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4,842 Newest Publications in chemistry - a european journal
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Catalytic Enantioselective Ring‐Opening Reaction of meso‐Aziridines with α‐Isothiocyanato Imides
07-06-2013 | Yi‐Ming Cao, Fu‐Ting Zhang, Fang‐Fang Shen, Rui Wang, Chemistry - A European Journal, 2013
Open up your chemistry! Using cinchonine‐based trimeric quaternary ammonium salts as catalysts, meso‐aziridines can be ring opened, in an enantioselective manner, through nucleophilic addition of the sulfur atom of α‐isothiocyanato imides (see scheme; PG=protecting group). This synthetic ...
Non‐covalent Activation of a Titanium(IV) Oxygen‐Transfer Catalyst
07-06-2013 | Cristiano Zonta, Giulia Licini, Chemistry - A European Journal, 2013
Blame it on the alcohol: Kinetic studies, in combination with theoretical calculations, support a mechanism in which the coordination of one alcohol molecule activates a TiIV pre‐catalyst (see scheme). The alcohol coordination has a twofold action: it switches the TiVI peroxo complex to an ...
DFT Study of an 5‐endo‐trig‐Type Cyclization of 3‐Alkenoic Acids by Using Pd–Spiro‐bis(isoxazoline) as Catalyst: Importance of the Rigid Spiro Framework for Both Selectivity and Reactivity
07-06-2013 | Randa K. Gabr, Takuji Hatakeyama, Kazuhiro Takenaka, Shinobu Takizawa, Yoshihiro Okada, Masaharu Nakamura, Hiroaki Sasai, Chemistry - A European Journal, 2013
Abstract The reaction pathway of an enantioselective 5‐endo‐trig‐type cyclization of 3‐alkenoic acids catalyzed by a chiral palladium–spiro‐bis(isoxazoline) complex, Pd–SPRIX, has been studied by density functional theory calculations. The most plausible pathway involves intramolecular ...
Proton‐Conducting Supramolecular Metallogels from the Lowest Molecular Weight Assembler Ligand: A Quote for Simplicity
07-06-2013 | Subhadeep Saha, Eva‐Maria Schön, Carlos Cativiela, David Díaz Díaz, Rahul Banerjee, Chemistry - A European Journal, 2013
Abstract Oxalic acid has been proven to be the lowest molecular weight organic ligand able to form robust supramolecular metallogel networks in the presence of metal salts. In particular, two novel multifunctional metallogels were readily prepared at room temperature by simple mixing of ...
Class III Delocalization and Exciton Coupling in a Bimetallic Bis‐ligand Radical Complex
07-06-2013 | Tim J. Dunn, Linus Chiang, Caterina F. Ramogida, Khatera Hazin, Michael I. Webb, Michael J. Katz, Tim Storr, Chemistry - A European Journal, 2013
Abstract The geometric and electronic structure of an oxidized bimetallic Ni complex incorporating two redox‐active Schiff‐base ligands connected via a 1,2‐phenylene linker has been investigated and compared to a monomeric analogue. Information from UV/Vis/NIR spectroscopy, electron ...
Efficient Enantioselective Total Synthesis of (−)‐Horsfiline
07-06-2013 | Suckchang Hong, Myunggi Jung, Yohan Park, Min Woo Ha, Cheonhyoung Park, Myungmo Lee, Hyeung‐geun Park, Chemistry - A European Journal, 2013
Abstract A new efficient and concise enantioselective synthetic method for (−)‐horsfiline is reported. (−)‐Horsfiline could be obtained from diphenylmethyl tert‐butyl malonate in 9 steps (32 %,>99 % ee) by using the enantioselective phase‐transfer catalytic allylation (91 % ee) as the key ...
Linear Free‐Energy Correlations for the Vinylheptafulvene Ring Closure: A Probe for Hammett σ Values
06-06-2013 | Søren Lindbæk Broman, Martyn Jevric, Mogens Brøndsted Nielsen, Chemistry - A European Journal, 2013
Abstract Linear free‐energy relationships, like Hammett correlations, are fundamental in physical organic chemistry for the elucidation of reaction mechanisms. In this work, we show that Hammett correlations exist for the ring closure of six different model systems of vinylheptafulvenes ...
Mechanistic Dichotomy in the Asymmetric Allylation of Aldehydes with Allyltrichlorosilanes Catalyzed by Chiral Pyridine N‐Oxides
06-06-2013 | Andrei V. Malkov, Sigitas Stončius, Mark Bell, Fabiomassimo Castelluzzo, Pedro Ramírez‐López, Lada Biedermannová, Vr ..., Chemistry - A European Journal, 2013
Abstract Detailed kinetic and computational investigation of the enantio‐ and diastereoselective allylation of aldehydes 1 with allyltrichlorosilanes 5, employing the pyridine N‐oxides METHOX (9) and QUINOX (10) as chiral organocatalysts, indicate that the reaction can proceed through a ...
Solvatochromic Pyrene Analogues of Prodan Exhibiting Extremely High Fluorescence Quantum Yields in Apolar and Polar Solvents
06-06-2013 | Yosuke Niko, Susumu Kawauchi, Gen‐ichi Konishi, Chemistry - A European Journal, 2013
True colors: Novel pyrene analogues of Prodan exhibit outstanding photophysical properties with remarkably high fluorescence quantum yield (QY) in solvents ranging from apolar hexane to polar methanol (see figure). This is accompanied by strong solvatochromism and large Stokes shifts. ...
Nanoparticles under the Light: Click Functionalization by Photochemical Thiol‐yne Reaction, Towards Double Click Functionalization
06-06-2013 | Paul Demay‐Drouhard, Emilie Nehlig, Julie Hardouin, Laurence Motte, Erwann Guénin, Chemistry - A European Journal, 2013
A light click away: The first application of thiol‐yne reaction to nanoparticle functionalization is described (see figure). This metal‐free click chemistry approach is compatible with the addition of various molecules at the surface and can be combined with CuAAC methodology to perform ...
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