bluuebunny/crossref_metadata_2025_split huggingface dataset:
Synthesis and properties of highly hydrophilic waterborne polyurethane‐ureas containing various hardener content for waterproof breathable fabrics
Authors: Kim Eun‐Young , Lee Jung‐Hee , Lee Dong‐Jin , Lee Young‐Hee , Lee Jang‐Hun , Kim Han‐Do 
Published: December 2012

AbstractAs part of an ongoing search for highly hydrophilic waterborne polyurethanes for waterproof breathable fabrics, a waterborne polyurethane [waterborne polyurethane‐ureas (WBPU): P70, the number indicates the poly(ethylene glycol) (PEG) content] dispersion was synthesized from PEG (70 wt %) and dimethylol propionic acid (14 mol %) as the hydrophilic/ionic components, 4,4′‐diisocyanato dicyclohexylmethane as a diisocyanate, ethylenediamine as a chain extender, and aliphatic tri‐isocyanate as a hardener. To determine the best highly hydrophilic WBPU coatings for waterproof breathable fabrics, this study focused on the effect of the hardener content(0–1.2 wt %) in the WBPU P70 sample on the dynamic thermal mechanical properties, contact angle/surface energy, water swelling, water insolubility, and water vapor transmission rate (WVTR). The contact angle, water swelling, glass transition temperature, modulus, and strength increased with increasing hardener content, whereas the surface energy, water insolubility, and WVTR decreased. Sample P70/0.5 (cured sample containing 0.5 wt % of hardener) showed relatively good dimensional stability in water (high water insolubility), strong hydrophilicity (low‐water contact angle/high‐surface energy/high water absorption), and a high WVTR, highlighting its promising applications in waterproof breathable fabrics. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
The potential of flavonoids as natural antioxidants and UV light stabilizers for polypropylene
Authors: Samper M. D. , Fages E. , Fenollar O. , Boronat T. , Balart R. 
Published: December 2012

AbstractThis article presents a study on the stabilization of polypropylene against thermo‐oxidation and UV radiation by using natural phenolic compounds derived from the structures of flavonoids: a flavone (chrysin), a flavanol (quercetin), two flavanone glycosides (hesperidin and naringin), and flavanoligand (silibinin). Thermal stabilization has been assessed in an oxidizing atmosphere by means of differential scanning calorimetry both in isothermal and in dynamic conditions. In addition, the effectiveness of these phenolic compounds as thermal stabilizers at high temperature has been quantified with the use of thermogravimetric analysis. Stabilization against UV radiation has been estimated by studying the morphology changes of the exposed surfaces by scanning electron microscope (SEM); also, surface chemical changes have been followed by infrared spectroscopy. Global results show that flavonoid compounds of type flavonols (quercetin and silibinin) provide the best results in stabilizing both against oxidation and against the action of UV radiation. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
ChemInform Abstract: Dielectric Properties of a Polar ZnSnO3 with LiNbO3‐Type Structure.
Authors: Inaguma Yoshiyuki , Sakurai Daichi , Aimi Akihisa , Yoshida Masashi , Katsumata Tetsuhiro , Mori Daisuke , Yeon Jeongho , Halasyamani P. Shiv 
Published: December 2012

AbstractThe title compound is synthesized by solid state reaction of a stoichiometric mixture of ZnO and SnO2 (7—8 GPa, 850—1000 °C, 30—60 min).
ChemInform Abstract: Ca3Sm3[Si9N17] and Ca3Yb3[Si9N17] Nitridosilicates with Interpenetrating Nets that Consist of Star‐Shaped [N[4](SiN3)4] Units and [Si5N16] Supertetrahedra.
Authors: Huppertz Hubert , Oeckler Oliver , Lieb Alexandra , Glaum Robert , Johrendt Dirk , Tegel Marcus , Kaindl Reinhard , Schnick Wolfgang 
Published: December 2012

AbstractThe new title compounds are prepared by reactions of the pure metals with “Si(NH)2” in a radio‐frequency furnace at 1650 °C for 12 h.
ChemInform Abstract: Fluorinated Alcohols as Promoters for the Metal‐Free Direct Substitution Reaction of Allylic Alcohols with Nitrogenated, Silylated, and Carbon Nucleophiles.
Authors: Trillo Paz , Baeza Alejandro , Najera Carmen 
Published: December 2012

