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A Striking Case of Enantioinversion in Gold Catalysis and Its Probable Origins

23.07.2015 | Marina K. Ilg, Larry M. Wolf, Luca Mantilli, Christophe Farès, Walter Thiel, Alois Fürstner, Chemistry - A European Journal, 2015

Abstract The cyclization of the hydroxy‐allene 2 to the tetrahydrofuran 3 catalyzed by the gold‐phosphoramidite complex 1, after ionization with an appropriate silver salt AgX, is one of the most striking cases of enantioinversion known to date. The major reason why the sense of induction can ...


The Synthesis and Dynamic Structures of Multinuclear Complexes of Large Porphyrinoids Expanded by Phenylene and Thienylene Spacers

21.07.2015 | Jun‐ichiro Setsune, Masayuki Toda, Takafumi Yoshida, Keigo Imamura, Keigo Watanabe, Chemistry - A European Journal, 2015

Abstract 1,3‐Bis(2‐pyrryl)benzene was used to prepare dibenziamethyrin, in which two pyrrole units of [24]amethyrin( are replaced by benzene. 1,4‐Bis(2‐pyrryl)benzene, 2,5‐bis(2‐pyrryl)thiophene, and 4,4′‐bis(2‐pyrryl)biphenyl were also used in place of 2,2′‐bipyrrole to give ...


Three Series of Sulfo‐Functionalized Mixed‐Linker CAU‐10 Analogues: Sorption Properties, Proton Conductivity, and Catalytic Activity

17.07.2015 | Nele Reimer, Bart Bueken, Sebastian Leubner, Christopher Seidler, Michael Wark, Dirk De Vos, Norbert Stock, Chemistry - A European Journal, 2015

Abstract Ten mixed‐linker metal–organic frameworks [Al(OH)(m‐BDC‐X)1−y(m‐BDC‐SO3H)y] (H2BDC=1,3‐benzenedicarboxylic acid; X=H, NO2, OH) exhibiting the CAU‐10‐type structure were synthesized. The compounds can be grouped into three series according to the combination of ligands employed. The ...


Frontispiece: Fluorescent Dendritic Organogels Based on 2‐(2′‐Hydroxyphenyl)benzoxazole: Emission Enhancement and Multiple Stimuli‐Responsive Properties

17.07.2015 | Hui Chen, Yu Feng, Guo‐Jun Deng, Zhi‐Xiong Liu, Yan‐Mei He, Qing‐Hua Fan, Chemistry - A European Journal, 2015

Smart Dendritic Fluorescent Organogels A new fluorescent dendritic organogel based on a poly(benzyl ether) dendron was developed that exhibited gelation‐induced enhanced fluorescence emission properties. Most interestingly, these dendritic organogels exhibited multiple stimuli‐responsive ...


A Stable Dimer of SiS2 Arranged between Two Carbene Molecules

14.07.2015 | Chandrajeet Mohapatra, Kartik Chandra Mondal, Prinson P. Samuel, Helena Keil, Benedikt Niepötter, Regine Herbst‐Irme ..., Chemistry - A European Journal, 2015

Abstract The Me‐cAAC:‐stabilized dimer of silicon disulfide (SiS2) has been isolated in the molecular form as (Me‐cAAC:)2Si2S4 (2) at room temperature [Me‐cAAC:=cyclic alkyl(amino) carbene]. Compound 2 has been synthesized from the reaction of (Me‐cAAC:)2Si2 with elemental sulfur in a 1:4 ...


Nanoporosity, Inclusion Chemistry, and Spin Crossover in Orthogonally Interlocked Two‐Dimensional Metal–Organic Frameworks

14.07.2015 | Tania Romero‐Morcillo, Noelia De la Pinta, Lorena M. Callejo, Lucía Piñeiro‐López, M. Carmen Muñoz, Gotzon Madariaga ..., Chemistry - A European Journal, 2015

Abstract [Fe(tvp)2(NCS)2] (1) (tvp=trans‐(4,4′‐vinylenedipyridine)) consists of two independent perpendicular stacks of mutually interpenetrated two‐dimensional grids. This uncommon supramolecular conformation defines square‐sectional nanochannels (diagonal≈2.2 nm) in which inclusion molecules ...


Hydrogels Triggered by Metal Ions as Precursors of Network CuS for DNA Detection

14.07.2015 | Haiqiao Wang, Shasha Song, Jingcheng Hao, Aixin Song, Chemistry - A European Journal, 2015

Abstract The gelation behavior of lithocholate (LC−) with different metal ions in water was investigated. The microstructures of hydrogels were determined to be three‐dimensional (3D) networks of fibrous aggregates. The formation of fibrils was speculated to be mainly driven by the ...


Chiral Memory in Silylium Ions

02.07.2015 | P. Ducos, V. Liautard, F. Robert, Y. Landais, Chemistry - A European Journal, 2015

Abstract The configurational stability of the chiral silicon center in Lewis base‐stabilized silyliums has been studied. Complete retention of configuration at silicon is observed at low temperature in silylium ions stabilized by lone‐pair interactions. In contrast, loss of chiral memory is ...


Self‐Assembly of Amphiphilic Janus Dendrimers into Mechanically Robust Supramolecular Hydrogels for Sustained Drug Release

01.07.2015 | Sami Nummelin, Ville Liljeström, Eve Saarikoski, Jarmo Ropponen, Antti Nykänen, Veikko Linko, Jukka Seppälä, Jouni H ..., Chemistry - A European Journal, 2015

Abstract Compounds that can gelate aqueous solutions offer an intriguing toolbox to create functional hydrogel materials for biomedical applications. Amphiphilic Janus dendrimers with low molecular weights can readily form self‐assembled fibers at very low mass proportion (0.2 wt %) to create ...


Perfluoroalkyl and ‐aryl Zinc Ate Complexes: Generation, Reactivity, and Synthetic Application

01.07.2015 | Xuan Wang, Keiichi Hirano, Daisuke Kurauchi, Hisano Kato, Naoyuki Toriumi, Ryo Takita, Masanobu Uchiyama, Chemistry - A European Journal, 2015

Abstract A combination of dimethylzinc, perfluoroalkyl iodide, and LiCl afforded a new type of perfluoroalkyl (RF) zinc ate complex. These complexes show much greater thermal stability than conventional perfluorinated metal species, such as RF–lithium species and Grignard reagents, and they ...


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