bluuebunny/crossref_metadata_2025_split huggingface dataset:
ChemInform Abstract: Ethyl Glyoxylate N‐Tosylhydrazone as Sulfonyl‐Transfer Reagent in Base‐Catalyzed Sulfa‐Michael Reactions.
Authors: Fernandez Maitane , Uria Uxue , Orbe Lucia , Vicario Jose L. , Reyes Efraim , Carrillo Luisa 
Published: May 2014

AbstractEthyl glyoxylate N‐tosylhydrazone (IIa) is identified as an excellent sulfonyl anion surrogate in the DBU‐catalyzed conjugate addition reaction with enones and enals for the synthesis of functionalized sulfones.
ChemInform Abstract: One‐Pot Transformation of Ph2P(O)‐Protected Ethynes: Deprotection Followed by Transition Metal‐Catalyzed Coupling.
Authors: Peng Lifen , Xu Feng , Suzuma Yoshinori , Orita Akihiro , Otera Junzo 
Published: May 2014

AbstractPh2P(O) is found to be a useful protecting group for ethynes.
ChemInform Abstract: Enantioselective Organocatalytic Synthesis of Sulfur‐Containing Spirocyclic Compounds.
Authors: Geant Pierre‐Yves , Urban Michal , Remes Marek , Cisarova Ivana , Vesely Jan 
Published: May 2014

AbstractTwo different enantioselective organocatalytic cascade reactions to form new sulfur‐containing spirocyclic scaffolds are described.
ChemInform Abstract: Enantio‐ and Diastereoselective Assembly of Tetrahydrofuran and Tetrahydropyran Skeletons with All‐Carbon‐Substituted Quaternary Stereocenters.
Authors: Chen Zhilong , Sun Jianwei 
Published: May 2014

AbstractThe cyclic acetal products can be transformed into other chiral building blocks with all‐carbon‐substituted stereocenters which are difficult to access using other methods.
ChemInform Abstract: Cycloaddition Reactions of Azide, Furan, and Pyrrole Units with Benzynes Generated by the Hexadehydro‐Diels—Alder (HDDA) Reaction.
Authors: Hoye Thomas R. , Chen Junhua , Baire Beeraiah 
Published: May 2014

AbstractDienes (IV) and (VI) are used in a 5‐10 fold excess which can be recovered in case of (IVb) and (VIa,b) upon chromatic purification of the products.
ChemInform Abstract: Lewis Acid Catalyzed Diastereoselective 1,3‐Dipolar Cycloaddition Between Diazoacetoacetate Enones and Azomethine Ylides.
Authors: Doyle Michael P. , Truong Phong M. , Mandler Michael D. , Shanahan Charles S. 
Published: May 2014

AbstractThe cycloaddition reaction proceeds with nearly complete diastereoselectivity.
ChemInform Abstract: Iron‐Catalyzed Arylalkoxycarbonylation of N‐Aryl Acrylamides with Carbazates.
Authors: Xu Xiangsheng , Tang Yucai , Li Xiaoqing , Hong Guo , Fang Mingwu , Du Xiaohua 
Published: May 2014

AbstractA novel arylalkoxycarbonylation of N‐aryl acrylamides with carbazates leading to alkoxycarbonylated oxindoles is developed.
ChemInform Abstract: An Approach to the Synthesis of Novel Dihydroindoles Bearing Electron‐Withdrawing Groups at C‐2 Position.
Authors: Maruoka Hiroshi , Okabe Fumi , Takasu Masaru , Masumoto Eiichi , Fujioka Toshihiro , Yamagata Kenji 
Published: May 2014

Abstract8 Title compounds of type (VI) are prepared.
ChemInform Abstract: Synthesis of 4‐Amino‐, 4‐Hydroxy‐, and 4‐Nitro‐1,3,4,5‐tetrahydrobenz[cd]indoles and Its Bromination.
Authors: Somei Masanori , Nakagawa Kyoko , Aoki Naokatsu , Mukaiyama Harunobu 
Published: May 2014