AbstractTrifluoroethanol and hexafluoroisopropanol efficiently promote the title reactions which allow facile formation of diverse alkenes.
ChemInform Abstract: Application of Recyclable Ionic Liquid‐Supported Imidazolidinone Catalyst in Enantioselective Diels—Alder Reactions.
Authors: Shen Zhi‐Liang , Cheong Hao‐Lun , Lai Yin‐Chang , Loo Wan‐Yi , Loh Teck‐Peng 
Published: December 2012

AbstractDiels—Alder reactions involving both alkyl‐ and aryl‐substituted α,β‐unsaturated aldehydes (I) and cyclopentadiene (II) proceed efficiently in the presence of the title catalyst and trifluoroacetic acid as the acidic co‐catalyst.
ChemInform Abstract: The Remarkable Effect of a Simple Ion: Iodide‐Promoted Transfer Hydrogenation of Heteroaromatics.
Authors: Wu Jianjun , Wang Chao , Tang Weijun , Pettman Alan , Xiao Jianliang 
Published: December 2012

AbstractThe new method for the reduction of quinolines, isoquinolines, and quinoxalines is based on the use of an azeotropic HCOOH/Et3N mixture as hydrogen source, very low loadings of the rhodium catalyst, and catalytic or stoichiometric amounts of KI.
ChemInform Abstract: Stereoselective Synthesis of Monofluoroalkyl α,β‐Unsaturated Ketones from Allenyl Carbinol Esters Mediated by Gold and Selectfluor.
Authors: Jin Zhuang , Hidinger Rachel S. , Xu Bo , Hammond Gerald B. 
Published: December 2012

AbstractSequential treatment of allenyl carbinol esters with the gold catalyst and Selectfluor results in efficient and selective formation of monofluorinated (E)‐enones like (III) and (V).
ChemInform Abstract: Practical Oxidative Homo‐ and Heterocoupling of Terminal Alkynes Catalyzed by Immobilized Copper in MCM‐41.
Authors: Xiao Ruian , Yao Ruiya , Cai Mingzhong 
Published: December 2012

AbstractThe catalyst can be recovered by filtration and used in at least ten reaction runs without significant loss of activity.
ChemInform Abstract: Highly Efficient One‐Pot, Three‐Component Synthesis of β‐Aminoketones Catalyzed by Fe(O2CCF3)3.
Authors: Zhang Min , Xiong Biao , Yang Wei , Chen Ling , Wu Feng , Wang Quan , Ding Yuqiang 
Published: December 2012

AbstractThis methodology can be employed to synthesize a wide range of target compounds and to introduce different functional groups into the β‐aminoketone skeleton.
ChemInform Abstract: Silica Gel Promotes Reductions of Aldehydes and Ketones by N‐Heterocyclic Carbene Boranes.
Authors: Taniguchi Tsuyoshi , Curran Dennis P. 
Published: December 2012

AbstractOne, two, or all three of the boron hydrides of carbene borane NHC and its dimethyl analogue can be transferred to the aldehydes and ketones to give primary and secondary alcohols under ambient conditions and in the presence of SiO2, which is crucial for the rapid reduction.
ChemInform Abstract: Practical One‐Pot Preparation of Ketones from Aryl and Alkyl Bromides with Aldehydes and DIH via Grignard Reagents.
Authors: Dohi Souya , Moriyama Katsuhiko , Togo Hideo 
Published: December 2012

AbstractVarious aromatic or aliphatic ketones are obtained in a transition‐metal‐free one‐pot reaction of aromatic or aliphatic halides and aldehydes with DIH via Grignard reagents.
ChemInform Abstract: General and Highly Efficient Fluorinated‐N‐heterocyclic Carbene—Based Catalysts for the Palladium‐Catalyzed Suzuki—Miyaura Reaction.
Authors: Liu Taoping , Zhao Xiaoming , Shen Qilong , Lu Long 
Published: December 2012

