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571 Aktuelle Fachpublikationen zum Thema temperature

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Insight into the Mechanism of Hydrogenation of Amino Acids to Amino Alcohols Catalyzed by a Heterogeneous MoOx‐Modified Rh Catalyst

29.12.2014 | Masazumi Tamura, Riku Tamura, Yasuyuki Takeda, Yoshinao Nakagawa, Keiichi Tomishige, Chemistry - A European Journal, 2014

Abstract Hydrogenation of amino acids to amino alcohols is a promising utilization of natural amino acids. We found that MoOx‐modified Rh/SiO2 (Rh–MoOx/SiO2) is an efficient heterogeneous catalyst for the reaction at low temperature (323 K) and the addition of a small amount of MoOx ...

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BODIPY‐Based Fluorescent Thermometer as a Lysosome‐Targetable Probe: How the Oligo(ethylene glycols) Compete Photoinduced Electron Transfer

29.12.2014 | Hua Wang, Yongquan Wu, Yanlin Shi, Pan Tao, Xing Fan, Xinyan Su, Gui‐Chao Kuang, Chemistry - A European Journal, 2014

Abstract A novel BODIPY‐based fluorescent thermometer, which shows a lysosome‐targeting property, was successfully prepared. Due to the electron‐donating ability of the oligo(ethylene glycols), the photoinduced electron‐transfer pathway from morpholine to BODIPY dye is blocked. The ...

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Reversible Photoswitching of RNA Hybridization at Room Temperature with an Azobenzene C‐Nucleoside

23.12.2014 | Thomas Goldau, Keiji Murayama, Clara Brieke, Sabrina Steinwand, Padmabati Mondal, Mithun Biswas, Irene Burghardt, Jo ..., Chemistry - A European Journal, 2014

Abstract Photoregulation of RNA remains a challenging task as the introduction of a photoswitch entails changes in the shape and the stability of the duplex that strongly depend on the chosen linker strategy. Herein, the influence of a novel nucleosidic linker moiety on the photoregulation ...

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Highly Enantioselective Catalytic Asymmetric [2+2] Cycloadditions of Cyclic α‐Alkylidene β‐Oxo Imides with Ynamides

23.12.2014 | Kazuaki Enomoto, Harufumi Oyama, Masahisa Nakada, Chemistry - A European Journal, 2014

Abstract Highly enantioselective catalytic asymmetric [2+2] cycloadditions of cyclic α‐alkylidene β‐oxo imides with ynamides are described. The high reactivity of the cyclic α‐alkylidene β‐oxo imide allows the [2+2] cycloadditions of a hindered substrate with unreactive ynamides at low ...

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Functionalization of Hydride‐Terminated Photoluminescent Silicon Nanocrystals with Organolithium Reagents

22.12.2014 | Ignaz M. D. Höhlein, Arzu Angı, Regina Sinelnikov, Jonathan G. C. Veinot, Bernhard Rieger, Chemistry - A European Journal, 2014

Abstract Hydride‐terminated photoluminescent silicon nanocrystals (SiNCs) were functionalized with organolithium compounds. The reaction is proposed to proceed through cleavage of SiSi bonds and formation of a SiLi surface species. The method yields colloidally stabilized SiNCs at room ...

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A Facile Route to Backbone‐Tethered N‐Heterocyclic Carbene (NHC) Ligands via NHC to aNHC Rearrangement in NHC Silicon Halide Adducts

22.12.2014 | Heidi Schneider, David Schmidt, Udo Radius, Chemistry - A European Journal, 2014

Abstract The reaction of 1,3‐diisopropylimidazolin‐2‐ylidene (iPr2Im) with diphenyldichlorosilane (Ph2SiCl2) leads to the adduct (iPr2Im)SiCl2Ph2 1. Prolonged heating of isolated 1 at 66 °C in THF affords the backbone‐tethered bis(imidazolium) salt [(aHiPr2Im)2SiPh2]2+ 2 Cl− 2 (“a” denotes ...

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Quantum Size Effects in the Size–Temperature Phase Diagram of Gallium: Structural Characterization of Shape‐Shifting Clusters

22.12.2014 | Krista G. Steenbergen, Nicola Gaston, Chemistry - A European Journal, 2014

Abstract Finite temperature analysis of cluster structures is used to identify signatures of the low‐temperature polymorphs of gallium, based on the results of first‐principle Born–Oppenheimer molecular dynamics simulations. Pre‐melting structural transitions proceed from either the β‐ and/or ...

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Experimental and Theoretical Studies on the Rearrangement of 2‐Oxoazepane α,α‐Amino Acids into 2′‐Oxopiperidine β2,3,3‐Amino Acids: An Example of Intramolecular Catalysis

17.12.2014 | Diego Núñez‐Villanueva, M. Ángeles Bonache, Laura Lozano, Lourdes Infantes, José Elguero, Ibon Alkorta, M. Teresa Ga ..., Chemistry - A European Journal, 2014

Abstract Enantiopure β‐amino acids represent interesting scaffolds for peptidomimetics, foldamers and bioactive compounds. However, the synthesis of highly substituted analogues is still a major challenge. Herein, we describe the spontaneous rearrangement of 4‐carboxy‐2‐oxoazepane α,α‐amino ...

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General and Practical Formation of Thiocyanates from Thiols

17.12.2014 | Reto Frei, Thibaut Courant, Matthew D. Wodrich, Jerome Waser, Chemistry - A European Journal, 2014

Abstract A new method for the cyanation of thiols and disulfides using cyanobenziodoxol(on)e hypervalent iodine reagents is described. Both aliphatic and aromatic thiocyanates can be accessed in good yields in a few minutes at room temperature starting from a broad range of thiols with high ...

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Cooperative GeN Bond Activation in Aluminium‐Functionalised Aminogermanes and Spontaneous Imine Elimination via an Intermediate Germyl Cation

17.12.2014 | Werner Uhl, Jens Tannert, Christian Honacker, Marcus Layh, Zheng‐Wang Qu, Tobias Risthaus, Stefan Grimme, Chemistry - A European Journal, 2014

Abstract Hydrometallation of iPr2NGe(CMe3)(CCCMe3)2 with HM(CMe3)2 (M=Al, Ga) affords alkenyl–alkynylgermanes in which the Lewis‐acidic metal atoms are not coordinated by the amino N atoms but by the α‐C atoms of the ethynyl groups. These interactions result in a lengthening of the GeC ...

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