bluuebunny/crossref_metadata_2025_split huggingface dataset:
Metal‐Free Activation of Hydrogen, Carbon Dioxide, and Ammonia by the Open‐Shell Singlet Biradicaloid [P(μ‐NTer)]2
Authors: Hinz Alexander , Schulz Axel , Villinger Alexander 
Published: September 2016

AbstractThe Group 15 open‐shell singlet biradicaloid [P(μ‐NTer)]2 (Ter=2,6‐bis(2,4,6‐trimethylphenyl)phenyl) was utilized in the activation of stable small molecules. Fast reactions with H2, CO2, and NH3 were observed. Dihydrogen easily added to [P(μ‐NTer)]2 , yielding [HP(μ‐NTer)]2 under ambient conditions whereas reversible release of molecular hydrogen was observed at slightly elevated temperatures (T>60 °C). As [P(μ‐NTer)]2 is a species with phosphorus in the unusual formal oxidation state +II, it is capable of reducing carbon dioxide to afford a zwitterionic compound, [OP(μ‐NTer)2P], and carbon monoxide. The reaction of [P(μ‐NTer)]2 with ammonia led to the formation of an azadiphosphiridine after rearrangements of the central P2N2 heterocycle.
Efficient solid‐phase synthesis of acetylated lignin and a comparison of the properties of different modified lignins
Authors: Zhao Xiaohong , Huang Zuqiang , Zhang Yanjuan , Yang Mei , Chen Dong , Huang Kai , Hu Huayu , Huang Aimin , Qin Xingzhen , Feng Zhenfei 
Published: September 2016

ABSTRACTThe chemical modification of lignin can greatly enhance its functionality and exploit its application areas. To avoid the difficulties of separation and environmental pollution in the traditional liquid‐phase method, we prepared acetylated lignin by a mechanical‐activation‐assisted solid‐phase synthesis (MASPS) technology with a customized stirring ball mill as a reactor and studied its structure and properties. Ultraviolet–visible analysis showed that the degree of esterification (DE) of the acetylated lignin produced by the MASPS technique was 77.59%, whereas the DEs of those produced by traditional liquid‐phase synthesis (LPS) and thermal solid‐phase synthesis (TSPS) were only 42.29 and 27.54%, respectively. Fourier transform infrared spectroscopy and NMR analyses indicated that both phenolic hydroxyls and aliphatic hydroxyls participated in the reaction, and the reactivity of the phenolic hydroxyls was higher than that of the aliphatic hydroxyl groups. The acetylation of aliphatic hydroxyl mainly happened at the γ of arylglycerol‐β‐aryl ether (β‐O‐4). Scanning electron microscopy analysis showed that the acetylated lignins prepared by MASPS and TSPS were irregular blocks with coarse surfaces and loose structures, whereas the lignin prepared by LPS consisted mostly of regular balls with a smooth surface and a compact structure. Differential scanning calorimetry and thermogravimetric analyses indicated that the glass‐transition temperatures and thermal stability of the acetylated lignin increased by orders with the processing techniques of MASPS, TSPS, and LPS. MASPS integrated the activation and reaction in the same equipment without the use of a solvent and showed advantages of a high efficiency, environmental protection, and easy operation. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44276.
Nitroxide polymer brushes as efficient and recoverable catalysts for the selective oxidation of primary alcohols to aldehydes
Authors: Liu Shaojie , Wang Huali , Chu Xiaomeng 
Published: September 2016

ABSTRACT2,2,6,6‐Tetramethylpiperidinyloxyl (TEMPO)‐containing polymer brushes were grafted onto crosslinked polystyrene microspheres via surface‐initiated activators regenerated by electron transfer atom transfer radical polymerization (ARGET ATRP) of 2,2,6,6‐tetramethyl‐4‐piperidyl methacrylate, followed by an oxidation process with 3‐chloroperoxybenzoic acid as oxidant. The synthesized nitroxide polymer brushes included homopolymer brushes, block copolymer brushes, and random copolymer brushes with various TEMPO contents and molecular weights. They were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, nuclear magnetic resonance spectroscopy, and gel permeation chromatography. These nitroxide brushes bearing high TEMPO contents were used as recoverable catalysts for the hypochlorite and aerobic oxidation of primary alcohols to aldehydes. The effects of polymer brush structure on the catalytic properties were studied and discussed. The results showed that these nitroxide polymer brushes had excellent catalytic properties and good recycling performances. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44365.
The electropolymerization of several poly(3‐methylthiophene) films in the same used solution and its consequence in their properties
Authors: Correa Alessandra Alves , Gonçalves Roger , Pereira Rodrigo , Pereira Ernesto Chaves 
Published: September 2016

