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6.958 Aktuelle Fachpublikationen zum Thema temperature

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A protocol for amide bond formation with electron deficient amines and sterically hindered substrates

25.11.2015 | Maria E. Due-Hansen; Sunil K. Pandey; Elisabeth Christiansen; Rikke Andersen; Steffen V. F. Hansen; Trond Ulven, Organic & Biomolecular Chemistry, 2015

A protocol for amide coupling by in situ formation of acyl fluorides and reaction with amines at elevated temperature has been developed and found to be efficient for coupling of sterically hindered substrates and electron deficient amines where standard methods failed. 2015 Hot Articles in ...


A complete TSDC description of molecular mobilities in polylactide/starch blends from local to normal modes: Effect of composition, moisture, and crystallinity

20.11.2015 | Estrella Laredo, Dinorah Newman, Romina Pezzoli, Alejandro J. Müller, Alfredo Bello, Journal of Polymer Science Part B: Polymer Physics, 2015

ABSTRACT Thermally stimulated depolarization current is applied to study the dielectric relaxations coexisting from 80 to 380 K in the PLLA/starch, immiscible biodegradable blend system. The relaxation parameters are determined for chain mobilities at different ranges, whether in the amorphous ...


Substrate Controlled Synthesis of Benzisoxazole and Benzisothiazole Derivatives via PhI(OAc)2-Mediated Oxidation Followed by Intramolecular Oxidative O–N/S–N Bond Formation

20.11.2015 | Devireddy Anand; Om P. S. Patel; Rahul K. Maurya; Ruchir Kant; Prem P. Yadav, The Journal of Organic Chemistry, 2015

A phenyliodine(III) diacetate (PIDA)-mediated, highly efficient and tandem approach for the synthesis of aryldiazenylisoxazolo(isothiazolo)arenes from simple 2-amino-N′-arylbenzohydrazides has been developed. The reaction proceeds via formation of (E)-(2-aminoaryl)(aryldiazenyl)methanone as the ...


Competing insertion and external binding motifs in hydrated neurotransmitters: IR spectra of protonated phenylethylamine monohydrate

19.11.2015 | Aude Bouchet, Markus Schütz, Otto Dopfer, ChemPhysChem, 2015

Hydration has a drastic impact on the structure and function of flexible biomolecules such as aromatic ethylamino neurotransmitters. The structure of monohydrated protonated phenylethylamine (H+PEA‐H2O) is investigated by infrared photodissociation (IRPD) spectroscopy of cold cluster ions using ...


Mechanism of oxygen sensing on β‐Ga2O3 single‐crystal sensors for high temperatures

19.11.2015 | M. Bartic, physica status solidi (a), 2015

The oxygen‐sensing mechanism on gallium oxide sensors has been analyzed in the presence of an oxygen gas flow at elevated temperatures: 700, 750, 800, 850, 900, 950, and 1000 °C. For the present study, the sensors were prepared based on a β‐Ga2O3 single crystal in a sandwich structure using ...


Metal‐organic CVD of Y2O3 Thin Films using Yttrium tris‐amidinates 

19.11.2015 | Sarah Karle, Van‐Son Dang, Marina Prenzel, Detlef Rogalla, Hans‐Werner Becker, Anjana Devi, Chemical Vapor Deposition, 2015

Thin films of Y2O3 are deposited on Si(100) and Al2O3 (0001) substrates via metal‐organic (MO)CVD for the first time using two closely related yttrium tris‐amidinate compounds as precursors in the presence of oxygen in the temperature range 400–700 °C. The structural, morphological, and ...


Development of polar order in the liquid crystal phases of a 4 cyanoresorcinol based bent‐core mesogen with fluorinated azobenzene wings

19.11.2015 | Mohamed Alaasar, Marko Prehm, Gabriela Tamba, Nerea Sebastian, Alexey Eremin, Carsten Tschierske, ChemPhysChem, 2015

A bent‐core mesogen consisting of a 4‐cyanoresorcinol unit as the central core and laterally fluorinated azobenzene wings forms four different smectic LC phase structures in the sequence SmA ‐ SmCs ‐SmCsPAR ‐ M, all involving polar SmCsPS domains with growing coherence length of tilt and polar ...


Influence of Cold Low Pressure Lamination Parameters on the Joining of Low Temperature Co‐Fired Ceramics Green Tapes and Sintered Alumina Substrates

19.11.2015 | Michael Hambuch, Christoph Hutzler, Frieder Gora, Frieder Wittmann, Karin Beart, Andreas Roosen, International Journal of Applied Ceramic Technology, 2015

In this study, laminates consisting of sintered alumina substrates and green Low Temperature Co‐fired Ceramics (LTCC) tapes have been produced via Cold Low Pressure Lamination which is based on adhesive tapes for joining of layers at room temperature and pressures


Formation of 4(5)‐Methylimidazole in Aqueous d‐Glucose‐Amino Acids Model System

18.11.2015 | Faris Karim, J. Scott Smith, Journal of Food Science, 2015

Abstract The International Agency for Research on Cancer (IRAC) has classified 4(5)‐methylimidazole (4‐MeI) as a group 2B possible human carcinogen. Thus, how 4‐MeI forms in a d‐glucose (Glu) amino acids (AA) model system is important, as it is how browning is affected. An aqueous solution of ...


Benign Perfluoroalkylation of Aniline Derivatives through Photoredox Organocatalysis under Visible‐Light Irradiation

18.11.2015 | Sebastián Barata‐Vallejo, Damian E. Yerien, Al Postigo, European Journal of Organic Chemistry, 2015

Abstract In this work, we present a room‐ or solar‐light‐initiated transition‐metal‐free radical homolytic aromatic substitution (HAS) reaction of aniline derivatives with perfluoroalkyl moieties employing perfluoroalkyl halides as readily available perfluoroalkyl sources in the presence of ...


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