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518 Aktuelle Fachpublikationen zum Thema temperature

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Chiral Bora[1]ferrocenophanes: Syntheses, Mechanistic Insights, and Ring‐Opening Polymerizations

15.10.2014 | Saeid Sadeh, Hridaynath Bhattacharjee, Elaheh Khozeimeh Sarbisheh, J. Wilson Quail, Jens Müller, Chemistry - A European Journal, 2014

Abstract A series of new boron‐bridged [1]ferrocenophanes ([1]FCPs) was prepared by salt‐metathesis reactions between enantiomerically pure dilithioferrocenes and amino(dichloro)boranes (Et2NBCl2, iPr2NBCl2, or tBu(Me3Si)NBCl2). The dilithioferrocenes were prepared in situ by lithium–bromine ...

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Platinum Complexes of a Borane‐Appended Analogue of 1,1′‐Bis(diphenylphosphino)ferrocene: Flexible Borane Coordination Modes and in situ Vinylborane Formation

15.10.2014 | Bradley E. Cowie, David J. H. Emslie, Chemistry - A European Journal, 2014

Abstract A bis(phosphine)borane ambiphilic ligand, [Fe(η5‐C5H4PPh2)(η5‐C5H4PtBu{C6H4(BPh2)‐ortho})] (FcPPB), in which the borane occupies a terminal position, was prepared. Reaction of FcPPB with tris(norbornene)platinum(0) provided [Pt(FcPPB)] (1) in which the arylborane is η3BCC‐coordinated. ...

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Tautomerism and Atropisomerism in Free‐Base (meso)‐Strapped Porphyrins: Static and Dynamic Aspects

15.10.2014 | Maxence Urbani, Tomás Torres, Chemistry - A European Journal, 2014

Abstract We report herein some outstanding examples of atropisomerism and tautomerism in five (meso‐)strapped porphyrins. Porphyrins S0–S4 have been synthesised, characterised and studied in detail by spectroscopic and spectrometric techniques, and their isomeric purity verified by HPLC ...

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A Facile Asymmetric Approach to the Multicyclic Core Structure of Mangicol A

10.10.2014 | Jun Ying, Lin Pu, Chemistry - A European Journal, 2014

Abstract Chiral propargylic ether‐based triene–ynes are synthesized with high enantiomeric purity by employing an asymmetric enyne addition to aldehydes catalyzed by 1,1′‐bi‐2‐naphthol in combination with ZnEt2, Ti(OiPr)4 and dicyclohexylamine at room temperature. These substrates are found to ...

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[(IPent)PdCl2(morpholine)]: A Readily Activated Precatalyst for Room‐Temperature, Additive‐Free Carbon–Sulfur Coupling

10.10.2014 | Jennifer L. Farmer, Matthew Pompeo, Alan J. Lough, Michael G. Organ, Chemistry - A European Journal, 2014

Abstract A series of new, easily activated NHC–PdII precatalysts featuring a trans‐oriented morpholine ligand were prepared and evaluated for activity in carbon‐sulfur cross‐coupling chemistry. [(IPent)PdCl2(morpholine)] (IPent=1,3‐bis(2,6‐di(3‐pentyl)phenyl)imidazol‐2‐ylidene) was identified ...

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Scanning SQUID Microscopy of Local Superconductivity in Inhomogeneous Combinatorial Ceramics

10.10.2014 | Mitra Iranmanesh, Manuela Stir, John R. Kirtley, Jürg Hulliger, Chemistry - A European Journal, 2014

Abstract Although combinatorial solid‐state chemistry promises to be an efficient way to search for new superconducting compounds, the problem of determining which compositions are strongly diamagnetic in a mixed‐phase sample is challenging. By means of reactions in a system of randomly mixed ...

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A Copper–Formate Framework Showing a Simple to Helical Antiferroelectric Transition with Prominent Dielectric Anomalies and Anisotropic Thermal Expansion, and Antiferromagnetism

09.10.2014 | Ran Shang, Sa Chen, Zhe‐Ming Wang, Song Gao, Chemistry - A European Journal, 2014

Abstract We present here the compound [NH4][Cu(HCOO)3], a new member of the [NH4][M(HCOO)3] family. The Jahn–Teller Cu2+ ion leads to a distorted 49⋅66 chiral Cu–formate framework. In the low‐temperature (LT) orthorhombic phase, the Cu2+ is in an elongated octahedron, and the ions in the ...

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Coordination‐Driven Macrocyclization for Locking of Photo‐ and Thermal cis→trans Isomerization of Azobenzene

08.10.2014 | Masaki Yamamura , Koji Yamakawa, Yuki Okazaki, Tatsuya Nabeshima , Chemistry - A European Journal, 2014

Abstract Both trans and cis isomers of azobenzene‐linked bis‐terpyridine ligand L1 were incorporated in rigid macrocycles linked by FeII(tpy)2 (tpy: terpyridine) units. The complex of the longer trans‐L1 is dinuclear [(trans‐L1)2⋅FeII2], whereas the complex of the shorter cis‐L1 is mononuclear ...

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Sb‐Triggered β‐to‐α Transition: Solvothermal Synthesis of Metastable α‐Cu2Se

08.10.2014 | Feng Jia, Shu Zhang, Xiaokun Zhang, Xiaoli Peng, Haitao Zhang, Yong Xiang, Chemistry - A European Journal, 2014

Abstract Control over phase stabilities during synthesis processes is of great importance for both fundamental studies and practical applications. We describe herein a facile strategy for the synthesis of Cu2Se with phase selectivity through a simple solvothermal method. In the presence and ...

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Epimerization of Glycal Derivatives by a Cyclopentadienylruthenium Catalyst: Application to Metalloenzymatic DYKAT

18.09.2014 | Richard Lihammar, Jerk Rönnols, Göran Widmalm, Jan‐E. Bäckvall, Chemistry - A European Journal, 2014

Abstract Epimerization of a non‐anomeric stereogenic center in carbohydrates is an important transformation in the synthesis of natural products. In this study an epimerization procedure of the allylic alcohols of glycals by cyclopentadienylruthenium catalyst 1 is presented. The epimerization ...

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