microscopic studies revealed that the PC/PMMA multilayered composites have a well‐oriented, uniform, and continuous layered architecture. With decreasing layer thickness of each polymer in the composite, the elongation at break of the films was found to increase significantly which was correlated with a transition from a two‐component behavior (for single‐layer thickness of ≥8 μm) to an one‐component behavior (for single‐layer thickness of ≤250 nm). Rheo‐optical measurements using FTIR spectroscopy revealed that the molecular orientation during stretching of the PMMA phase remains unchanged for all the investigated films, whereas the PC orientation function decreases with decreasing layer thickness. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
Development of high Tg epoxy resin and mechanical properties of its fiber‐reinforced composites
Authors: Yi Jin‐Woo , Um Moon‐Kwang , Byun Joon‐Hyung , Lee Sang‐Bok , Lee Sang‐Kwan 
Published: May 2012

AbstractA new epoxy resin with high glass transition temperature (Tg) (∼ 180°C) and a viscosity low enough for infiltration into dry reinforcements at 40°C was developed for the vacuum‐assisted resin transfer molding process. To study the curing behavior and viscosity, several blends were formulated using multifunctional resin, aromatic hardener, and reactive diluents. Effects of these components on the viscosity and Tg were investigated by thermomechanical analysis, dynamic scanning calorimetry, and rheometer. Experimental results showed that a liquid aromatic hardener and multifunctional epoxy resin should be used to decrease the viscosity to <1 Pa·s at 40°C. Moreover, the addition of a proper reactive diluent decreased the viscosity and simultaneously minimized the deterioration of Tg. Mechanical properties of the composite produced with the optimized blend were evaluated at both room‐temperature and high‐temperature conditions. According to the results, the composite showed comparable mechanical properties with that of the current commercial resin. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
Lack of Tir Ubiquitylation Contributes to Enteropathogenic E. coli Remaining Extracellular During Nonphagocytic Cell Infections
Authors: Lin Ann E. , Guttman Julian A. 
Published: May 2012

AbstractEnteropathogenic Escherichia coli (EPEC) is an extracellular pathogen that alters many host subcellular components during its infectious processes. We have previously shown that EPEC hijacks a large assortment of host cell endocytic components and uses these proteins to form protruding structures called “pedestals” rather than triggering internalization of the bacteria. Other invasive pathogens that also recruit similar endocytic components have been shown to enter their host cells on the ubiquitylation of their host cell receptors. Therefore, we hypothesize that EPEC remains extracellular by maintaining its receptor, translocated intimin receptor (Tir), in an unubiquitylated state. Using immunoprecipitation‐Western blots, we demonstrate no association of ubiquitin with Tir. To further elucidate the effect Tir ubiquitylation would have on EPEC during their infections, we engineered Tir‐ubiquitin fusion constructs, expressed them in host epithelial cells, and infected them with Δtir EPEC. We found these cells induced a significant increase in EPEC invasion as compared with cells that expressed the Tir construct that lacked ubiquitin conjugation. Our results indicate that the lack of EPEC receptor ubiquitylation is a contributing factor that these microbes use to prevent their internalization into epithelial cells. Anat Rec, 2012. © 2012 Wiley Periodicals, Inc.
Intramolecular [2+2] Photocycloaddition Reactions as an Entry to the 2‐Oxatricyclo[4.2.1.04, 9]nonan‐3‐one Skeleton of Lactiflorin
Authors: Lu Ping , Herdtweck Eberhardt , Bach Thorsten 
Published: May 2012