AbstractA simple synthetic method for 4‐nitro‐1,3,4,5‐tetrahydrobenz[cd]indole (V) is established.
ChemInform Abstract: Photochemical Reactions of Prop‐2‐enyl and Prop‐2‐ynyl Substituted 4‐Aminomethyl‐ and 4‐Oxymethyl‐2(5H)‐furanones.
Authors: Bach Thorsten , Fort Diego , J. Woltering Thomas A. , Alker Andre M. 
Published: May 2014

AbstractThe photoreaction of (Ia) can be performed on a gram scale.
ChemInform Abstract: Synthetic Approaches to 3,3′‐Biindolyl and 3,3′‐Biindazolyl Derivatives.
Authors: Bergman Jan , Nakhai Azadeh 
Published: May 2014

AbstractBiindolyl derivative (V) is synthesized by oxidative coupling of N‐acetylindole (III), while attempt to use the same reaction conditions for synthesis of biindazolyl derivative (XII) fails.
ChemInform Abstract: Diastereoselective Lithiation of N‐Silyl‐Protected (S)‐Tetrahydro‐1H‐pyrrolo[1,2‐c]imidazol‐3(2H)‐one.
Authors: Metallinos Costa , Sadraei Seyed Iraj , Zhukovskaya Nadezda 
Published: May 2014

AbstractL‐Proline‐derived imidazolone (I) undergoes diastereoselective lithiation—substitution to give 5‐substituted products (III) that may be easily converted to ureas (IV).
ChemInform Abstract: Synthesis of Tetrahydroquinolines Through Intramolecular Carbolithiation Reactions.
Authors: Sotomayor Nuria , Garcia‐Calvo Oihane , Martinez‐Estibalez Unai , Lete Esther 
Published: May 2014

AbstractWhen (‐)‐sparteine is used as chiral ligand low levels of enantioselectivity are obtained.
ChemInform Abstract: Formation of Xanthone Oxime and Related Compounds Using a Combination of tert‐Butyl Nitrite and Potassium Hexamethyldisilazide.
Authors: Tokuyama Hidetoshi , Cho Hidetsura , Iwama Yusuke , Noro Takahiro , Okano Kentaro 
Published: May 2014

AbstractThe method is effective for the synthesis of xanthone, thioxanthone, acridone, and anthrone oximes, which are difficult to obtain by conventional dehydrative condensation of corresponding ketones.
ChemInform Abstract: Iminium Ion—Enamine Cascade Cyclizations: Facile Access to Structurally Diverse Azacyclic Compounds and Natural Products.
Authors: Hanessian Stephen , Chattopadhyay Amit Kumar 
Published: May 2014

AbstractThe applicability of the title cascade reaction is demonstrated on the total synthesis of (+)‐ipalbidine (VIIb) and (+)‐julandine (XII).
ChemInform Abstract: Converting Cycloalkanones into N‐Heterocycles: Formal Synthesis of (‐)‐Gephyrotoxin 287C.
Authors: Pichette Simon , Winter Dana K. , Lessard Jean , Spino Claude 
Published: May 2014

AbstractKey step in the synthesis of Kishi′s intermediate (VIII) on the way to the natural alkaloid gephyrotoxin 287C (IX) is the combination of Beckmann ring expansion and photochemical ring contraction to convert cyclopentanone (I) into pyrrolidine (VI) stereospecifically.
ChemInform Abstract: One‐Pot Synthesis of Novel 2‐(Thiazol‐2‐yl)‐4,5‐dihydropyridazin‐3(2H)‐one Derivatives Catalyzed by Activated KSF.
Authors: Mahmoodi Nosrat O. , Safari Niloufar , Sharifzadeh Bahman 
Published: May 2014

AbstractA convenient, simple, efficient, chemo‐ and regioselective one‐pot, three‐component synthesis of the title compounds (IV) (12 examples) is developed.
ChemInform Abstract: Synthesis of Novel 5‐Aryl/Hetarylidenyl 3‐(2‐Methyl‐5,6,7,8‐tetrahydrobenzo[4,5]thieno [2,3‐d]pyrimidin‐4‐yl)‐2‐thioxothiazolidin‐4‐ones.
Authors: Biehl Edward R. , Mendoza Kimberly , Kamila Sukanta 
Published: May 2014

