bluuebunny/crossref_metadata_2025_split huggingface dataset:
ChemInform Abstract: Synthesis of β‐Enamino Acid and Heteroaryl Acetic Acid Derivatives by Pd‐Catalyzed Carbonylation of α‐Chloroimines and 2‐Chloromethyl Aza‐Heterocycles.
Authors: Perrone Serena , Capua Martina , Cannazza Giuseppe , Salomone Antonio , Troisi Luigino 
Published: June 2016

AbstractA new mild and high yielding methodology for concomitant C—C and C—O or C—N bond formation across α‐chloroimines or chloromethyl heteroaromatic rings containing a C—N double bond is developed.
ChemInform Abstract: Regioselective Iodoamination of Terminal Ynamides for the Synthesis of α‐Amino‐β,β‐diiodo‐enamides.
Authors: Huang Hai , Tang Luning , Han Xiaobo , He Guangke , Xi Yang , Zhu Hongjun 
Published: June 2016

AbstractIntermolecular iodoamination of alkynes to diiodoenamines is achieved for the first time.
ChemInform Abstract: Nickel‐Catalyzed Negishi Cross‐Coupling of Bromodifluoroacetamides.
Authors: Tarui Atsushi , Shinohara Saori , Sato Kazuyuki , Omote Masaaki , Ando Akira 
Published: June 2016

AbstractAn efficient transformation of bromodifluoroacetamides containing cyclic and a primary, secondary or tertiary amide group, including cyclic and amino acid derived moieties, with variously functionalized aryl zinc reagents is described.
ChemInform Abstract: An Efficient and Straightforward Route to Terminal Vinyl Sulfones via Palladium‐Catalyzed Suzuki Reactions of α‐Bromo Ethenylsulfones.
Authors: Fang Yewen , Yuan Meijuan , Zhang Juncong , Zhang Li , Jin Xiaoping , Li Ruifeng , Li Jinjian 
Published: June 2016

AbstractAn efficient and straightforward method for the preparation of α‐substituted alkenylsulfones via Suzuki reactions of α‐bromo ethenylsulfones with organoboron reagents is reported.
ChemInform Abstract: Cu—Ag/Hydrotalcite Catalysts for Dehydrogenative Cross‐Coupling of Primary and Secondary Benzylic Alcohols.
Authors: Xu Jin , Yue Hongmei , Liu Sheng , Wang Hanfei , Du Yuqun , Xu Chunli , Dong Wensheng , Liu Chunling 
Published: June 2016

AbstractA C—C cross‐coupling of benzylic alcohols with an air‐stable, heterogeneous catalyst yields aryl alkyl ketones efficiently.
ChemInform Abstract: Direct Carboxylation of Aryl Tosylates by CO2 Catalyzed by in situ‐Generated Ni0.
Authors: Rebih Fatima , Andreini Manuel , Moncomble Aurelien , Harrison‐Marchand Anne , Maddaluno Jacques , Durandetti Muriel 
Published: June 2016

AbstractThe mild, convenient and user‐friendly process tolerates multiple functional groups.
ChemInform Abstract: 9‐Fluorenylmethyl (Fm) Disulfides: Biomimetic Precursors for Persulfides.
Authors: Park Chung‐Min , Johnson Brett A. , Duan Jicheng , Park Jeong‐Jin , Day Jacob J. , Gang David , Qian Wei‐Jun , Xian Ming 
Published: June 2016

AbstractThe title disulfides can convert the small molecules and protein thiols to disulfides which can further generate highly reactive persulfides in their anionic forms.
ChemInform Abstract: Triazine‐Triazole Conjugates as Potent Ligands for Cu‐Catalyzed Sonogashira Reaction.
Authors: Wang Zhenhua , Wang Xiu , Sun Huaming , Zhu Zhuangli , Zhang Guofang , Zhang Weiqiang , Gao Ziwei 
Published: June 2016