AbstractTwo [2+2] photocycloaddition routes were evaluated as possible ways to access the tricyclic core structure found in the terpene monoglycoside lactiflorin. While the first route via γ‐substituted cyclopentenones was quickly discarded, the reactions of racemic (5R*)‐3‐benzyloxy‐5‐but‐3′‐enyl‐4‐methoxycarbonylfuran‐2(5 H)‐ones proceeded in high yields and with perfect diastereoselectivity. However, it turned out that the regioselectivity was strongly dependent on the substitution pattern within the but‐3′‐enyl chain, which connects the terminal olefinic double bond to the photoexcited butenolide chromophor. If the chain was unsubstituted or if a tert‐butyldimethylsilyloxy group was placed at the 2′ position in a syn‐relationship to the existing stereogenic center (5R*,2′S*), the crossed product prevailed with regioselectivities of 89:11 to 69:31. If the tert‐butyldimethylsilyloxy group was positioned at 2′ in an anti‐relationship to the existing stereogenic center (5R*,2′R*), the desired straight products were obtained in regioselectivities of 74:24 to 55:45 (61–83 % yield). Following this route, the aglycon part of lactiflorin was obtained by an intramolecular [2+2] photocycloaddition and a subsequent hydrogenolysis in 53 % yield. Its further conversion into the natural product after glycosylation included a methyl addition to the lactone carbonyl group, which was optimized to give the desired key intermediate in a yield of 70 %. The further conversion to lactiflorin was achieved in four steps and with an overall yield of 49 %.
Lipid‐transfer proteins
Authors: Ng Tzi Bun , Cheung Randy Chi Fai , Wong Jack Ho , Ye Xiujuan 
Published: May 2012

AbstractLipid‐transfer proteins (LTPs) are basic proteins found in abundance in higher plants. LTPs play lots of roles in plants such as participation in cutin formation, embryogenesis, defense reactions against phytopathogens, symbiosis, and the adaptation of plants to various environmental conditions. In addition, LTPs from field mustard and Chinese daffodil exhibit antiproliferative activity against human cancer cells. LTPs from chili pepper and coffee manifest inhibitory activity against fungi pathogenic to humans such as Candida species. The intent of this article is to review LTPs in the plant kingdom. © 2012 Wiley Periodicals, Inc. Biopolymers (Pept Sci) 98: 268‐279, 2012.
Quantification of homocysteine‐related metabolites and the role of betaine–homocysteine S‐methyltransferase in HepG2 cells
Authors: Kořínek Marek , Šístek Václav , Mládková Jana , Mikeš Petr , Jiráček Jiří , Selicharová Irena 
Published: May 2012

ABSTRACTWe optimized and validated a rapid and sensitive liquid chromatography–tandem mass spectrometry (LC‐MS/MS) method for the quantification of six metabolites of homocysteine metabolism: homocysteine, methionine, cysteine, S‐adenosylmethionine, S‐adenosylhomocysteine and betaine. The detection limits for these metabolites were in the nanomolar range, and the intra‐ and inter‐day precisions were lower than 20% of the relative standard deviations. The method was specifically designed for the determination of the intracellular concentrations of the metabolites in cultured cells. To study the role of betaine–homocysteine S‐methyltransferase (BHMT), HepG2 cells and HepG2 cells that were stably transfected with BHMT (BHMTHepG2) were treated with homocysteine or with a specific inhibitor of BHMT, and metabolite levels were subsequently measured. Severely compromised methyl group metabolism in the HepG2 cells, which is typical of cancer‐derived cells, prevented clear evaluation of the changes caused by the external manipulations of homocysteine metabolism. However, the ease of handling these cells and the almost unlimited source of experimental material supplied by cells in permanent culture allowed us to develop a reliable methodology. The precautions concerning intracellular metabolite determinations using LC‐MS/MS in cultured cells that are expressed in this work will have global validity for future metabolomics studies. Copyright © 2012 John Wiley & Sons, Ltd.
ChemInform Abstract: H2Ti6O13, a New Protonated Titanate Prepared by Li+/H+ Ion Exchange: Synthesis, Crystal Structure and Electrochemical Li Insertion Properties.
Authors: Perez‐Flores J. C. , Baehtz C. , Hoelzel M. , Kuhn A. , Garcia‐Alvarado F. 
Published: May 2012

AbstractThe title compound is synthesized by Li+/H+ ion exchange of Li2Ti6O13 using benzoic acid (125 °C in air, 72 h).
ChemInform Abstract: Synthesis, Crystal Structures, and Hydrogen‐Storage Properties of Eu(AlH4)2 and Sr(AlH4)2 and of Their Decomposition Intermediates, EuAlH5 and SrAlH5.
Authors: Pommerin Andre , Wosylus Aron , Felderhoff Michael , Schueth Ferdi , Weidenthaler Claudia 
Published: May 2012