AbstractKnoevenagel condensation of thiazole (I) with various (het)aryl aldehydes gives the title compounds in high yields either under microwave irradiation or under conventional heating.
ChemInform Abstract: BF3·Etherate‐Mediated Friedel—Crafts Arylation of 2‐Hydroxy‐1,4‐benzoxazines: Synthesis of 2‐Aryl‐1,4‐benzoxazine Derivatives.
Authors: Naganaboina Ram Tilak , Peddinti Rama Krishna 
Published: May 2014

AbstractThe title reaction allows a simple, mild, and efficient access to a wide range of biologically interesting 2‐arylated 1,4‐benzoxazine derivatives.
ChemInform Abstract: Route to Benzo‐ and Pyrido‐Fused 1,2,4‐Triazinyl Radicals via N′‐(Het)aryl‐N′‐[2‐nitro(het)aryl]hydrazides.
Authors: Berezin Andrey A. , Zissimou Georgia , Constantinides Christos P. , Beldjoudi Yassine , Rawson Jeremy M. , Koutentis Panayiotis A. 
Published: May 2014

AbstractA two‐step route to 1,3‐disubstituted benzo‐ and pyrido‐fused 1,2,4‐triazinyl radicals is presented.
ChemInform Abstract: Gold(I)‐Catalyzed endo‐Selective Intramolecular α‐Alkenylation of β‐Yne‐Furans: Synthesis of Seven‐Membered‐Ring‐Fused Furans and DFT Calculations.
Authors: Dong Zhe , Liu Cheng‐Hang , Wang Yi , Lin Mu , Yu Zhi‐Xiang 
Published: May 2014

AbstractSix‐membered‐ring‐fused furans can also be obtained through exo‐selective cyclization for substrates with terminal alkynes [(XIII) and (XVIIa)] and alkynes bearing a CO2Me group [(XVIIb) and (XVIIc)].
ChemInform Abstract: A Convergent, Modular Approach to Functionalized 2,1‐Borazaronaphthalenes from 2‐Aminostyrenes and Potassium Organotrifluoroborates.
Authors: Wisniewski Steven R. , Guenther Courtney L. , Argintaru O. Andreea , Molander Gary A. 
Published: May 2014

AbstractA convergent approach is developed to synthesize disubstituted 2,1‐borazaronaphthalenes from N‐substituted 2‐aminostyrenes and potassium organotrifluoroborates, where the potassium organotrifluoroborate is converted to the active R—BX2 species (X = Cl or F) in situ by addition of a fluorophile.
ChemInform Abstract: Palladium‐Catalyzed Borylation of Aryl Iodides with 2,3‐Dihydro‐1H‐benzo[d][1,3,2]diazaboroles.
Authors: Murata Miki , Hirai Nobuyoshi , Okuyama Michihiro , Namikoshi Takeshi , Watanabe Shinji 
Published: May 2014

AbstractThe borylated products (III) and (V) can be readily converted to the corresponding boronic acids under acidic conditions.
ChemInform Abstract: Triterpenoid Saponins from the Roots of Clematis uncinata
Authors: Li Shuo‐Guo , Huang Xiao‐Jun , Li Man‐Mei , Wang Mei , Feng Rui‐Bing , Zhang Wei , Li Yao‐Lan , Wang Ying , Ye Wen‐Cai 
Published: May 2014

Abstractisolation, structure elucidation and cytotoxic activity of eight new bisdesmosidic triterpenoid saponins, clematiunicinosides A‐H, along with eleven known ones
ChemInform Abstract: Laccase and Laccase‐Mediated Systems in the Synthesis of Organic Compounds
Authors: Mogharabi Mehdi , Faramarzi Mohammad Ali 
Published: May 2014

AbstractReview: [recent studies on structural properties, occurence, reaction mechanism, redox mediators of laccases and their application in dimerization, polymerization, oxidation and amination reactions; 201 refs.
A Highly Selective and Sensitive Fluorescent Chemosensor for Detection of Al3+ in Totally Aqueous Media
Authors: Li Xiaobo , Chen Jiayi , Wang Enju 
Published: May 2014