AbstractSubstituted triazine‐triazole derivatives are effective ligands for the copper‐catalyzed Sonogashira reaction.
ChemInform Abstract: Asymmetric α‐Hydroxylation of β‐Indanone Esters and β‐Indanone Amides Catalyzed by C‐2′ Substituted Cinchona Alkaloid Derivatives.
Authors: Wang Yakun , Yin Hang , Qing Hai , Zhao Jingnan , Wu Yufeng , Meng Qingwei 
Published: June 2016

AbstractBoth enantiomers are accessible using the same cupreidine‐derived organocatalyst by simply changing the oxidant.
ChemInform Abstract: Enantioselective Synthesis of Aminoindan Carboxylic Acid Derivatives by the Catalytic Intramolecular [2 + 2 + 2] Cycloaddition of Amino‐Acid‐Tethered Triynes.
Authors: Tahara Yu‐ki , Obinata Shuhei , Kanyiva Kyalo Stephen , Shibata Takanori , Mandi Attila , Taniguchi Tohru , Monde Kenji 
Published: June 2016

AbstractA method for preparation of valuable, optically active aminoindane carboxylic acid (Aic) derivatives is developed based on an asymmetric macrocyclization followed by hydrolysis towards the free Aic.
ChemInform Abstract: Isatin‐Based Three‐Component Synthesis of New Spirooxindoles Using Magnetic Nano‐Sized Copper Ferrite.
Authors: Baghernejad Mojtaba , Khodabakhshi Saeed , Tajik Sanaz 
Published: June 2016

AbstractSpirooxindoles are synthesized in good to excellent yields by one‐pot reaction of isatine derivatives with Michael donors and malononitrile.
ChemInform Abstract: Photoredox‐Catalyzed Intramolecular Difluoromethylation of N‐Benzylacrylamides Coupled with a Dearomatizing Spirocyclization: Access to CF2H‐Containing 2‐Azaspiro[4.5]deca‐6,9‐diene‐3,8‐diones.
Authors: Zhang Zuxiao , Tang Xiao‐Jun , Dolbier William R. Jr. 
Published: June 2016

AbstractThe simple, broadly applicable reaction procedure delivers a diverse range of the difluoromethylated title products containing adjacent quaternary stereocenters in high yields.
ChemInform Abstract: Organocatalytic Asymmetric Biginelli‐Like Reaction Involving Isatin.
Authors: Stucchi Mattia , Lesma Giordano , Meneghetti Fiorella , Rainoldi Giulia , Sacchetti Alessandro , Silvani Alessandra 
Published: June 2016

AbstractA new asymmetric, Broensted acid catalyzed Biginelli‐like transformation is developed and the stereochemical outcome is rationalized using computational studies on the reaction transition state.
ChemInform Abstract: KI/TBHP‐Mediated Oxidative Cross‐Coupling of Enamines and Carboxylic Acids under Metal‐Free Conditions: A Facile Access to Functionalized 2H‐Azirines.
Authors: Duan Xiyan , et al.  
Published: June 2016

AbstractA novel method for the synthesis of the acyloxylated 2H‐azirines through oxidative cross coupling reaction between the enamines and acids in MeCN is described.
ChemInform Abstract: Synthesis of Aminomethyl Derivatives of 5‐Substituted‐3‐(prop‐2ynyl)dihydrofuran‐2(3H)‐ones.
Authors: Ghochikyan Tariel V. , Samvelyan Melanya A. , Harutyunyan Vilik S. , Harutyunyan Edgar V. , Petrosyan Andranik , Langer Peter 
Published: June 2016

AbstractThe title furanones are synthesized in good to very good yields by Mannich aminomethylation of terminal alkynes.
ChemInform Abstract: Copper‐Catalyzed Carbochlorination or Carbobromination via Radical Cyclization of Aryl Amines.
Authors: Ouyang Jianing , Su Xiaolong , Chen Yu , Yuan Yaofeng , Li Yi 
Published: June 2016

AbstractThe new and efficient copper‐catalyzed intramolecular carbochlorination employs aryl amines as starting materials and aqueous HCl, providing a facile access to relevant 3‐chloromethyl‐2,3‐dihydrobenzofuran derivatives.
ChemInform Abstract: Cobalt(III)‐Catalyzed Synthesis of Pyrroles from Enamides and Alkynes.
Authors: Yu Wenlong , Zhang Wei , Liu Yue , Zhou Yougui , Liu Zhanxiang , Zhang Yuhong 
Published: June 2016