ABSTRACTThe effect of the electropolymerization of seven poly(3‐methylthiophene) (P3MT) films in the same used monomer solution have been investigated. Cyclic voltammetry, UV‐visible, scanning electron microscopy, and electrochemical impedance measurements were carried out to understand the effect of the solution reusing on the polymer electrochemical properties. The obtained results show that, as the solution is reused, the polymerization rate increase and the charge in of the cyclic voltammetry decrease. Besides, there are important changes in the sample's morphologies, with the increase of the synthesis number, the amount of fibers increase and this leads to lower the conductivity of the polymer film. In agreement to this, the impedance data analysis shown important changes in the interfacial electronic parameters, i.e., changer transfer resistance and double‐layer capacitance, used to describe the films. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44368.
Linkage between Rural Voters and Politicians: Effects on Rice Policies in the Philippines and Thailand
Authors: Fang Arnold H. 
Published: September 2016

AbstractThis article explains how linkages between politicians and rural voters affected the design of agricultural policies, using rice in two countries as examples. In the Philippines, colonial history bolstered an oligarchy of landed elite politicians, whose power was restored after the dictatorship of Marcos ended in 1986. Their practice of patronage brought corruption that led to dwindling rice productivity and increasing import dependence while displacing the political necessity to offer price support to farmers. In Thailand, sociopolitical development was more centralized, with new electoral rules introduced in 1997 to weaken locally confined patronage arrangements. Mass parties competing on a policy platform were favoured instead, resulting in increasing, but eventually, excessive subsidies for rice farmers. Although voter–politician linkages resulted in different rice policies in the two countries, recent instability in the world rice market showed that strategies with greater sustainability considerations are needed in addressing domestic income disparities and global food insecurity.
Pd‐Catalyzed Cyclocarbonylation of 2‐(2‐Bromoaryl)indoles with CO as a C1 Source: Selective Access to 6 H‐Isoindolo[2,1‐a]indol‐6‐ones and Indeno[1,2‐b]indol‐10(5 H)‐ones
Authors: Guo Shenghai , Tao Li , Wang Fang , Fan Xuesen 
Published: September 2016

AbstractA highly efficient and regioselective synthetic route to 6 H‐isoindolo[2,1‐a]indol‐6‐ones and indeno[1,2‐b]indol‐10(5 H)‐ones through the Pd‐catalyzed cyclocarbonylation of 2‐(2‐bromoaryl)indoles under atmospheric CO pressure has been achieved. Notably, the regioselectivity of the reaction was exclusively dependent on the structural characteristics of the indole substrates. With N‐unsubstituted indoles as the starting materials, the reaction afforded 6H‐isoindolo[2,1‐a]indol‐6‐ones in good‐to‐excellent yields. On the other hand, with N‐substituted indoles as the substrates, the reaction gave indeno[1,2‐b]indol‐10(5 H)‐ones in a highly regioselective manner.
Treatment and imaging of intracranial atherosclerotic stenosis: current perspectives and future directions
Authors: van den Wijngaard Ido R. , Holswilder Ghislaine , van Walderveen Marianne A. A. , Algra Ale , Wermer Marieke J. H. , Zaidat Osama O. , Boiten Jelis 
Published: September 2016