AbstractThis paper demonstrates that a trifluoromethylated imidazolium salt is a highly reactive and practical catalyst for Suzuki—Miyaura coupling of aryl and heteroaryl chlorides, bromides and triflates.
ChemInform Abstract: One‐Pot Synthesis of Symmetrical and Unsymmetrical Diarylmethanes via Diborylmethane.
Authors: Endo Kohei , Ishioka Takafumi , Ohkubo Takahiro , Shibata Takanori 
Published: December 2012

AbstractDiarylethanes and diarylbutenes are also available.
ChemInform Abstract: Synthesis and Structure of 2,3‐Bis(5‐tert‐butyl‐2‐methoxyphenyl)buta‐1,3‐diene by Bromine Elimination of (Z)‐1,4‐Dibromo‐2,3‐bis(5‐tert‐butyl‐2‐methoxyphenyl)‐2‐butene.
Authors: Tazoe Kazuya , Uchikawa Yuki , Feng Xing , Yamato Takehiko 
Published: December 2012

AbstractCompounds (IV), (V), and (VI) are prepared for the first time.
ChemInform Abstract: Broensted Acid‐Catalyzed Cycloisomerization of But‐2‐yne‐1,4‐diols with or without 1,3‐Dicarbonyl Compounds to Tri‐ and Tetrasubstituted Furans.
Authors: Mothe Srinivasa Reddy , Lauw Sherman Jun Liang , Kothandaraman Prasath , Chan Philip Wai Hong 
Published: December 2012

AbstractIn the presence of TosOH butyne‐4,4‐diols are found to undergo convenient cyclization to afford various trisubstituted furans.
ChemInform Abstract: Reactivity of Various α‐Halo Ketones in One‐Pot Synthesis of γ‐Iminolactones.
Authors: Asghari Sakineh , Habibi Ahmad Khabbazi 
Published: December 2012

AbstractThe three‐component reaction of tert‐butyl isocyanide, acetylenedicarboxylate (II) and α‐halo ketones affords halogenated iminolactones (IV) (22 examples) as the sole products.
ChemInform Abstract: Efficient Iodine Catalyzed Three Components Domino Reaction for the Synthesis of 1‐((Phenylthio)(phenyl)methyl)pyrrolidin‐2‐one Derivatives Possessing Anticancer Activities.
Authors: Ramachandran Gunasekar , Karthikeyan Natesan S. , Giridharan Periyasamy , Sathiyanarayanan Kulathu I. 
Published: December 2012

AbstractA novel, simple, mild, and faster synthesis of the title compounds is developed from readily available starting materials including a convenient work‐up.
ChemInform Abstract: Olefinic C—H Bond Addition to Aryl Aldehyde and Its N‐Sulfonylimine via Rh Catalysis.
Authors: Li Yang , Zhang Xi‐Sha , Zhu Qi‐Lei , Shi Zhang‐Jie 
Published: December 2012

AbstractBenzaldimines or benzaldehydes undergo the title reaction with 5‐ to 7‐membered 1‐pyridylcycloalkenes to give the corresponding cyclic vinyl amines and vinyl alcohols.
ChemInform Abstract: Approach to Polysubstituted 4‐Pyridones from N‐Aryl Acetoacetamides via a N to C 1,3‐Acyl Migration Mediated by Sodium Persulfate.
Authors: Zhang Zhiguo , Fang Shiliang , Liu Qingfeng , Zhang Guisheng 
Published: December 2012

AbstractIn the presence of sodium persulfate, N‐aryl acetoacetamides undergo self‐condensation and novel 1,3‐acyl migration to afford biologically important polysubstituted 4‐pyridones.
ChemInform Abstract: Palladium‐Catalyzed Sequential Formation of C—C Bonds: Efficient Assembly of 2‐Substituted and 2,3‐Disubstituted Quinolines.
Authors: Ji Xiaochen , Huang Huawen , Li Yibiao , Chen Huoji , Jiang Huanfeng 
Published: December 2012

AbstractThe title quinolines are prepared from anilines, aldehydes, and terminal olefins.
ChemInform Abstract: Synthesis of Imidazopyridines from the Morita—Baylis—Hillman Acetates of Nitroalkenes and Convenient Access to Alpidem and Zolpidem.
Authors: Nair Divya K. , Mobin Shaikh M. , Namboothiri Irishi N. N. 
Published: December 2012