AbstractThis efficient regioselective cyclization of enamides with alkynes yields various pyrroles.
ChemInform Abstract: One‐Pot Conversion of N‐Allyl‐α‐Cyano Esters to α‐Allyl‐α‐Cyano Lactams Through a Hydrolysis/Ketene Formation/Cyclization/Claisen Rearrangement Sequence.
Authors: Shen Mei‐Hua , Han Mei , Xu Hua‐Dong 
Published: June 2016

AbstractThe title conversion is highly chemoselective when an asymmetric bis‐N‐allyl group is presented.
ChemInform Abstract: Palladium‐Catalyzed C—H Arylation of Indoles at the C7 Position.
Authors: Yang Youqing , Qiu Xiaodong , Zhao Yue , Mu Yucheng , Shi Zhuangzhi 
Published: June 2016

AbstractKey to the regioselectivity is the choice of the phosphinoyl directing group and a pyridine‐type ligand in the presence of Pd(OAc)2 as catalyst.
ChemInform Abstract: Lewis Acid Catalyzed Regioselective Hydroheteroarylation of Pentafulvenes.
Authors: Chand S. Sarath , Gopalan Greeshma , Santhini P. V. , Preethanuj P. , John Jubi , Harakat Dominique , Jaroschik Florian , Radhakrishnan K. V. 
Published: June 2016

AbstractThe catalytic regioselective nucleophilic addition of nitrogen heterocycles to Lewis acid activated pentafulvenes is investigated.
ChemInform Abstract: Site‐Selective N‐Arylation of Carbazoles with Halogenated Fluorobenzenes.
Authors: Wang Lei , Ji Enhui , Liu Ning , Dai Bin 
Published: June 2016

AbstractDepending on the reaction conditions, fluorohalobenzenes either undergo C—halo activation (inert conditions, base, Cu catalyst) giving the N‐fluorophenylated carbazoles or undergo C—F bond activation (aerobic conditions, base only) giving the halo‐arylated products.
ChemInform Abstract: Acid‐Relayed Organocatalytic exo‐Diels—Alder Cycloaddition of Cyclic Enones with 2‐Vinyl‐1H‐indoles.
Authors: Ren Ji‐Wei , Zhou Zhao‐Fang , Xiao Jun‐An , Chen Xiao‐Qing , Yang Hua 
Published: June 2016

AbstractThe enantioselective DAR of cyclic enones with 2‐vinylindoles is achieved with the aid of hydrogen‐bond relay from (S)‐camphorsulfonic acid.
ChemInform Abstract: Copper Catalyzed Assembly of N‐Aryloxazolidinones: Synthesis of Linezolid, Tedizolid, and Rivaroxaban.
Authors: Mahy William , Leitch Jamie A. , Frost Christopher G. 
Published: June 2016

AbstractThree oxazolidinone‐based pharmaceuticals, antibacterials linezolid (I) and tedizolid (II) and anticoagulant rivaroxaban (III) are synthesized using a recently reported copper‐catalyzed one‐pot cyclization and arylation as the key step to construct the N‐aryloxazolidinone core.
ChemInform Abstract: Isoxazolo[4,3‐e]indazole as a New Heterocyclic System: Design, Synthesis, Spectroscopic Characterization, and Antibacterial Activity.
Authors: Ghaemi Masoumeh , Pordel Mehdi 
Published: June 2016

Abstract5 Title title compounds of type (III) and (V) are prepared with the corresponding compounds (IV) being formed as side products.
ChemInform Abstract: Catalytic Formal Cycloadditions Between Anhydrides and Ketones: Excellent Enantio and Diastereocontrol, Controllable Decarboxylation and the Formation of Adjacent Quaternary Stereocentres.
Authors: Cornaggia Claudio , Gundala Sivaji , Manoni Francesco , Gopalasetty Nagaraju , Connon Stephen J. 
Published: June 2016