AbstractBackground and PurposeIntracranial atherosclerosis is a common cause of stroke worldwide. It results in ischemic stroke due to different mechanisms including artery‐to‐artery embolism, in situ thrombo‐occlusion, occlusion of perforating arteries, and hemodynamic failure. In this review, we present an overview of current treatment and imaging modalities in intracranial atherosclerotic stenosis.MethodsPubMed was searched for relevant articles in English that evaluated the treatment and imaging of intracranial atherosclerotic stenosis (ICAS).ResultsAggressive medical management, consisting of dual antiplatelet therapy and intensive risk factor management, is important in patients with ICAS because of a substantial risk of recurrent stroke, approximately 20% in the first year, in patients on aspirin or warfarin alone. Recent trials have suggested that, aggressive medical therapy results in better outcome as compared with intracranial stenting. However, the question remains what the optimal treatment strategy would be in patients with recurrent strokes in the setting of failed aggressive medical therapy. Moreover, controversy exists whether a subgroup of patients with symptomatic ICAS could benefit from intracranial stenting if selection is based on radiological evidence of hemodynamic failure. With regard to imaging, transcranial Doppler ultrasound and magnetic resonance angiography are useful screening tests for exclusion of ICAS, but need confirmation by other imaging modalities when stenosis is suggested. Computed tomography angiography has a high positive and negative predictive value for detection of intracranial luminal stenosis of 50% or higher, but performs worse than digital subtraction angiography with regard to establishing the exact degree of luminal stenosis. Novel imaging techniques including high‐resolution CT and MRI better identify plaque characteristics than conventional imaging methods.ConclusionsCurrently, aggressive medical management remains the standard of care for patients with ICAS. Further research is needed to identify high‐risk subgroups and to develop more effective treatments for ICAS patients.
A ‐1573T>C SNP within the human TRAIL promoter determines TRAIL expression and HCC tumor progression
Authors: Piras‐Straub Katja , Khairzada Khaleda , Kocabayoglu Peri , Paul Andreas , Gerken Guido , Herzer Kerstin 
Published: September 2016

AbstractThe cytokine tumor necrosis factor (TNF)‐related apoptosis‐inducing ligand (TRAIL) induces apoptosis in liver cancer cells but not in normal liver cells. Therefore, TRAIL got credited to play a role in hepatocellular carcinoma (HCC) development and progression. Impaired expression of TRAIL in HCC cells and sequence variations in the TRAIL promoter may facilitate development, growth, and spread . The TRAIL promoter was sequenced from liver tissue of 93 patients undergoing partial liver resection (PRT) or liver transplantation (LT) for HCC. TRAIL mRNA expression was investigated by quantitative real‐time PCR. A variant ‐1573T>C (single‐nucleotide polymorphism; C, cytosine) SNP was characterized by electron mobility shift assay and supershift assays. Functionality of the ‐1573T>C SNP was analyzed in reporter gene assays and cell migration assays. In approximately 30% of HCC samples, a loss‐of‐function shift of the binding pattern due to a ‐1573T>C SNP was found within the human TRAIL promoter. Correlation analysis revealed significantly lower TRAIL expression in HCC samples with the ‐1573C sequence (P ≤ 0.05). Reporter gene assays revealed significantly reduced inducibility of the TRAIL promoter due to the ‐1573C sequence. The variant ‐1573C sequence impaired not only binding of transcription factors but also expression of TRAIL. Interestingly, this impairment resulted in enhanced migration activity and colony formation of the liver tumor cells. Our findings suggest that loss of function of the human TRAIL promoter due to the ‐1573T>C SNP leads to reduced expression and impaired inducibility of TRAIL, with the consequence of enhanced growth and migration of tumor cells, ultimately resulting in the progression of the HCC.
Fabrication and Application of Isotopically Labelled Gold Arrays for Multiplexed Peptide Analysis
Authors: Castangia Roberto , Hudson Siân R. , Robinson Helen K. , Flitsch Sabine L. , Thomas‐Oates Jane , Routledge Anne 
Published: September 2016

AbstractA new array‐based technology for the simultaneous capture, chemical labelling and mass spectrometry analysis of peptides is presented. Isotopically labelled self‐assembled monolayer (SAM) gold arrays are constructed and used simultaneously to capture and label a range of peptides. The array‐immobilised, labelled peptides were released by MALDI ablation, analysed by MALDI mass spectrometry and readily identified as labelled peptides from their characteristic isotope pattern. This new solid‐phase array platform has the advantage of minimal sample manipulation and is suitable for multiple analyses of single protein digests on a single MALDI target plate.
ChemInform Abstract: Halide Free M(BH4)2 (M: Sr, Ba, and Eu) Synthesis, Structure, and Decomposition.
Authors: Sharma Manish , Didelot Emilie , Spyratou Alexandra , Lawson Daku Latevi Max , Cern� Radovan , Hagemann Hans 
Published: September 2016