AbstractIn the absence of reagents, acetates (I) and 2‐aminopyridines undergo a highly regioselective cascade inter‐/intramolecular double aza‐Michael addition reaction to give the title compounds within one hour.
ChemInform Abstract: An Efficient Synthesis of Pyrrolo[2,3,4‐kl]acridin‐1‐one Derivatives Catalyzed by L‐Proline.
Authors: Wang Huiyang , Li Lili , Lin Wei , Xu Pan , Huang Zhibin , Shi Daqing 
Published: December 2012

AbstractA variety of isatin derivatives and cyclic enaminones (II) or (IV) are transformed to dihydropyrroloacridines (III) (25 examples) or pyrroloacridines (VI) (13 examples), correspondingly.
ChemInform Abstract: One‐Step Cyclization: Synthesis of N‐Heteroalkyl‐N′‐tosylpiperazines.
Authors: Huang Jianying , Xu Weiyuan , Xie Hujun , Li Shijun 
Published: December 2012

AbstractBase‐mediated treatment of the protected amino alcohol (I) with amines results in mild and convenient formation of a number of N≈‐alkylated tosylpiperazines including heteroalkyl‐substituted ones.
ChemInform Abstract: A General Approach to the Synthesis of Enantiopure 19‐nor‐Vitamin D3 and Its C‐2 Phosphate Analogues Prepared from Cyclohexadienyl Sulfone.
Authors: Sikervar Vikas , Fleet James C. , Fuchs Philip L. 
Published: December 2012

AbstractEnantiopure 19‐nor‐vitamin D3 (III) is prepared via alkylation of dianion of sulfone (I) with allyl chloride (II) followed by 1,2‐eliminative desulfonylation with concomitant silyl ether deprotection as key steps.
ChemInform Abstract: Asymmetric Catalytic Synthesis of the Proposed Structure of Trocheliophorolide B.
Authors: Trost Barry M. , Quintard Adrien 
Published: December 2012

AbstractThe key steps of the route are the successive asymmetric acetaldehyde alkynylation, the asymmetric ruthenium catalyzed alkene—alkyne coupling, and an unprecedented catalytic ynone cross‐aldol condensation.
ChemInform Abstract: The Prolific {ZR6}X12R and {ZR6}X10 Structure Types with Isolated Endohedrally Stabilized (Z) Rare‐Earth Metal (R) Cluster Halide (X) Complexes
Authors: Rustige Christian , Bruehmann Matthias , Steinberg Simon , Meyer Eva , Daub Kathrin , Zimmermann Sina , Wolberg Marike , Mudring Anja‐Verena , Meyer Gerd 
Published: December 2012

AbstractReview: 43 refs.
Contribution to the Global Warming Mitigation of Marshlands Conversion to Croplands in the Sanjiang Plain, Northeast China
Authors: Liu Xiao‐Hui , Dong Gui‐Hua , Zhang Yuan , Lu Xian‐Guo , Jiang Ming 
Published: December 2012

AbstractBased on the estimation of greenhouse gases (GHG) emissions and carbon sequestration of the total conversion of marshlands (TMC), marshlands conversion to paddy fields (MCPFs) and marshlands conversion to uplands (MCULs), this study revealed the contribution to the global warming mitigation (CGWM) of paddy fields versus uplands converted from marshlands in the Sanjiang Plain (excluding the Muling‐Xingkai Plain on south of Wanda Mountain), Heilongjiang Province, northeast China. The results showed that the total area of MCPFs and MCULs was 504.23 × 103 ha between 1982 and 2005. The CGWM per unit area was 45.53 t CO2eq/ha for MCPFs and that was 23.95 t CO2eq/ha for MCULs, with an obvious 47.40% reduction. The MCPFs and MCULs ecosystems acted as the carbon sink all of the year. As far as CGWM per unit area is concerned, MCPFs mitigated the greenhouse effect which was greater than MCULs. And it was effective that the implementation of the uplands transformed into paddy fields in Northeast China with regard to marshlands protection and croplands (including paddy fields and uplands) reclamation.
pH‐Responsive Drug Delivery by Amphiphilic Copolymer through Boronate–Catechol Complexation
Authors: Wu Suhong , Qi Ruogu , Kuang Huihui , Wei Yen , Jing Xiabin , Meng Fanbo , Huang Yubin 
Published: December 2012