AbstractEu(AlH4)2 and Sr(AlH4)2 are prepared by ball milling of stoichiometric mixtures of NaAlH4 and europium or strontium chloride and characterized by powder XRD and 27Al NMR spectroscopy.
ChemInform Abstract: Rich Coordination of Nd3+ in Mg2Nd13(BO3)8 (SiO4)4(OH)3, Derived from High‐Pressure/High‐Temperature Conditions.
Authors: Wu Shijun , Kegler Philip , Wang Shuao , Holzheid Astrid , Depmeier Wulf , Malcherek Thomas , Alekseev Evgeny V. , Albrecht‐Schmitt Thomas E. 
Published: May 2012

AbstractThe title compound is prepared by solid state reaction of MgO, Nd2O3, H3BO3, and SiO2 in the ratio of Mg:Nd:B:Si = 2:13:8:4 (Pt capsule, 4.5 GPa, 1400 °C, 1 h).
ChemInform Abstract: Na2EuAs2S5, NaEuAsS4, and Na4Eu(AsS4)2: Controlling the Valency of Arsenic in Polysulfide Fluxes.
Authors: Bera Tarun K. , Kanatzidis Mercouri G. 
Published: May 2012

AbstractDepending on the relative As content and the basicity of the polysulfide flux, either the AsV compounds (V) and (VI) or the AsIII compound (VII) are obtained.
ChemInform Abstract: Thorium(IV)—Selenate Clusters Containing an Octanuclear Th(IV) Hydroxide/Oxide Core.
Authors: Knope Karah E. , Vasiliu Monica , Dixon David A. , Soderholm L. 
Published: May 2012

Abstract[Th8(μ3‐O)4 (μ2‐OH)8(H2O)15 (SeO4)8]·7.5H2O (I) and [Th8(O)4(OH)8(H2O)17 (SeO4)8]·nH2O (II) are obtained from an aqueous slurry of Th(NO3)4, NH4OH, and H2SeO4 (boiling on a hot plate for about 10 min).
ChemInform Abstract: Highly Tunable Arylated Cinchona Alkaloids as Bifunctional Catalysts.
Authors: Quigley Cormac , Rodriguez‐Docampo Zaida , Connon Stephen J. 
Published: May 2012

AbstractA variety of novel chinchona alkaloid‐derived organocatalysts is synthesized with the aim of rationally designing a library of catalysts in which the relative proximity and orientation of the catalytically relevant components can be modified systematically.
ChemInform Abstract: Catalytic anti‐Selective Asymmetric Henry (Nitroaldol) Reaction Catalyzed by Cu(I)—Amine—Imine Complexes.
Authors: Ji Yao Qiong , Qi Gao , Judeh Zaher M. A. 
Published: May 2012

AbstractThe complex derived from bisisoquinoline BIQ and CuCl effectively catalyzes the title reaction of both aromatic and aliphatic aldehydes in the presence of moisture and air to give the resulting nitroalcohols with moderate antiselectivity.
ChemInform Abstract: Dimethyl Carbonate in the Regio‐ and Stereocontrolled Opening of Three‐Membered Heterocyclic Rings.
Authors: Righi Giuliana , Bovicelli Paolo , Barontini Maurizio , Tirotta Ilaria 
Published: May 2012

AbstractHarmful or carcinogenic solvents such as CH2Cl2, Et2O, MeCN or acetone can be successfully replaced by the more eco‐friendly medium dimethylcarbonate in nucleophilic ring‐opening reactions of oxiranes and aziridines.
ChemInform Abstract: Solvent‐Free Copper‐Catalyzed N‐Arylation of Amino Alcohols and Diamines with Aryl Halides.
Authors: Yin Huiqing , Jin Ming , Chen Wei , Chen Chen , Zheng Likang , Wei Ping , Han Shiqing 
Published: May 2012