AbstractThe title compounds are prepared from mixtures of ball milled MH2 (M: Sr, Ba, Eu) and excess Et3NBH3 (100 °C for 24 h and 145 °C for 5 h).
ChemInform Abstract: Negative Thermal Expansion and Low‐Temperature Heat Capacity Anomalies of Ge31P15Se8 Semiclathrate.
Authors: Novikov V. V. , Matovnikov A. V. , Mitroshenkov N. V. , Shevelkov A. V. 
Published: September 2016

AbstractPolycrystalline Ge31P15Se8 samples are prepared by solid state reaction of stoichiometric amounts of Ge, red P, and Se (evacuated silica tubes, 874 K, 8 d).
ChemInform Abstract: Trigonal Planar [HgSe3]4‐ Unit: A New Kind of Basic Functional Group in IR Nonlinear Optical Materials with Large Susceptibility and Physicochemical Stability.
Authors: Li Chao , Yin Wenlong , Gong Pifu , Li Xiaoshuang , Zhou Molin , Mar Arthur , Lin Zheshuai , Yao Jiyong , Wu Yicheng , Chen Chuangtian 
Published: September 2016

AbstractSingle crystals of BaHgSe2 are grown from an equimolar mixture of HgSe and BaSe (evacuated silica tubes, 850 °C, 72 h).
ChemInform Abstract: Magnetic Evolution of Spinel Mn1‐xZnxCr2O4 Single Crystals.
Authors: Lin G. T. , Luo X. , Pei Q. L. , Chen F. C. , Yang C. , Song J. Y. , Yin L. H. , Song W. H. , Sun Y. P. 
Published: September 2016

AbstractMn1‐xZnxCr2O4 (x = 0—1) single crystals are grown from the polycrystalline material by chemical vapor transport with CrCl3 as the transport agent (quartz tubes, 1060→1015 °C, 10 d; cooling rate of 15 °C/h).
ChemInform Abstract: Layered‐to‐Tunnel Structure Transformation and Oxygen Redox Chemistry in LiRhO2 Upon Li Extraction and Insertion.
Authors: Mikhailova Daria , et al.  
Published: September 2016

AbstractUpon delithiation of the layered positive electrode material for Li ion batteries, LiRhO2 shows migration of Rh cations towards empty octahedral positions in the Li layers, resulting in the LiyRh3O6 phase with a rutile—ramsdellite intergrowth structure.
ChemInform Abstract: Historical Pigment Exhibiting Ammonia Gas Capture Beyond Standard Adsorbents with Adsorption Sites of Two Kinds.
Authors: Takahashi Akira , Tanaka Hisashi , Parajuli Durga , Nakamura Tohru , Minami Kimitaka , Sugiyama Yutaka , Hakuta Yukiya , Ohkoshi Shin‐ichi , Kawamoto Tohru 
Published: September 2016

AbstractPolycrystalline samples of Prussian blue (K0.23Fe[Fe(CN)6]0.74) (I), Cu[Fe(CN)6]0.5 (II), and Co2[Co(CN)6]0.6 (III) are prepared by precipitation in a micromixer using e.g. a 0.16 mol/L Fe(NO3)3 and a 0.12 mol/L K2[Fe(CN)6] solution at a flow speed of 50 mL/min for pigment (I).
ChemInform Abstract: Ammine Complexes of Na‐, Ag‐, Mn‐, and Zn‐Azides.
Authors: Mueller Thomas G. , Buchner Magnus R. , Scheubeck Thomas J. , Korber Nikolaus , Kraus Florian 
Published: September 2016

AbstractColorless crystals of [Ag(NH3)3]N3 are obtained from saturated solutions of AgN3 in dry liq.
ChemInform Abstract: AlNbBr8 — Preparation, Crystal Structure, and Vapor Pressure Studies.
Authors: Rogachev Alexander V. , Zelenina Ludmila N. , Chusova Tamara P. , Virovets Alexander V. , Sokolov Maxim N. 
Published: September 2016

AbstractRed crystals of AlNbBr8 are prepared by degradation of Nb2S4Br4 in AlBr3 and [emim]Br under Ar (150 °C, 48 h) followed by dilution in benzene (4 °C, several d).
ChemInform Abstract: Chiral Ferrocenyl P,S‐Ligands for Highly Efficient Copper‐Catalyzed Asymmetric [3 + 2] Cycloaddition of Azomethine Ylides
Authors: Han Fu‐Zhong , Yu Sai‐Bo , Zhang Cheng , Hu Xiang‐Ping 
Published: September 2016