AbstractA fluorescent chemosensor (1) based on 2‐hydroxy‐1‐naphthaldehyde Schiff‐base was developed for the detection of Al3+ in 100% aqueous solution. Upon addition of Al3+, a significant fluorescence enhancement was observed, which was not affected by other metal ions including Na+, K+, Ca2+, Mg2+, Mn2+, Co2+, Ni2+, Cu2+, Cr3+, Ag+, Pb2+, Zn2+, Cd2+, Hg2+, Fe2+ and Fe3+ under weak acid conditions. Moreover, the specific response to Al3+ was visible under natural light. The binding mode between 1 and Al3+ was clarified by ESI‐MS and 1H NMR.
4‐Benzamido‐TEMPO Catalyzed Oxidation of a Broad Range of Alcohols to the Carbonyl Compounds with NaBrO3 under Mild Conditions
Authors: Shen Jiaxuan , Sun Jiangkai , Qin Shuangshuang , Chu Changhu , Liu Renhua 
Published: May 2014

Abstract4‐Benzamido‐TEMPO catalyzed oxidation system for conversion of a wide range of alcohols to the aldehydes or ketones with NaBrO3 under room temperature conditions has been developed. The credible, operationally convenient and economical, and condition mild oxidation protocol is particularly of interest in laboratory and in fine chemicals manufacture.
Efficient Extractive Desulfurization of Fuel Oils Using N‐Pyrrolidone/Alkylphosphate‐Based Ionic Liquids
Authors: Liu Chunhai , He Qihui , Zhang Zheng , Su Yangyang , Xu Renfu , Hu Baixing 
Published: May 2014

AbstractFour BrØsted acid ionic liquids (ILS) [MMP][DMP], [MEP][DEP], [HMP][DMP] and [HEP][DEP] were synthesized and used as extractants for desulfurization of aromatic sulfur compounds in model oil. The mutual solubility of four ILs were investigated. The extraction equilibrium of four ILs could be reached in as soon as 5 min and the extraction capability followed the order [MMP][DMP]>[MEP][DEP]>[HEP][DEP]>[HMP][DMP]. The S extraction showed the highest efficiency under the conditions of 30°C, 30 min and 1:1 (V/V) IL:oil. Under the optimal condition, 70.9% of thiophene (TS), 76.9% of benzothiophene (BT) and 87.5% of dibenzothiophene (DBT) in n‐octane could be efficiently removed by [MMP][DMP]. The multiple extraction and regeneration performance of [MMP][DMP] for TS was also investigated and the results were satisfying. These results suggest that [MMP][DMP] has the best extraction capability and can serve as a promising solvent for extractive desulfurization of fuel oils.
An improved method of genome size estimation by flow cytometry in five mucilaginous species of Hyacinthaceae
Authors: Nath Sayantani , Mallick Sanjaya Kumar , Jha Sumita 
Published: May 2014

AbstractThe family Hyacinthaceae constitutes about 900 species of bulbous geophytes usually characterized by high mucilage content. Taxonomic delimitation of Hyacinthaceae has been controversial since the time of Linnaeus due to the absence of reliable discriminating characters. Pattern of genome size variation can thus be considered as an added character to aid intergeneric and intrageneric relationship of the group. However, reports on genome size estimation by flow cytometric analysis of these plants are rare due to the presence of mucilage, which causes problem with nuclei sample preparation. To overcome this problem five reported nuclei isolation buffers were tested in Drimia indica of which Galbraith's buffer gave comparatively better results and was further modified by increasing pH, detergent concentration, and replacing sodium citrate by citric acid. The modified buffer enabled better sample preparation with increased yield, lesser debris, and improved DNA peak CV. The standardized buffer was used to estimate the 2C values of Drimia indica, Drimia nagarjunae, Drimia wightii, Drimia coromandeliana, and Ledebouria revoluta for the first time by flow cytometric analysis. This study also opens up the scope for further improvement in sample preparation for flow cytometric analysis of mucilaginous plants, which is otherwise problematic due to nuclei clumping and increased viscosity of sample. © 2014 International Society for Advancement of Cytometry
Privacy‐friendly weighted‐reputation aggregation protocols against malicious adversaries in cloud services
Authors: Zhang Mingwu , Xia Yong , Yuan Ou , Morozov Kirill 
Published: May 2014