AbstractA simple method for C—N cross‐coupling of aryl halides and primary amines is developed.
ChemInform Abstract: CDI‐Mediated Monoacylation of Symmetrical Diamines and Selective Acylation of Primary Amines of Unsymmetrical Diamines.
Authors: Verma Sanjeev K. , Ghorpade Ramarao , Pratap Ajay , Kaushik M. P. 
Published: May 2012

AbstractA convenient two‐step one‐pot procedure is developed for the preparation of carbamates (IV) and amides (V), (IX), (XI), and (XIV).
ChemInform Abstract: Ni‐Catalyzed, Domino Synthesis of Tertiary Alcohols from Secondary Alcohols.
Authors: Berini Christophe , Navarro Oscar 
Published: May 2012

AbstractThe use of an in situ generated N‐heterocyclic carbene allows for the synthesis of a variety of tertiary alcohols (III) from secondary alcohols (I) through a domino oxidation—addition protocol.
ChemInform Abstract: Modular Furanoside Pseudodipeptides and Thioamides, Readily Available Ligand Libraries for Metal‐Catalyzed Transfer Hydrogenation Reactions: Scope and Limitations.
Authors: Coll Mercedes , Ahlford Katrin , Pamies Oscar , Adolfsson Hans , Dieguez Montserrat 
Published: May 2012

AbstractTwo libraries containing 72 D‐xylose or D‐glucose derived pseudodipetides and thioamides, respectively are prepared as ligands for catalytic asymmetric transfer hydrogenation.
ChemInform Abstract: Chiral 2‐Aminobenzimidazole Bifunctional Organocatalysts: Effect of Di‐CF3 and TFA on Catalytic Mechanisms.
Authors: Lee Myungmo , Zhang Lei , Park Yohan , Park Hyeung‐geun 
Published: May 2012

AbstractBIM is synthesized and applied to Michael addition of diethyl malonate to nitroolefins.
ChemInform Abstract: Manganese Oxide‐Catalyzed Transformation of Primary Amines to Primary Amides Through the Sequence of Oxidative Dehydrogenation and Successive Hydration.
Authors: Wang Ye , Kobayashi Hiroaki , Yamaguchi Kazuya , Mizuno Noritaka 
Published: May 2012

AbstractThe dual catalytic functions of manganese oxide octahedral molecular sieves allow for the oxygenation of primary amines (I) to the corresponding amides (II).
ChemInform Abstract: Cyanuric Chloride Catalyzed Beckmann Rearrangement of Ketoximes in Biodegradable Ionic Liquids.
Authors: Maia Angelamaria , Albanese Domenico C. M. , Landini Dario 
Published: May 2012

AbstractThe Beckmann‐type rearrangement, that is known to require strongly acidic media, is carried out in the presence of imidazolium‐based ionic liquids containing ester moieties in the side chain.
ChemInform Abstract: Sulfo‐Click Reaction via in situ Generated Thioacids and Its Application in Kinetic Target‐Guided Synthesis.
Authors: Namelikonda Niranjan Kumar , Manetsch Roman 
Published: May 2012

AbstractA one‐pot variant of the sulfo‐click reaction in presented, in which protected thioesters (I) and (IV) are rapidly deprotected and further subjected to the reaction with sulfonylazides (II) and (V) to afford N‐acyl sulfonamides (III) and (VI), respectively.
ChemInform Abstract: Asymmetric Triple Cascade Organocatalytic Reaction in Water: Construction of Polyfunctional Cyclohexene Building Blocks Having Multiple Stereocenters.
Authors: Jia Yaomei , Mao Zhifeng , Wang Rui 
Published: May 2012

AbstractThe multicomponent reaction of a linear aldehyde, a nitroalkene, and an α,β‐unsaturated aldehyde in water affords cyclohexene derivatives bearing four stereogenic centers.
ChemInform Abstract: Synthesis of 1,2‐Naphthalenediol Diacetates by Rhodium(II)‐Catalyzed Reaction of 1,2‐Diazonaphthoquinones with Acetic Anhydride.
Authors: Kitamura Mitsuru , Kisanuki Masato , Okauchi Tatsuo 
Published: May 2012