AbstractThe cycloaddition reactions are promoted by novel, readily prepared urea‐substituted cinchona alkaloid‐derived catalysts.
ChemInform Abstract: Synthesis of DNA‐Intercalating 6H‐Benzo[c]chromen‐6‐one Derivatives Through a Strategic Combination of Garratt—Braverman and Minisci Acyloxylation Reactions.
Authors: Bhattacharya Prabuddha , Mandal Santi M. , Basak Amit 
Published: June 2016

AbstractA strategy for the synthesis of 6H‐benzo[c]chromen‐6‐ones through judicious use of Garratt—Braverman (GB) cyclization and Minisci acyloxylation reactions in moderate to good yield is reported.
ChemInform Abstract: FeCl3‐Mediated One‐Pot Domino Reactions for the Synthesis of 9‐Aryl/9‐Arylethynyl‐2,3,4,9‐tetrahydro‐1H‐xanthen‐1‐ones from Propargylic Amines/Diaryl Amines and 1,3‐Cyclohexanediones.
Authors: He Xinwei , Tao Jiajia , Hu Xiaoqian , Wang Hui , Shang Yongjia 
Published: June 2016

AbstractThis provides an efficient, environmentally friendly one‐pot protocol for preparation of the title compounds which are of interest due to their biological as well as their (photo)physical properties.
ChemInform Abstract: Iron‐Catalyzed Cyclization of Ketoxime Carboxylates and Tertiary Anilines for the Synthesis of Pyridines.
Authors: Zhao Mi‐Na , Ren Zhi‐Hui , Yu Le , Wang Yao‐Yu , Guan Zheng‐Hui 
Published: June 2016

AbstractA series of 2,4,6‐trisubstituted and 2,4‐disubstituted pyridines is readily prepared by Fe‐catalyzed reaction of ketoximes (I) and (VI) with tertiary amines.
ChemInform Abstract: ZnO Nanoparticles as Reusable Heterogeneous Catalyst for Efficient one Pot Three Component Synthesis of Imidazo‐Fused Polyheterocycles.
Authors: Swami Suman , Devi Nisha , Agarwala Arunava , Singh Virender , Shrivastava Rahul 
Published: June 2016

AbstractA new efficient isocyanide based method to synthesize biologically relevant pyrazole coupled imidazo[1,2‐a]pyridine derivatives is presented.
ChemInform Abstract: Visible‐Light‐Induced Regioselective Synthesis of Polyheteroaromatic Compounds.
Authors: Chatterjee Tanmay , Choi Myung Gil , Kim Jun , Chang Suk‐Kyu , Cho Eun Jin 
Published: June 2016

AbstractA highly regioselective photocycloaddition of 2‐heteroarylanilines with heteroaryl alkynes gives polycyclic heteroarenes through diazotization.
ChemInform Abstract: Iodine‐Mediated Intramolecular Dehydrogenative Coupling: Synthesis of N‐Alkylindolo[3,2‐c]‐ and ‐[2,3‐c]quinoline Iodides.
Authors: Volvoikar Prajesh S. , Tilve Santosh G. 
Published: June 2016

AbstractThe tetracycles are synthesized by the title coupling reaction through an annulation/aromatization sequence.
ChemInform Abstract: Synthesis of Gem‐Difluorinated Fused Quinolines via Visible Light‐Mediated Cascade Radical Cyclization.
Authors: Xiao Tiebo , Li Linyong , Xie Yang , Mao Zong‐Wan , Zhou Lei 
Published: June 2016

AbstractThe title compounds are prepared by reaction of functionalized difluoromethyl chlorides with alkenes.
ChemInform Abstract: CBr4 Mediated Oxidative C—N Bond Formation: Applied in the Synthesis of Imidazo[1,2‐α]pyridines and Imidazo[1,2‐α]pyrimidines.
Authors: Huo Congde , Tang Jing , Xie Haisheng , Wang Yajun , Dong Jie 
Published: June 2016

