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5.719 Aktuelle Fachpublikationen zum Thema temperature

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ChemInform Abstract: A Mild and Simple One‐Pot Synthesis of 2‐Substituted Benzimidazole Derivatives Using DDQ as an Efficient Oxidant at Room Temperature.

22.05.2015 | Hossein Naeimi, Zahra Babaei, ChemInform, 2015

Abstract A wide range of the title compounds (III) (14 examples) are smoothly and efficiently synthesized by one‐pot reaction of o‐phenylenediamine (I) with various aromatic aldehydes under mild reaction conditions.

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Controllable Synthesis of Stereoregular Polyesters by Organocatalytic Alternating Copolymerizations of Cyclohexene Oxide and Norbornene Anhydrides

22.05.2015 | Bing Han; Li Zhang; Binyuan Liu; Xiaofang Dong; Il Kim; Zhongyu Duan; Patrick Theato, Macromolecules, 2015

A facile strategy has been demonstrated for the selective synthesis of highly stereoregular polyesters with cis-2,3-(exo, exo) or trans-2,3-(exo, endo) repeating units by the organocatalysts mediated alternating copolymerization of cyclohexene oxide and norbornene anhydride (NA) stereoisomers. ...

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Resistivity Enhancement and Transport Mechanisms in (1 − x)BaTiO3–xBi(Zn1/2Ti1/2)O3 and (1 − x)SrTiO3–xBi(Zn1/2Ti1/2)O3

21.05.2015 | Nitish Kumar, David P. Cann, Journal of the American Ceramic Society, 2015

Ceramics of composition (1−x)BaTiO3–xBi(Zn1/2Ti1/2)O3 (BT‐BZT) were prepared by solid‐state synthesis; they have been shown to exhibit excellent properties suited for high‐temperature dielectric applications. The X‐ray diffraction data showed a single‐phase perovskite structure for all the ...

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Synthesis and Luminescence properties in H2 annealing Mn-doped Y3Al5O12:Ce3+ single crystal for W-LEDs

20.05.2015 | Guorui Gu; Weidong Xiang; Cheng Yang; Xiaojuan Liang, CrystEngComm, 2015

Czochralski grown Mn-doped Y3Al5O12:Ce3+ single crystal was thermally annealed in H2 atmosphere at different temperature for 6 h and the corresponding absorption spectra, emission spectra, quantum yield (QY) and color-electric performance of Ce,Mn:YAG single crystal wafers were investigated ...

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Infrared Nonlinear Optical Properties of Lithium-containing Diamond-Like Semiconductors Li2ZnGeSe4 and Li2ZnSnSe4

20.05.2015 | Jian-Han Zhang; Daniel Clark; Jacilynn Brant; Charles Sinagra; Yong Kim; Joon Jang; Jennifer A. Aitken, Dalton Transactions, 2015

Two new lithium-containing diamond-like semiconductors, Li2ZnGeSe4 and Li2ZnSnSe4, have been prepared by high-temperature, solid-state synthesis. Single crystal X-ray diffraction reveals that both compounds adopt the wurtz-kesterite structure type, crystallizing in the noncentrosymmetric space ...

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Aqueous Synthesis and Visible‐Light Photochromism of Metastable h‐WO3 Hierarchical Nanostructures

19.05.2015 | Na Li, Yan Zhao, Yi Wang, Yan Lu, Yuehong Song, Zhifang Huang, Yawen Li, Jingzhe Zhao, European Journal of Inorganic Chemistry, 2015

Abstract A facile aqueous approach to the synthesis of metastable hexagonal tungsten oxide (h‐WO3) hierarchical nanostructures at low temperature was investigated. The spherelike h‐WO3 architectures are constructed from 1D nanorods. Polyvinyl pyrrolidone (PVP) in the reaction system ...

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A Combined Experimental and Theoretical Study of the Ammonium Bifluoride Catalyzed Regioselective Synthesis of Quinoxalines and Pyrido[2,3-b]pyrazines

19.05.2015 | Frédéric Lassagne; Floris Chevallier; Thierry Roisnel; Vincent Dorcet; Florence Mongin; Luis R. Domingo, Synthesis, 2015

SynthesisDOI: 10.1055/s-0034-1380678 Ammonium bifluoride was efficiently used at a 0.5 mol% loading to catalyze the cyclocondensation of 1,2-arylenediamines with 1,2-dicarbonyl compounds at room temperature in methanol–water to give quinoxalines or pyrido[2,3-b]pyrazines in excellent yields. ...

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ChemInform Abstract: KOtBu‐Mediated Aerobic Transition‐Metal‐Free Regioselective β‐Arylation of Indoles: Synthesis of β‐(2‐/4‐Nitroaryl)‐indoles.

15.05.2015 | Shailesh Kumar, Vandana Rathore, Ajay Verma, Ch. Durga Prasad, Amit Kumar, Abhimanyu Yadav, Sadhan Jana, Moh. Sattar ..., ChemInform, 2015

Abstract β‐Arylation in unprotected indoles can be achieved chemo‐ and regioselectively by employing KOtBu at room temperature in air without using a transition metal catalyst and aryl halide coupling partner.

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Chelating Energetic Material Nickel Semicarbazide 2,4,6‐Trinitroresorcinol: Synthesis, Structure, and Thermal Behavior

15.05.2015 | Qian‐You Wang, Wen‐Chao Tong, Chao Ma, Tong‐Lai Zhang, Li Yang, Zeitschrift für anorganische und allgemeine Chemie, 2015

Abstract Through a one‐pot reaction of NiCO3·2Ni(OH)2·H2O, aminourea hydrochloride (SCZ·HCl) and 2,4,6‐trinitroresorcinol (TNR), a halogen‐free and lead‐free chelating energetic material (CEM) [Ni(SCZ)3]TNR was synthesized. We confirmed the structure of [Ni(SCZ)3]TNR by infrared spectroscopy, ...

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Valorization of Sal Deoiled Cake as Media for Acidic Amylase and Invertase Co‐Production by Aspergillus niger NJ‐1: Optimization by Response Surface Methodology and Application in Oligosaccharide Synthesis

14.05.2015 | Samsher Singh, Neetu Gupta, Jasdeep Kaur, Anshu Gupta, Journal of Food Processing and Preservation, 2015

Abstract Valorization of Sal deoiled cake (DOC) was studied by using it as cheap nutrient source for the co‐production and statistical optimization of two carbohydrases, acidic amylase and invertase, using a newly isolated strain Aspergillus niger NJ‐1 and assessment of produced enzymes in ...

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