AbstractConversion of quinone (VI) leads to the desired product (VII) in low yield and imidoyl acetate (VIII) is isolated as the major product.
ChemInform Abstract: Asymmetric Synthesis of Wieland—Miescher and Hajos—Parrish Ketones Catalyzed by an Amino Acid Derived Chiral Primary Amine.
Authors: Zhou Pengxin , Zhang Long , Luo Sanzhong , Cheng Jin‐Pei 
Published: May 2012

AbstractThe amine efficiently promotes the enantioselective formation of the title ketones and related compounds.
ChemInform Abstract: HOTf Mediated Cascade Reactions of 1‐Arenoylcyclopropanecarboxylic Acids with Arenes.
Authors: Chen Gen‐Qiang , Tang Xiang‐Ying , Shi Min 
Published: May 2012

AbstractTitle cascade reaction provides access towards benzofluorene derivatives (III) and (V) as single diastereomers.
ChemInform Abstract: Cascade Assembly of the Benz[a]anthraquinone Ring System Common to the Angucycline Antibiotics.
Authors: Baranczak Aleksandra , Sulikowski Gary A. 
Published: May 2012

AbstractA novel synthetic route to access compounds (X) and (XII), which represent the tetracyclic core structure of angucycline antiobiotics, is based on an optimized procedure for the desymmetrization of dibromide (III).
ChemInform Abstract: Regiodivergent Synthesis of Trisubstituted Furans Through Tf2O‐Catalyzed Friedel—Crafts Acylation: A Tool for Access to Tetrahydrofuran Lignan Analogues.
Authors: Comegna Daniela , DellaGreca Marina , Iesce M. Rosaria , Previtera Lucio , Zarrelli Armando , Zuppolini Simona 
Published: May 2012

AbstractA tunable Tf2O‐mediated Friedel—Crafts acylation allows the synthesis of 3‐ and 4‐aroylated phenylfurans such as (III) or (IV) from the unique mono‐acid precursor (I).
ChemInform Abstract: Highly Regioselective Migration of the Sulfonyl Group: Easy Access to Functionalized Pyrroles.
Authors: Xin Xiaoyi , Wang Dongping , Li Xincheng , Wan Boshun 
Published: May 2012

AbstractThe first example of sulfonyl group migration in pyrrole synthesis to give selectively the compounds (II), (III), and (V) is presented.
ChemInform Abstract: Influence of Steric Parameters on the Synthesis of Tetramates from α‐Amino‐β‐alkoxy‐esters and Ph3PCCO.
Authors: Loke Inga , Park Natja , Kempf Karl , Jagusch Carsten , Schobert Rainer , Laschat Sabine 
Published: May 2012

AbstractThe domino addition—Wittig cyclization sequence produces enantiomerically pure tetramate structures.
ChemInform Abstract: One‐Pot Reductive Coupling of N‐Acylcarbamates with Activated Alkenes: Application to the Asymmetric Synthesis of Pyrrolo[1,2‐a]azepin‐5‐one Ring System and (‐)‐Xenovenine.
Authors: Liu Xue‐Kui , Zheng Xiao , Ruan Yuan‐Ping , Ma Jie , Huang Pei‐Qiang 
Published: May 2012

AbstractA one‐pot method for the direct reductive coupling of N‐acylcarbamates with activated alkenes is based on the partial reduction with AlH(iBu)2, followed by acyliminium ion formation and SmI2‐mediated radical cross‐coupling with activated alkenes.
ChemInform Abstract: Asymmetric Synthesis of Highly Functionalized γ‐Lactams Through an Organocatalytic aza‐Michael—Michael Reaction Cascade Using Fumaric Acid Amide Esters as Multi‐Reactive Substrates.
Authors: Yokosaka Takuya , Hamajima Akinari , Nemoto Tetsuhiro , Hamada Yasumasa 
Published: May 2012