AbstractThe metal‐free, scalable title synthesis is based on the reaction between various 2‐aminopyridines or pyrimidines with β‐keto esters or 1,3‐diones, including cyclic derivatives.
ChemInform Abstract: Intermolecular Cyclization of N‐Methylanilines and Maleimides to Tetrahydroquinolines via K2S2O8 Promoted C(sp3)—H Activation.
Authors: Yadav Arvind K. , Yadav Lal Dhar S. 
Published: June 2016

AbstractAn efficient and straightforward synthesis of tricyclic compounds incorporating biologically relevant tetrahydroquinoline core using K2S2O8 as a cheap radical initiator is reported.
ChemInform Abstract: Synthesis and Some Properties of Alkynyl Derivatives of 1,3‐Dialkylperimidones. An Example of the 1,2‐Palladium Migration in the Sonogashira Reaction.
Authors: Filatova Ekaterina A. , Gulevskaya Anna V. , Pozharskii Alexander F. , Ozeryanskii Valery A. 
Published: June 2016

AbstractSubstrates bearing 1,2,3 or 4 bromine substituents are investigated in Sonogashira reactions with alkynes (II) and (VI).
ChemInform Abstract: Synthesis and Characterization of N‐Heterocyclic Carbene‐Palladium(II) Chlorides‐1‐methylindazole and ‐1‐methylpyrazole Complexes and Their Catalytic Activity Toward C—N Coupling of Aryl Chlorides.
Authors: Zhao Xiao‐Yun , Zhou Quan , Lu Jian‐Mei 
Published: June 2016

AbstractThe title complexes are efficient catalysts in the C—N coupling of primary and secondary amines with aryl chlorides at low catalyst loadings.
ChemInform Abstract: Phosphine Oxide—Sc(OTf)3 Catalyzed Highly Regio‐ and Enantioselective Bromoaminocyclization of (E)‐Cinnamyl Tosylcarbamates. An Approach to a Class of Synthetically Versatile Functionalized Molecules.
Authors: Pan Hongjie , Huang Hu , Liu Weigang , Tian Hua , Shi Yian 
Published: June 2016

AbstractBy using a chiral phosphine oxide as ligand, aryl 5‐bromo‐1,3‐oxazinan‐2‐ones are synthesized from the title approach in good yields and high enantioselectivity.
ChemInform Abstract: Enantioselective Copper‐Catalyzed Formal [4 + 2] Cycloaddition of o‐Aminophenol Derivatives with Propargylic Esters for Synthesis of Optically Active 3,4‐Dihydro‐2H‐1,4‐benzoxazines.
Authors: Liu Zhen‐Ting , Wang Ya‐Hui , Zhu Fu‐Lin , Hu Xiang‐Ping 
Published: June 2016

Abstract25 examples
ChemInform Abstract: Lewis Acid Catalyzed [4 + 3] Cycloaddition of Propargylic Alcohols with Azides.
Authors: Han Ya‐Ping , Song Xian‐Rong , Qiu Yi‐Feng , Zhang Heng‐Rui , Li Lian‐Hua , Jin Dong‐Po , Sun Xiao‐Qing , Liu Xue‐Yuan , Liang Yong‐Min 
Published: June 2016

AbstractThe title reaction leads to polycyclic products containing an imine‐based indole azepine scaffold.
ChemInform Abstract: Organoselenium and DMAP Co‐Catalysis: Regioselective Synthesis of Medium‐Sized Halolactones and Bromooxepanes from Unactivated Alkenes.
Authors: Verma Ajay , Jana Sadhan , Durga Prasad Ch. , Yadav Abhimanyu , Kumar Sangit 
Published: June 2016

AbstractA catalytic system for the regioselective cyclization of alkenoic acids towards medium‐sized bromo‐ and iodo lactones is presented.
ChemInform Abstract: Iridium/N‐Heterocyclic Carbene‐Catalyzed C—H Borylation of Arenes by Diisopropylaminoborane.
Authors: Tobisu Mamoru , Igarashi Takuya , Chatani Naoto 
Published: June 2016