AbstractStimuli‐responsive micellar nanoparticles are gaining considerable attention in the field of drug delivery because of their great advantages of high efficiency in tumor accumulation through the enhanced permeability and retention effect and rapid drug release. In this study, a novel catechol moiety‐containing amphiphilic, biodegradable polymeric carrier, monomethoxy poly(ethylene glycol)‐block‐poly(ε‐caprolactone)‐block‐poly(L‐lysine)‐graft‐[3‐(3,4‐dihydroxyphenyl)propionic acid], was employed for delivery of the anticancer drug bortezomib (BTZ) to cancer cells. The strategy is based on the facile conjugation of BTZ to catechol‐containing polymeric carriers through boronate formation, which could dissociate in acidic environments to liberate its payload BTZ to inhibit proteasome function. This reducing BTZ–catechol interaction with decreasing pH value was demonstrated by microcalorimetry analysis using isothermal titration calorimetry. Notably, the obtained micellar BTZ complex that self‐assembled from drug‐loaded amphiphilic polymer was internalized effectively by MCF‐7 breast cancer cells and resulted in significant 26S proteasome inhibition. Furthermore, the micellar BTZ complex induced remarkable apoptosis on MCF‐7 and HeLa cancer cells and exhibited little toxicity on HEK293 normal cells. More importantly, systemic delivery of micellar BTZ complex prolonged its blood circulation and resulted in significant accumulation in the tumor site relative to free drug, thus suggesting therapeutic promise for micellar BTZ delivery in cancer therapy.
Visible‐Light Photocatalytic Degradation of Methylene Blue Using SnO2/α‐Fe2O3 Hierarchical Nanoheterostructures
Authors: Zhang Shouwei , Li Jiaxing , Niu Haihong , Xu Wenqing , Xu Jinzhang , Hu Wenping , Wang Xiangke 
Published: December 2012

AbstractThree‐dimensional SnO2/α‐Fe2O3 semiconductor hierarchical nanoheterostructures were synthesized for photocatalysis through a low‐cost and environmentally friendly hydrothermal strategy, by crystallographic‐oriented epitaxial growth of SnO2 on three‐dimensional α‐Fe2O3 flowerlike hierarchical nanostructures. In this photocatalyst, visible‐light‐active Fe2O3 flowerlike hierarchical nanostructures were used as a medium to absorb photons and convert them into photogenerated charges, and SnO2 nanoparticles were used as charge collectors to transport the photogenerated charges. The SnO2/α‐Fe2O3 semiconductor hierarchical nanoheterostructures exhibited excellent visible‐light photocatalytic ability for the degradation of methylene blue; this was attributed to the large specific surface area, wide visible‐light absorption range, and efficient electron–hole pair separation properties of the SnO2/α‐Fe2O3 nanoheterostructures. The SnO2/α‐Fe2O3 material showed improved separation of photogenerated electron–hole pairs owing to the potential‐energy differences between SnO2 and α‐Fe2O3, and therefore exhibited enhanced photocatalytic activity. This paper highlights the SnO2/α‐Fe2O3 semiconductor hierarchical nanoheterostructures as potentially more environmentally friendly materials for use in organic pollutant degradation for environmental pollution cleanup operations.
Social interdependence in close relationships: The actor–partner‐interdependence–investment model (API‐IM)
Authors: Macher Silvia 
Published: December 2012

AbstractThis article introduces the actor–partner‐interdependence–investment model (API‐IM) that was developed to add a dyadic perspective to Rusbult's investment model. The API‐IM is based on interdependence theoretical assumptions and the actor–partner interdependence model. Two studies were conducted to investigate the reliability of the API‐IM. Relationship satisfaction, investment size, quality of alternatives, and relationship commitment were assessed at both partners of 77 (Study 1) and 162 (Study 2) married and unmarried heterosexual couples. Path analyses that applied a structural equation modeling framework revealed a dyadic model that significantly predicts women's and men's commitment by actor effects of satisfaction, investments, and alternatives, and partner effects of satisfaction. Actor and partner effects of satisfaction were significantly moderated by relationship duration and marital status. Marital status also significantly moderated the actor effect of alternatives. The API‐IM supports the concept of social interdependence in close relationships, and it is discussed as a sound dyadic extension of the investment model. Copyright © 2012 John Wiley & Sons, Ltd.
A Novel One‐Pot Synthesis of UV‐Blue ZnSe Nanocrystals in Aqueous Solution
Authors: Fu Shasha , Sun Qizhuang , Li Dingyun , Dong Meiting , Liu Shuxian , Huang Chaobiao 
Published: December 2012

