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625 Aktuelle Fachpublikationen zum Thema temperature

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Can Helical Peptides Unwind One Turn at a Time? ‐ Controlled Conformational Transitions in α,β2,3‐Hybrid Peptides

15.05.2015 | Dhayalan Balamurugan, Kannoth M. Muraleedharan, Chemistry - A European Journal, 2015

Abstract Unfolding of helical trans‐β2,3‐hybrid peptides with (α–β)nα composition, when executed by increasing solvent polarity or temperature, proceeded in a systematic manner with the turns unwinding sequentially; C‐terminal region of these peptides were first to unwind and the process ...


Yolk‐Shell Porous Microspheres of Calcium Phosphate Prepared by Using Calcium L‐Lactate and Adenosine 5′‐Triphosphate Disodium Salt: Application in Protein/Drug Delivery

15.05.2015 | Guan‐Jun Ding, Ying‐Jie Zhu, Chao Qi, Tuan‐Wei Sun, Jin Wu, Feng Chen, Chemistry - A European Journal, 2015

Abstract A facile and environmentally friendly approach has been developed to prepare yolk‐shell porous microspheres of calcium phosphate by using calcium L‐lactate pentahydrate (CL) as the calcium source and adenosine 5′‐triphosphate disodium salt (ATP) as the phosphate source through the ...


Coordination Polymer Flexibility Leads to Polymorphism and Enables a Crystalline Solid–Vapour Reaction: A Multi‐technique Mechanistic Study

11.05.2015 | Iñigo J. Vitórica‐Yrezábal, Stefano Libri, Jason R. Loader, Guillermo Mínguez Espallargas, Michael Hippler, Ashleigh ..., Chemistry - A European Journal, 2015

Abstract Despite an absence of conventional porosity, the 1D coordination polymer [Ag4(O2C(CF2)2CF3)4(TMP)3] (1; TMP=tetramethylpyrazine) can absorb small alcohols from the vapour phase, which insert into AgO bonds to yield coordination polymers [Ag4(O2C(CF2)2CF3)4(TMP)3(ROH)2] (1‐ROH; R=Me, ...


Oxidative Olefination of Anilides with Unactivated Alkenes Catalyzed by an (Electron‐Deficient η5‐Cyclopentadienyl)Rhodium(III) Complex Under Ambient Conditions

11.05.2015 | Yuji Takahama, Yu Shibata, Ken Tanaka, Chemistry - A European Journal, 2015

Abstract The oxidative olefination of sp2 CH bonds of anilides with both activated and unactivated alkenes using an (electron‐deficient η5‐cyclopentadienyl)rhodium(III) complex is reported. In contrast to reactions using this electron‐deficient rhodium(III) catalyst, [Cp*RhCl2]2 showed no ...


Highly Fluorescent Flavins: Rational Molecular Design for Quenching Protection Based on Repulsive and Attractive Control of Molecular Alignment

11.05.2015 | Haruka Suzuki, Ryo Inoue, Soichiro Kawamorita, Naruyoshi Komiya, Yasushi Imada, Takeshi Naota, Chemistry - A European Journal, 2015

Abstract Unprecedented intense fluorescent emission was observed for a variety of flavin compounds bearing a perpendicular cyclic imide moiety at the C7 position of an isoalloxazine platform. A series of alloxan‐substituted flavins was prepared selectively by reduction of the corresponding ...


Room Temperature Ring Expansion of N‐Heterocyclic Carbenes and BB Bond Cleavage of Diboron(4) Compounds

08.05.2015 | Sabrina Pietsch, Ursula Paul, Ian A. Cade, Michael J. Ingleson, Udo Radius, Todd B. Marder, Chemistry - A European Journal, 2015

Abstract We report the isolation and detailed structural characterization, by solid‐state and solution NMR spectroscopy, of the neutral mono‐ and bis‐NHC adducts of bis(catecholato)diboron (B2cat2). The bis‐NHC adduct undergoes thermally induced rearrangement, forming a six‐membered ...


Speciation Control During Suzuki–Miyaura Cross‐Coupling of Haloaryl and Haloalkenyl MIDA Boronic Esters

08.05.2015 | James W. B. Fyfe, Elena Valverde, Ciaran P. Seath, Alan R. Kennedy, Joanna M. Redmond, Niall A. Anderson, Allan J. B ..., Chemistry - A European Journal, 2015

Abstract Boronic acid solution speciation can be controlled during the Suzuki–Miyaura cross‐coupling of haloaryl N‐methyliminodiacetic acid (MIDA) boronic esters to enable the formal homologation of boronic acid derivatives. The reaction is contingent upon control of the basic biphase and is ...


Tautomerization‐Mediated Molecular Switching Between Six‐ and Seven‐Membered Rings Stabilized by Hydrogen Bonding

04.05.2015 | Golo Storch, Markus J. Spallek, Frank Rominger, Oliver Trapp, Chemistry - A European Journal, 2015

Abstract 1,3,4,6‐Tetraketones typically undergo keto–enol tautomerism forming bis‐enols stabilized by intramolecular hydrogen bonding in two six‐membered rings. However, 1,3,4,6‐tetraketones derived from the terpene ketone camphor and norcamphor exist as isomers with two distinguishable modes ...


Ligand‐Controlled CO2 Activation Mediated by Cationic Titanium Hydride Complexes, [LTiH]+ (L=Cp2, O)

04.05.2015 | Shi‐Ya Tang, Nicole J. Rijs, Jilai Li, Maria Schlangen, Helmut Schwarz, Chemistry - A European Journal, 2015

Abstract CO2 activation mediated by [LTiH]+ (L=Cp2, O) is observed in the gas phase at room temperature using electrospray‐ionization mass spectrometry, and reaction details are derived from traveling wave ion‐mobility mass spectrometry. Wheresas oxygen‐atom transfer prevails in the reaction ...


Hypercondensation of an Amino Acid: Synthesis and Characterization of a Black Glycine Polymer

01.05.2015 | Stefan Fox, Punam Dalai, Jean‐François Lambert, Henry Strasdeit, Chemistry - A European Journal, 2015

Abstract A granular material was obtained by thermal polymerization of glycine at 200 °C. It has been named “thermomelanoid” because of its strikingly deep‐black color. The polymerization process is mainly a dehydration condensation leading to conventional amide bonds, and also CC double ...


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