AbstractDiisopropylaminoborane is introduced as a boron source for C—H borylation of arenes.
ChemInform Abstract: Iridium‐Catalyzed, Hydrosilyl‐Directed Borylation of Unactivated Alkyl C—H Bonds.
Authors: Larsen Matthew A. , Cho Seung Hwan , Hartwig John 
Published: June 2016

AbstractA hydrosilyl‐directed iridium‐catalyzed borylation of primary and secondary alkyl C—H bonds to form alkylboronate esters is developed.
ChemInform Abstract: A New Dammarane‐Type Saponin from Gynostemma pentaphyllum Induces Apoptosis in A549 Human Lung Carcinoma Cells.
Authors: Xing Shao‐Fang , Jang Moonhee , Wang Yu‐Rong , Piao Xiang‐Lan 
Published: June 2016

AbstractThe new dammarane‐type saponin gypenoside Jh1 (I) is isolated from Gynostemma pentaphyllum.
ChemInform Abstract: Fusiformines A and B: New Indole Alkaloids from Melodinus fusiformis.
Authors: Li Yong‐chao , Yang Jing , Zhou Xiu‐ren , Liang Xin‐hong , Fu Qing‐yun 
Published: June 2016

AbstractFusiformines A (I) and B (II) are isolated from the twigs and leaves of Melodinus fusiformis.
ChemInform Abstract: Four New Carbazole Alkaloids from Murraya koenigii that Display Antiinflammatory and Antimicrobial Activities.
Authors: Nalli Yedukondalu , Khajuria Vidushi , Gupta Shilpa , Arora Palak , Riyaz‐Ul‐Hassan Syed , Ahmed Zabeer , Ali Asif 
Published: June 2016

AbstractFour new carbazole alkaloids murrayakonines A—D are isolated together with 18 known carbazole alkaloids.
ChemInform Abstract: Metabolites from the Euryhaline Ciliate Pseudokeronopsis erythrina.
Authors: Anesi Andrea , Buonanno Federico , di Giuseppe Graziano , Ortenzi Claudio , Guella Graziano 
Published: June 2016

AbstractThree new secondary metabolites, named erythrolactones A2 (Ia), B2 (Ib) and C2 (Ic) and their respective sulfate esters are isolated from cell cultures of Pseudokeronopsis erythrina, clone TL‐1.
ChemInform Abstract: Enhanced Luminescence and Abnormal Thermal Quenching Behavior Investigation of BaHfSi3O9:Eu2+ Blue Phosphor Co‐Doped with La3+—Sc3+ Ion Pairs.
Authors: Xin Shuangyu , Zhu Ge 
Published: June 2016

AbstractBa0.98‐xLaxHf1‐xScxSi3 O9:0.02Eu2+ (x = 0—0.02) is prepared by solid state reaction of stoichiometric amounts of BaCO3, La2O3, Sc2O3, HfO2, SiO2, and Eu2O3 (Al2O3 crucible, 1.
ChemInform Abstract: Phase Competitions Behind the Giant Magnetic Entropy Variation: Gd5Si2Ge2 and Tb5Si2Ge2 Case Studies
Authors: Pires Ana Lucia , Belo Joao Horta , Lopes Armandina Maria Lima , Gomes Isabel T. , Morellon Luis , Magen Cesar , Algarabel Pedro Antonio , Ibarra Manuel Ricardo , Pereira Andre Miguel , Araujo Joao Pedro 
Published: June 2016

AbstractReview: 27 refs.
ChemInform Abstract: Pentamethylcyclopentadienyl Iridium(III) Metallacycles Applied to Homogeneous Catalysis for Fine Chemical Synthesis
Authors: Michon Christophe , MacIntyre Kirsty , Corre Yann , Agbossou‐Niedercorn Francine 
Published: June 2016

AbstractReview: [29 refs.
ChemInform Abstract: Removal of TcO4‐ions from Solution: Materials and Future Outlook
Authors: Banerjee Debasis , Kim Dongsang , Schweiger Michael J. , Kruger Albert A. , Thallapally Praveen K. 
Published: June 2016