SummaryReputation systems are used for evaluating trustworthiness of the users based on their feedback (i.e., votes) about each other. Such systems are particularly important for cloud service providers, as they allow them to collect and aggregate feedback on the past behavior of users. Weighted‐reputation aggregation is a protocol, where the vote server has a weight vector
for all voters, each voter has a vote score yi, and they cooperate to compute
. We call it ‘privacy‐friendly’, if the respective inputs are kept private. In other words, a privacy‐friendly weighted aggregation protocol is a secure evaluation for functionality
. In this work, we propose two privacy‐friendly weighted‐reputation aggregation protocols: one in semi‐honest model and another one in malicious model. The latter protocol uses the cryptographic primitives of homomorphic encryption, verifiable encryption, and the proof of knowledge of a discrete logarithm. Our protocols need only two rounds of communications, which is very efficient in practice. Our protocols are secure against the collusion of at most n − 2malicious adversaries. Copyright © 2014 John Wiley & Sons, Ltd.
The impact of discontinuing methylphenidate on weight and eating behavior
Authors: Benard Victoire , Cottencin Olivier , Guardia Dewi , Vaiva Guillaume , Rolland Benjamin 
Published: May 2014

ABSTRACTChronic administration of the amphetamine‐derivative methylphenidate (MPH) may induce appetite reduction and weight loss. By contrast, the effects that stopping chronic MPH may exert on eating behavior and body weight are poorly known.We report the case of a male patient with childhood attention deficit/hyperactivity disorder (ADHD), who discontinued MPH treatment at the age of 11 years and was lost to follow‐up until the age of 16. The patient's body mass index increased by five points within 1 year of MPH cessation while the symptoms of ADHD were re‐emerging. The patient secondarily developed DSM‐5 criteria for eating disorders.Discontinuing chronic MPH can significantly affect weight and eating behavior. Such risks should warrant further studies, as they could be particularly increased in patients with ADHD, who share common vulnerability factors with both obesity and eating disorders. © 2014 Wiley Periodicals, Inc. (Int J Eat Disord 2015; 48:345–348)
Is isolation by adaptation driving genetic divergence among proximate Dolly Varden char populations?
Authors: Bond Morgan H. , Crane Penelope A. , Larson Wesley A. , Quinn Tom P. 
Published: May 2014

AbstractNumerous studies of population genetics in salmonids and other anadromous fishes have revealed that population structure is generally organized into geographic hierarchies (isolation by distance), but significant structure can exist in proximate populations due to varying selective pressures (isolation by adaptation). In Chignik Lakes, Alaska, anadromous Dolly Varden char (Salvelinus malma) spawn in nearly all accessible streams throughout the watershed, including those draining directly to an estuary, Chignik Lagoon, into larger rivers, and into lakes. Collections of Dolly Varden fry from 13 streams throughout the system revealed low levels of population structure among streams emptying into freshwater. However, much stronger genetic differentiation was detected between streams emptying into freshwater and streams flowing directly into estuarine environments. This fine‐scale reproductive isolation without any physical barriers to migration is likely driven by differences in selection pressures across freshwater and estuarine environments. Estuary tributaries had fewer larger, older juveniles, suggesting an alternative life history of smolting and migration to the marine environment at a much smaller size than occurs in the other populations. Therefore, genetic data were consistent with a scenario where isolation by adaptation occurs between populations of Dolly Varden in the study system, and ecological data suggest that this isolation may partially be a result of a novel Dolly Varden life history of seawater tolerance at a smaller size than previously recognized.
Serendipitous Metal‐Catalyzed H–H/Si–H Exchange
Authors: Nikonov Georgii I. , Vyboishchikov Sergei F. , Shirobokov Oleg G. , Simionescu Razvan 
Published: May 2014