Abstractwith various electron‐deficient olefins giving pyrrole‐type cycloadducts in high endo‐selectivities and excellent enantioselectivities
ChemInform Abstract: Enantioselective Addition of Organozinc Reagents to Carbonyl Compounds Catalyzed by a Camphor Derived Chiral γ‐Amino Thiol Ligand.
Authors: Wu Hsyueh‐Liang , Wu Ping‐Yu , Cheng Ying‐Ni , Uang Biing‐Jiun 
Published: September 2016

AbstractThe CDAT‐catalyzed enantioselective addition of dialkylzinc to aldehydes (I) and ketoesters (X) leads to corresponding alcohols (III) and (XII), respectively.
ChemInform Abstract: Palladium‐Catalyzed Dearomatizing Difunctionalization of Indoles and Benzofurans.
Authors: Ramella Vincenzo , He Zhiheng , Daniliuc Constantin G. , Studer Armido 
Published: September 2016

AbstractA Pd‐catalyzed coupling of benzofurans or indoles having a carboxylic or hydroxyalkyl side chain at C‐2 with arylboronic acids results in concomitant dearomatizing cyclization to produce syn‐lactone derivatives or analogous cyclic ethers.
ChemInform Abstract: Novel Transition Bimetal—Organic Frameworks: Recyclable Catalyst for the Oxidative Coupling of Primary Amines to Imines at Mild Conditions.
Authors: Ge Danhua , Qu Genlong , Li Xinming , Geng Kaiming , Cao Xueqin , Gu Hongwei 
Published: September 2016

AbstractA new and simple heterogeneous catalyst for promoting the oxidative coupling of benzylamines to the corresponding imines is developed.
ChemInform Abstract: Striking Difference Between Succinimidomethyl and Phthalimidomethyl Radicals in Conjugate Addition to Alkylidenemalonate Initiated by Dimethylzinc.
Authors: Yamada Ken‐ichi , Matsumoto Yusuke , Fujii Shintaro , Konishi Takehito , Yamaoka Yousuke , Takasu Kiyosei 
Published: September 2016

AbstractWhereas succinimidomethyl radicals undergo monoaddition onto aryl or alkyl substituted alkylidenemalonates, phthalimidomethyl radicals form a mixture of products resulting from mono and double addition.
ChemInform Abstract: Regio‐ and Enantioselective Synthesis of Azole Hemiaminal Esters by Lewis Base Catalyzed Dynamic Kinetic Resolution.
Authors: Piotrowski David W. , Kamlet Adam S. , Dechert‐Schmitt Anne‐Marie R. , Yan Jiangli , Brandt Thomas A. , Xiao Jun , Wei Liuqing , Barrila Mark T. 
Published: September 2016

AbstractA modular three‐component dynamic kinetic resolution which affords enantiomerically enriched hemiaminal esters derived from azoles and aldehydes is used to synthesize valuable substituted azoles in a regioselective manner by capping of the equilibrating azole‐aldehyde adduct.
ChemInform Abstract: Enantioselective Intermolecular Enamide—Aldehyde Cross‐Coupling Catalyzed by Chiral N‐Heterocyclic Carbenes.
Authors: Wu Jicheng , Zhao Changgui , Wang Jian 
Published: September 2016

AbstractAn unprecedented N‐heterocyclic carbene‐catalyzed intermolecular cross‐coupling of electron‐rich enamides and aromatic aldehydes is described.
ChemInform Abstract: Ligand‐Promoted, Boron‐Mediated Chemoselective Carboxylic Acid Aldol Reaction.
Authors: Nagai Hideoki , Morita Yuya , Shimizu Yohei , Kanai Motomu 
Published: September 2016

AbstractThe first carboxylic acid selective aldol reaction mediated by boron compounds is developed.
ChemInform Abstract: Rh‐Catalyzed Stereospecific Synthesis of Allenes from Propargylic Benzoates and Arylboronic Acids.
Authors: Ruchti Jonathan , Carreira Erick M. 
Published: September 2016

AbstractThe first example of a rhodium catalyzed synthesis of optically active trisubstituted allenes from propargylic alcohol derivatives and arylboronic acid is presented.
ChemInform Abstract: An Efficient, Stable and Reusable Palladium Nanocatalyst: Chemoselective Reduction of Aldehydes with Molecular Hydrogen in Water.
Authors: Kotha Surya Srinivas , Sharma Nidhi , Sekar Govindasamy 
Published: September 2016

