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Kirill Nikitin Dr. Helge Müller‐Bunz Dr. Yannick Ortin Dr. Michael J. McGlinchey Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(8):1836-1843
Metal clamping in operation! Deprotonation of [η6‐2‐(9‐triptycyl)indene]tricarbonylchromium induces a haptotropic shift of the organometallic fragment from the six‐membered to the five‐membered ring, as in a→b . In the anion, rotation of the molecular paddlewheel is blocked by the bulky tripod. X‐ray crystal structures provide pictures of the system in both its “ON” and “OFF” states.
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Philipp Selig Dr. Eberhardt Herdtweck Dr. Thorsten Bach Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(14):3509-3525
The stereogenic centers at C3 and C12 of meloscine ( 3 ) can be established in the photochemical key step 1 → 2 . 1,2‐retro‐Benzilic acid rearrangement to a five‐membered ring, reductive amination, Claisen rearrangement, and ring‐closing metathesis are further key steps in the transformation of cyclobutane 2 into the target molecule 3 (14 steps, 9 % overall yield). Enantioselective access to (+)‐meloscine was possible when the [2+2]‐photocycloaddition was conducted in the presence of a chiral template.
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Jorge Bordello Belén Reija Dr. Wajih Al‐Soufi Prof. Dr. Mercedes Novo Prof. Dr. 《Chemphyschem》2009,10(6):931-939
Buckle up! The dimerization of small fluorescent guests is strongly enhanced in presence of a cyclodextrin host. The host cavity acts like a belt to assist the self‐assembly of guests (see picture). Small variations in the guest structure have significant influence on the stability and geometry of the aggregates.
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Valeria Castelletto Dr. Ian W. Hamley Prof. Rohan A. Hule Dr. Darrin Pochan Prof. 《Angewandte Chemie (International ed. in English)》2009,48(13):2317-2320
An addition to the family : The introduction of β‐amino acid residues into a modified amyloid β peptide fragment resulted in well‐defined helical nanoribbons (see cryo‐TEM image) comprising β strands mainly oriented perpendicular to the ribbon axis. The nanoribbons order into a flow‐aligning nematic phase at higher concentration. The β‐strand nanoribbon structure is an addition to the known set of secondary structures adopted by β‐peptides.
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Hai‐Hua Lu Hui Liu Dr. Wei Wu Xu‐Fan Wang Liang‐Qiu Lu Wen‐Jing Xiao Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(12):2742-2746
Economical approach : The first organocatalytic asymmetric intramolecular hydroarylation of phenol‐ and aniline‐derived enals offers one of the most straightforward and atom‐economic approaches to enantioriched chromans and tetrahydroquinolines (up to 96 % ee; see scheme).
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Benito Alcaide Prof. Dr. Pedro Almendros Dr. Teresa Martínez del Campo Dipl.‐Chem. M. Teresa Quirós Dipl.‐Chem. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(14):3344-3346
First insights into the reaction between a Baylis–Hillman adduct and an allene moiety have been obtained from the novel domino heterocyclization/cross‐coupling reaction of α‐allenols and Baylis–Hillman acetates, which furnishes [(2,5‐dihydrofuran‐3‐yl)methyl]acrylate derivatives in moderate to good yields.
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Pierre Garcia Solenne Moulin Yves Miclo Dr. David Leboeuf Vincent Gandon Dr. Corinne Aubert Dr. Max Malacria Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(9):2129-2139
Three‐ring circus : An expedient route to tricyclic fused 2‐trimethylsilyl‐3‐aminopyridines exhibiting unprecedented skeletons is described. The key step is a very efficient cobalt‐catalyzed [2+2+2] cycloaddition of a polyunsaturated compound displaying an ynamide, an alkyne, and a nitrile functionality (see picture).
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Huanhuan Liang Hao Chen Dr. Keqiang Fan Dr. Ping Wei Dr. Xianrong Guo Dr. Changwen Jin Prof. Chen Zeng Prof. Chao Tang Prof. Luhua Lai Prof. 《Angewandte Chemie (International ed. in English)》2009,48(18):3301-3303
A designer monomeric protein with a βαβ fold—two parallel β strands connected by an α helix (see structure)—was constructed solely from coded amino acids. The high thermal stability of the structure is due to a large extent to tryptophan–tryptophan interactions between the two β strands.
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Atsuro Takai Claude P. Gros Dr. Jean‐Michel Barbe Dr. Roger Guilard Prof. Dr. Shunichi Fukuzumi Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(13):3110-3122
π–π assisted : Photoinduced electron transfer from cofacial porphyrin dimers to electron acceptors is prominently accelerated, whereas the back electron transfer is decelerated, relative to the corresponding porphyrin monomer (see figure).
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Taichi Ikeda Dr. Masayoshi Higuchi Dr. Dirk G. Kurth Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(19):4906-4913
Towards polythiophene polyrotaxanes : The β‐substituted terthiophene [2]rotaxanes have been synthesized (see figure). Basic optical and electrochemical properties of the synthesized [2]rotaxanes are also reported.
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Jia Meng Dr. Yu‐Long Zhao Prof. Chuan‐Qing Ren Dr. You Li Dr. Zhu Li Dr. Qun Liu Prof. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(8):1830-1834
Single step : Fused bicyclic and bridged tricyclic ketals were synthesized in a single step from the reactions of easily available 4‐acyl‐1,6‐diynes with H2O and alkanols (see scheme). The highly efficient AuCl3‐catalyzed multicomponent domino reactions, involving five C ? O bond formations, can proceed in a highly regio‐ and diastereoselective manner at room temperature under air and lead to structures of high molecular complexity from simple starting materials in an atom economic way.
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Synthesis of 2‐(Selenophen‐2‐yl)pyrroles and Their Electropolymerization to Electrochromic Nanofilms
Boris A. Trofimov Prof. Dr. Elena Yu. Schmidt Dr. Albina I. Mikhaleva Prof. Dr. Cristina Pozo‐Gonzalo Jose A. Pomposo Maitane Salsamendi Nadezhda I. Protzuk Dr. Nadezhda V. Zorina Dr. Andrey V. Afonin Dr. Alexander V. Vashchenko Dr. Ekaterina P. Levanova Dr. Galina G. Levkovskaya Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(26):6435-6445
Bridging pyrrole and selenophene chemistries : Molecular assemblies have been developed that allow scrutiny of the electronic communication between pyrrole and selenophene nuclei. Divergent syntheses of 2‐(selenophen‐2‐yl)pyrroles and their N‐vinyl derivatives from available 2‐acylselenophenes and acetylenes in a one‐pot procedure have been devised (see scheme), which provide access to these exotic heterocyclic ensembles.