AbstractReview: discussion of using ionic metal organic frameworks (i‐MOFs) and related materials as next‐generation exchange materials; 51 refs.
Synthesis and Enantiomeric Recognition Studies of Optically Active Pyridino‐Crown Ethers Containing an Anthracene Fluorophore Unit
Authors: Szemenyei Balázs , Móczár Ildikó , Pál Dávid , Kocsis Ivett , Baranyai Péter , Huszthy Péter 
Published: June 2016

AbstractNovel enantiopure pyridino‐18‐crown‐6 ether‐based sensor molecules containing an anthracene fluorophore unit were synthesized. Their enantiomeric recognition abilities toward the enantiomers of 1‐phenylethylamine hydrogen perchlorate (PhEt), 1‐(1‐naphthyl)ethylamine hydrogen perchlorate (NapEt), phenylglycine methyl ester hydrogen perchlorate (PhgOMe), and phenylalanine methyl ester hydrogen perchlorate (PheOMe) were examined in acetonitrile using fluorescence spectroscopy. The sensor molecules showed appreciable enantiomeric recognition toward the enantiomers of NapEt, PhEt, and PhgOMe. The highest enantioselectivity was found in the case of crown ether containing isobutyl groups in the macroring and the enantiomers of NapEt. Chirality 28:562–568, 2016. © 2016 Wiley Periodicals, Inc.
Experimental investigation of the effects of SnO2 nanoparticles and KCl salt on a water base drilling fluid properties
Authors: Parizad Amirhossein , Shahbazi Khalil 
Published: June 2016

AbstractReduction of proven gas and oil reserves and increasing demand for energy forces the petroleum industry to drill deeper and more complicated wells. Drilling in these harsh environments requires drilling fluids with specific characteristics. So, improvement of the drilling fluids that can act as proper fluids at high pressure and high temperature conditions is vital in the drilling industry. The purpose of this study is examining the effects of SnO2 nanoparticles on the properties of drilling fluids and determining of the extent of improvement of water‐based drilling fluids performance. These nanoparticles were added to polymeric water‐based drilling fluids in various concentrations of 1, 2.5, 5, and 7.5 g/L in the presence of KCl at concentrations of 5, 15, 30, 60, and 100 g/L. The experiments were done at temperatures of 30, 50, 70, and 90 °C. Electrical conductivity, thermal conductivity, and thixotropy of the resulting drilling fluids were investigated. Moreover, filtration of the drilling fluids at room temperature, 65, and 95 °C and pressures of 0.6895 MPa (100 psig) and 2.758 MPa (400 psig) and various nanoparticle concentrations were studied. It was found that electrical conductivity and thermal conductivity were increased by 30 % and 15 %, respectively. Finally, in order to have more accurate hydraulic calculations, five rheological models were studied and compared together. It was observed that the Herschel‐Bulkley‐Papanastasiou model showed the highest accuracy with an absolute relative error of 1.1 %.
Kinetic study of the dissolution of metallic nickel in sulphuric acid solutions in the presence of different oxidants
Authors: Bilczuk Dario , Olvera Oscar G. , Asselin Edouard 
Published: June 2016

AbstractThe dissolution of metallic nickel particles in sulphuric acid solutions has been studied in this work. The effect of temperature, sulphuric acid concentration, and oxidant type has been assessed. In the presence of hydrogen peroxide or dissolved oxygen the dissolution of nickel was fast.A shrinking particle model was used to fit the experimental data and estimate kinetic parameters. The apparent reaction rate constants calculated at 55 °C when dissolved oxygen, ferric sulphate, and hydrogen peroxide were used as oxidants were, respectively, 0.17, 0.02, and 7.13 ms−1. The dissolution of Ni in the presence of ferric sulphate occurred under surface chemical control, with an activation energy of 82.3 kJ/mol, while in the presence of hydrogen peroxide and dissolved oxygen the reaction seemed to have been mass transfer controlled. The dissolution of Ni in ferric sulphate solutions was also pH sensitive, possibly due to the formation of NiFe2O4 or NiO that was prevented when sulphuric acid concentration was 1 mol/L. The dissolution rate in ferric sulphate‐free solutions was affected negatively by temperature due to a decrease in O2 solubility.