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6.876 Aktuelle Fachpublikationen zum Thema temperature

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Copper‐Catalyzed Propargylic Substitution of Dichloro Substrates: Enantioselective Synthesis of Trisubstituted Allenes and Formation of Propargylic Quaternary Stereogenic Centers

20.10.2014 | Hailing Li, David Grassi, Laure Guénée, Thomas Bürgi, Alexandre Alexakis, Chemistry - A European Journal, 2014

Abstract An easy and versatile Cu‐catalyzed propargylic substitution process is presented. Using easily prepared prochiral dichloro substrates, readily available Grignard reagents together with catalytic amount of copper salt and chiral ligand, we accessed a range of synthetically interesting ...

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Hydroarylations of Heterobicyclic Alkenes through Rhodium‐Catalyzed Directed CH Functionalizations of S‐Aryl Sulfoximines

20.10.2014 | Wanrong Dong, Kanniyappan Parthasarathy, Ying Cheng, Fangfang Pan, Carsten Bolm, Chemistry - A European Journal, 2014

Abstract Rhodium‐catalyzed directed CH‐functionalizations have been used in hydroarylations of heterobicyclic alkenes with NH‐sulfoximines. Unexpectedly, the bicyclic framework is retained, resulting in the formation of addition products being attractive intermediates for functionalized ...

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Phosphine‐Free Stille–Migita Chemistry for the Mild and Orthogonal Modification of DNA and RNA

16.10.2014 | André Krause, Alexander Hertl, Fabian Muttach, Andres Jäschke, Chemistry - A European Journal, 2014

Abstract An optimized catalyst system of [Pd2(dba)3] and AsPh3 efficiently catalyzes the Stille reaction between a diverse set of functionalized stannanes and halogenated mono‐, di‐ and oligonucleotides. The methodology allows for the facile conjugation of short and long nucleic acid molecules ...

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Engineering Short Peptide Sequences for Uranyl Binding

16.10.2014 | Colette Lebrun, Matthieu Starck, Vicky Gathu, Yves Chenavier, Pascale Delangle, Chemistry - A European Journal, 2014

Abstract Peptides are interesting tools to rationalize uranyl–protein interactions, which are relevant to uranium toxicity in vivo. Structured cyclic peptide scaffolds were chosen as promising candidates to coordinate uranyl thanks to four amino acid side chains pre‐oriented towards the dioxo ...

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Phosphorescent Polymeric Nanoparticles by Coordination Cross‐Linking as a Platform for Luminescence Imaging and Photodynamic Therapy

16.10.2014 | Yang Lu, Fengfeng Xue, Zhiguo Zhou, Min Shi, Yuping Yan, Lijie Qin, Hong Yang, Shiping Yang, Chemistry - A European Journal, 2014

Abstract Water‐soluble phosphorescent polymeric nanoparticles with an average diameter of approximately 100 nm were synthesized by a coordination cross‐linking reaction. The pyridine blocks in poly(4‐vinyl pyridine‐b‐ethylene oxide) (P4VP‐b‐PEO) were cross‐linked by the iridium ...

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Synthesis and Biological Evaluation of a Class of Mitochondrially‐Targeted Gadolinium(III) Agents

16.10.2014 | Daniel E. Morrison, Jade B. Aitken, Martin D. de Jonge, Fatiah Issa, Hugh H. Harris, Louis M. Rendina, Chemistry - A European Journal, 2014

Abstract A structure–activity relationship study of a library of novel bifunctional GdIII complexes covalently linked to arylphosphonium cations is reported. Such complexes have been designed for potential application in binary cancer therapies such as neutron capture therapy and photon ...

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Regioisomeric Effects on the Electronic Features of Indenothiophene‐Bridged D–π‐A′–A DSSC Sensitizers

16.10.2014 | Shu‐Hua Chou, Chih‐Hung Tsai, Chung‐Chih Wu, Dhirendra Kumar, Ken‐Tsung Wong, Chemistry - A European Journal, 2014

Abstract Two D–π‐A′–A regioisomers (A‐IDT‐D and D‐IDT‐A) featuring 4,4′‐di‐p‐tolyl‐4 H‐indeno[1,2‐b]‐thiophene as a π linker (π) between the diarylamino donor (D) and the pyrimidine–cyanoacrylic acid acceptor (A′–A) have been successfully synthesized and characterized as efficient sensitizers ...

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Reactivity of Liquid Ammonia Solutions of the Zintl Phase K12Sn17 towards Mesitylcopper(I) and Phosphinegold(I) Chloride

15.10.2014 | Christian B. Benda, Markus Waibel, Tobias Köchner, Thomas F. Fässler, Chemistry - A European Journal, 2014

Abstract To gain more insight into the reactivity of intermetalloid clusters, the reactivity of the Zintl phase K12Sn17, which contains [Sn4]4− and [Sn9]4− cluster anions, was investigated. The reaction of K12Sn17 with gold(I) phosphine chloride yielded K7[(η2‐Sn4)Au(η2‐Sn4)](NH3)16 (1) and ...

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Pyranoside‐into‐Furanoside Rearrangement: New Reaction in Carbohydrate Chemistry and Its Application in Oligosaccharide Synthesis

15.10.2014 | Vadim B. Krylov, Dmitry A. Argunov, Dmitry Z. Vinnitskiy, Stella A. Verkhnyatskaya, Alexey G. Gerbst, Nadezhda E. Us ..., Chemistry - A European Journal, 2014

Abstract Great interest in natural furanoside‐containing compounds has challenged the development of preparative methods for their synthesis. Herein a novel reaction in carbohydrate chemistry, namely a pyranoside‐into‐furanoside (PIF) rearrangement permitting the transformation of selectively ...

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Lead Structures for New Antibacterials: Stereocontrolled Synthesis of a Bioactive Muraymycin Analogue

15.10.2014 | Anatol P. Spork, Martin Büschleb, Oliver Ries, Daniel Wiegmann, Stefan Boettcher, Agnes Mihalyi, Timothy D. H. Bugg, ..., Chemistry - A European Journal, 2014

Abstract Naturally occurring muraymycin nucleoside antibiotics represent a promising class of novel antibacterial agents. The structural complexity suggests the investigation of simplified analogues as potential lead structures, which can then be further optimized towards highly potent ...

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