AbstractDescribed herein is a novel one‐pot aqueous synthesis of ZnSe nanocrystals has featuring the utilization of Na2SeO3 and Zn(AC)2×2H2O as Se and Zn source, glutathione (GSH) as stabilizing agent and reducing agent. By this approach, the UV‐blue ZnSe QDs with quantum yield (QYs) up to 19% have been synthesized with a molar ratio of Se/Zn/GSH at 1:4:8.5 under aqueous conditions at 110 °C. XRD and TEM show the ZnSe QDs are zinc cubic structure particles with an average diameter of 3–5 nm.
NF‐κB mediated miR‐26a regulation in cardiac fibrosis
Authors: Wei Chuanyu , Kim Il‐Kwon , Kumar Sandeep , Jayasinghe Samantha , Hong Nayeon , Castoldi Giovanna , Catalucci Daniele , Jones W. Keith , Gupta Sudhiranjan 
Published: December 2012

AbstractMicro‐RNAs (miRNAs) are a class of small non‐coding RNAs, recently emerged as a post‐transcriptional regulator having a key role in various cardiac pathologies. Among them, cardiac fibrosis that occurs as a result from an imbalance of extracellular matrix proteins turnover and is a highly debilitating process that eventually lead to organ dysfunction. An emerging theme on is that miRNAs participate in feedback loop with transcription factors that regulate their transcription. NF‐κB, a key transcription factor regulator controls a series of gene program in various cardiac diseases through positive and negative feedback mechanism. But, NF‐κB mediated miRNA regulation in cardiac fibrosis remains obscure. Bioinformatics analysis revealed that miR‐26a has targets collagen I and CTGF and possesses putative NF‐κB binding element in its promoter region. Here, we show that inhibition of NF‐κB in cardiac fibroblast restores miR‐26a expression, attenuating collagen I, and CTGF gene expression in the presence of Ang II, conferring a feedback regulatory mechanism in cardiac fibrosis. The target genes for miR‐26a were confirmed using 3′‐UTR luciferase reporter assays for collagen I and CTGF genes. Using NF‐κB reporter assays, we determine that miR‐26a overexpression inhibits NF‐κB activity. Finally, we show that miR‐26a expression is restored along with the attenuation of collagen I and CTGF genes in cardiac specific IkBa triple mutant transgenic mice (preventing NF‐κB activation) subjected to 4 weeks transverse aortic banding (TAC), compared to wild type (WT) mice. The data indicate a potential role of miR‐26a in cardiac fibrosis and, offer novel therapeutic intervention. J. Cell. Physiol. 228: 1433–1442, 2013. © 2012 Wiley Periodicals, Inc.
Itch, an E3 ligase of Oct4, is required for embryonic stem cell self‐renewal and pluripotency induction
Authors: Liao Bing , Zhong Xiaoming , Xu Huiming , Xiao Feng , Fang Zhuoqing , Gu Junjie , Chen Yue , Zhao Yingming , Jin Ying 
Published: December 2012

AbstractItch, a C2‐WW‐HECT domain ubiquitin E3 ligase, plays an important role in various biological processes. However, its role in embryonic stem cells (ESCs) remains unknown. Here, we report that Itch interacts with and targets pluripotency‐associated transcription factor Oct4 for ubiquitination. Moreover, Itch enhances Oct4 transcriptional activities and controls Oct4 protein stability dependent on its catalytic activity. Importantly, silencing Itch expression compromises ESC self‐renewal capacity and somatic cell reprogramming efficiency. Taken together, our study identifies Itch as a regulator of Oct4 stability and transcriptional activity, establishing a functional link between an E3 ligase and the regulation of pluripotency. J. Cell. Physiol. 228: 1443–1451, 2013. © 2012 Wiley Periodicals, Inc.