AbstractVarious metal complexes catalyze exchange between H2 and hydrosilanes. Catalyst screening suggests that the electron deficiency of the metal center is necessary for exchange, but silane and/or hydrogen addition or σ‐bond metathesis with the M–Si and M–H bonds are not required. Kinetic measurements for the system [(ArN=)Mo(PMe3)3(H)(SiH2Ph)/H2/H3SiPh] (Ar = 2,6‐iPr2C6H3) suggest that the reaction proceeds through activation of the silane.
Visible‐Light‐Promoted Synthesis of Benzimidazoles
Authors: Park Sehyun , Jung Jaehun , Cho Eun Jin 
Published: May 2014

AbstractA simple and environmentally‐friendly synthetic method for benzimidazoles, which are important structural motifs in many applications owing to their various biological functions, has been developed. The reaction of o‐phenylenediamine and a variety of aliphatic/aromatic aldehydes in methanol proceeds at room temperature with only natural sources, molecular oxygen and visible light.
Nonlinear seismic analysis of reinforced concrete frames using the force analogy method
Authors: Li Gang , Zhang Yu , Li Hong‐Nan 
Published: May 2014

SUMMARYA method of nonlinear seismic analysis for RC framed structures considering full‐range factors, including stiffness and strength degradation, geometric nonlinearity, and structural member failure, is established based on the fundamental concept of the force analogy method. The strong material nonlinearity, large geometric deformation, and internal forces redistribution due to the member failure can be depicted by the proposed local plastic mechanisms, the rotation hinges at the member ends and the slide hinges assigned to the columns, of which the measurement relationships are moment versus plastic rotation and shear force versus shear plastic deformation, respectively. They are capable of evaluating the exact response of RC structures. Because only unchanging initial stiffness matrices are used through the whole computation process, the state‐space formulation was used for solving the equations of motion. The advantages of the force analogy method, such as high efficiency and stability, are still retained. The exactness of the proposed local plastic mechanisms is verified against a group of tests data, and the application of the proposed procedure is performed to an RC framed structure to simulate the full‐range nonlinear response by increasing the excitation step by step until failure of partial structural members appear. Copyright © 2014 John Wiley & Sons, Ltd.
Potassium sarcosinate promoted aqueous ammonia solution for post‐combustion capture of CO2
Authors: Yang Nan , Xu Dong Yao , Yu Hai , Conway William , Maeder Marcel , Feron Paul 
Published: May 2014

AbstractAqueous ammonia (NH3) is regarded as one of the most cost‐effective solvents for carbon dioxide (CO2) separation processes but suffers from low CO2 absorption rates and high NH3 vapor losses which hinder industrial application of this solvent in CO2 capture from the flue gas of the coal‐fired power sectors. In an attempt to address these issues, the effect of adding of potassium sarcosinate (K‐SAR) to NH3 solutions as a rate promoter on CO2 mass transfer and NH3 vapor loss in the aqueous NH3‐based post‐combustion capture process was investigated in this work. Overall mass transfer coefficients (KG) describing CO2 absorption and NH3 vapor loss in 3.0M NH3 and blended 3.0M NH3 solutions containing a wide range of K‐SAR concentrations from 0.0 to 3.0M were determined using a wetted‐wall column contactor at 15–25 °C and CO2 loadings from 0.0 to 0.5(molCO2/mol total amine). Additionally, prediction of equilibrium species distribution using fundamental chemical modelling software (ReactLab) in CO2‐loaded NH3 containing blended solutions were used to explain our experimental results. Addition of K‐SAR resulted in significant improvement of KG of CO2 absorption in NH3 solutions, but also increased NH3 vapor losses. The effect of temperature on KG of CO2 absorption in K‐SAR solution was greater than in the NH3/K‐SAR blended solution. The improvement in mass transfer upon addition of K‐SAR is due to the faster reaction of CO2 with K‐SAR than with NH3. The greater loss of NH3 upon addition of K‐SAR can be ascribed to the availability of more free NH3 and the decrease of solubility of CO2 and NH3 in the NH3/K‐SAR blended solution. The investigation of KG of CO2 and NH3 vapor losses in NH3 and other amines (PZ, 1‐MPZ, DEA and MEA) blended solutions also proved the competition for CO2 is one of the reasons for the increasing of NH3 vapor losses.