AbstractPd‐nanoparticles stabilized by a binaphthyl‐backbone are used for the chemoselective reduction of aldehydes to give the corresponding benzylic alcohols.
ChemInform Abstract: Base‐Mediated Cyclization Reaction of 2‐(5‐Hydroxy‐1‐pentynyl)benzonitriles to 4‐Amino‐2,3‐dihydronaphtho[2,3‐b]furanes and Synthesis of Furanonaphthoquinones.
Authors: Tsai Chih‐Jyun , Chen Chin‐Chau , Tsai Chih‐Wei , Wu Ming‐Jung 
Published: September 2016

AbstractA three‐step synthesis of furanonaphthoquinones is described consisting of the title cyclization and subsequent oxidation of the products followed by dehydrogenation.
ChemInform Abstract: Photocatalytic Reaction of Diazo Compounds with Aldehydes.
Authors: Rybicka‐Jasinska K. , Ciszewski L. W. , Gryko D. 
Published: September 2016

AbstractPhotocatalytic reactions of diazoacetates with various aldehydes in the presence of a dual catalytic system lead to α‐alkylated carbonyl compounds instead of the expected cyclopropane derivatives.
ChemInform Abstract: Iron(III) Phthalocyanine‐Chloride‐Catalyzed Synthesis of Sulfones from Sulfonylhydrazones.
Authors: Zhao Jun‐Long , Guo Shi‐Huan , Qiu Jun , Gou Xiao‐Feng , Hua Cheng‐Wen , Chen Bang 
Published: September 2016

AbstractThe decomposition of tosylhydrazones in the presence of a Fe(III)phthalocyanine catalyst affords the corresponding sulfones.
ChemInform Abstract: Synthesis of Monosubstituted Thioureas by Vapour Digestion and Mechanochemical Amination of Thiocarbamoyl Benzotriazoles.
Authors: Dud Mateja , Magdysyuk Oxana V. , Margetic Davor , Strukil Vjekoslav 
Published: September 2016

AbstractHighly deactivated anilines, such as 4‐nitro and 4‐cyano are not applicable as substrates.
ChemInform Abstract: Facile Suzuki—Miyaura Coupling of Activated Aryl Halides Using New CpNiBr(NHC) Complexes.
Authors: Malan Frederick P. , Singleton Eric , van Rooyen Petrus H. , Landman Marile 
Published: September 2016

AbstractNine new Ni(II)‐NHC complexes are synthesized.
ChemInform Abstract: C60‐Catalyzed Direct C—H Arylation of Benzene with Aryl Iodides in Air.
Authors: Kwok Tsz Yiu , Sonnenschein Christoph , To Ching Tat , Liu Jianwen , Chan Kin Shing 
Published: September 2016

AbstractThe reactions proceed by in situ formation of C60(OH)2·‐ which reduces the aryl iodides to the corresponding aryl radicals which in turn arylate benzene.
ChemInform Abstract: Facile Synthesis of Polyaromatic Bisarylethynes Using a Diborylethyne Synthon.
Authors: Jung Daero , Kang Youn Kyung 
Published: September 2016

AbstractPd‐catalyzed Suzuki‐Miyaura cross‐coupling reactions between aryl halides and a diborylethylene synthon are adapted for the synthesis of polyaromatic bisarylethynes in high yields.
ChemInform Abstract: Enantioselective Synthesis of Ring‐Fused Spiroannulated 1,2,3‐Thiadiazole Derivatives.
Authors: Zeng Xue‐Mei , Xie Jian‐Wu 
Published: September 2016

AbstractThe domino reaction between thioamides and azodicarboxylates provides the products in high yields and with high enantiomeric excesses.
ChemInform Abstract: Discovery and Development of a Three‐Component Oxidopyrylium [5 + 2] Cycloaddition.
Authors: D'Erasmo Michael P. , Meck Christine , Lewis Chad A. , Murelli Ryan P. 
Published: September 2016

Abstractα‐Hydroxy‐γ‐pyrone‐derived oxidopyrilium dimers react with alcohols to form oxidopyrilium species which undergo cycloaddition reactions with various terminal or internal alkynes, thus delivering oxabicyco[3.2.1]octanes in moderate yields.