AbstractThe process employs primary and secondary amine organocatalysts allowing the synthesis of mono and bicyclic lactam frameworks.
ChemInform Abstract: Asymmetric Construction of Quaternary Stereocenters: Synthesis of Enantiopure Amino Acid‐Based Tricyclic α,β‐Enones Through an ipso‐Friedel—Crafts/Michael Addition Cascade.
Authors: Rodriguez‐Solla Humberto , Concellon Carmen , Tuya Paula , Garcia‐Granda Santiago , Rosario Diaz M. 
Published: May 2012

AbstractPhenylalanine‐derived syn‐amino epoxide (V*) shows a different behavior than the related compounds (I) and (III) according to a previously published study.
ChemInform Abstract: Regioselective Conversion of Alkynes to 4‐Substituted and 3,4‐Disubstituted Isoxazoles Using Titanium‐Catalyzed Multicomponent Coupling Reactions.
Authors: Dissanayake Amila A. , Odom Aaron L. 
Published: May 2012

AbstractA one‐pot method for the synthesis of the title compounds (III), (V), and (VII) is developed.
ChemInform Abstract: Practical Synthesis of β‐Oxo Benzo[d]thiazolyl Sulfones: Scope and Limitations.
Authors: Pospisil Jiri , Robiette Raphael , Sato Hitoshi , Debrus Kevin 
Published: May 2012

AbstractA short and efficient approach to α‐acyl and α‐carboxylic acid derived sulfones such as (III) or (V) is reported.
ChemInform Abstract: Regioselective Synthesis of 5‐Trifluoromethyl‐1,2,3‐triazoles via CF3‐Directed Cyclization of 1‐Trifluoromethyl‐1,3‐dicarbonyl Compounds with Azides.
Authors: Rozin Yury A. , Leban Johann , Dehaen Wim , Nenajdenko Valentine G. , Muzalevskiy Vasiliy M. , Eltsov Oleg S. , Bakulev Vasiliy A. 
Published: May 2012

AbstractA general and highly selective method for the synthesis of the title compounds (III) and (V), which are obtained as single isomer, is presented.
ChemInform Abstract: Synthesis and Antitumor Activity of a Novel Class of Flavanones: 1,4‐Diaryl‐1,4‐dihydrochromeno[4,3‐c]pyrazoles.
Authors: Chen Zhiwei , Wang Zhihua , Su Weike 
Published: May 2012

AbstractA novel and efficient method for the synthesis of new diaryldihydrochromenopyrazoles from corresponding flavanones is developed.
ChemInform Abstract: Intramolecular 1,3‐Dipolar Nitrile Oxide Cycloaddition Using Baylis—Hillman Derivatives: Stereoselective Synthesis of Tricyclic Chromenoisoxazolines.
Authors: Bakthadoss Manickam , Srinivasan Jayakumar , Selvakumar Raman 
Published: May 2012

AbstractThe title method provides the required heterocyclic systems (III) and (VI) in a stereoselective manner.
ChemInform Abstract: One‐Pot Synthesis of 4‐Substituted 3,4‐Dihydro‐3‐methoxyisocoumarins via Carboxylation of α‐Substituted 2‐Lithio‐β‐methoxystyrenes with Carbon Dioxide.
Authors: Kobayashi Kazuhiro , Nagaoka Toshiyuki , Shirai Yuu , Miyatani Wataru , Yokoi Yuki , Konishi Hisatoshi 
Published: May 2012

AbstractCarboxylation of α‐substituted 2‐lithio‐β‐methoxystyrenes followed by acid‐mediated lactonization opens a convenient route to the title compounds.
ChemInform Abstract: A New Synthesis of 5‐Arylbenzo[c]xanthones from Photoinduced Electrocyclization and Oxidation of (E)‐3‐Styrylflavones.
Authors: Rocha Djenisa H. A. , Pinto Diana C. G. A. , Silva Artur M. S. , Patonay Tamas , Cavaleiro Jose A. S. 
Published: May 2012

AbstractThe title compounds are of interest as structural motifs of natural products and as heterocyclic skeletons in drug development.