共查询到20条相似文献,搜索用时 31 毫秒
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Annemarie Schäfer Dr. Wolfgang Saak Dipl.‐Chem. Detlev Haase Thomas Müller Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(16):3945-3950
Breaking the molecular symmetry by protonation of germylene 1 is the key step in the synthesis of the germyliumylidene 2 , which is stabilized by an intramolecular interaction with a distant imido group.
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Different in water! We have developed Nazarov‐type reactions in water. Different reaction courses compared with those in organic solvents are observed in water. In the presence of a scandium based, surfactant‐type catalyst, water‐trapping products are obtained exclusively. The results presented are unprecedented and provide a valuable extension to information available regarding organic reactions in water.
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Anthony J. Zucchero Rebecca A. Shiels Psaras L. McGrier M. Alicia To Christopher W. Jones Prof. Uwe H. F. Bunz Prof. 《化学:亚洲杂志》2009,4(2):262-269
Silica scaffolding : By employing functionalized mesoporous SBA‐15 silica, novel fluorescent cruciform‐silica hybrid materials are generated which preserve the desirable solution properties of cruciforms in the solid state for potential use in sensory schemes.
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Nicolas Mackiewicz Dr. Jacques A. Delaire Prof. A. William Rutherford Dr. Eric Doris Dr. Charles Mioskowski Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(15):3882-3888
Change happens : Acridine–carbon nanotube nanohybrids were built (see figure) and their photoinduced electron‐transfer properties investigated, showing variable behaviour depending on the acridine partner.
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Shigeru Arai Prof. Takashi Sato Yuka Koike Michino Hayashi Atsushi Nishida Prof. 《Angewandte Chemie (International ed. in English)》2009,48(25):4528-4531
Essential oxygen : The title transformation involves two different modes of cyanation, syn and anti cyanopalladation, as the key steps in this catalytic reaction. These processes enable successful dicyanative cyclization of diyne and enyne derivatives (see scheme).
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Yogesh Ner James G. Grote Dr. Jeffrey A. Stuart Dr. Gregory A. Sotzing Prof. 《Angewandte Chemie (International ed. in English)》2009,48(28):5134-5138
A DNA spin‐off : Electrospinning of DNA complexes gives nanofibers with a highly ordered morphology that allows homogeneous distribution of encapsulated multiple chromophores. The emission color can be controlled by suitable choice of the donor–acceptor pair and the doping ratio. Pure white‐light emission from nanofibers is demonstrated (see picture).
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Sebastian Meier Dr. Andrew J. Benie Dr. Jens Ø. Duus Prof. Ole W. Sørensen Prof. 《Chemphyschem》2009,10(6):893-895
NMR artifact purging: Modern NMR experiments depend on efficient coherence transfer pathways for their sensitivity and on suppression of undesired pathways leading to artifacts for their spectral clarity. A novel robust adiabatic element suppresses hard‐to‐get‐at artifacts (see picture).
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Guilhem Arrachart Dr. Carole Carcel Dr. Philippe Trens Prof. Jöel J. E. Moreau Prof. Michel Wong Chi Man Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(25):6279-6288
Imprinted materials : Monosilylated derivatives of melamine and cyanuric acid are used in the preparation of hybrid silica. The assembly of the melamine and cyanuric acid moieties through molecular recognition properties is the key factor in building a bridged silsesquioxane and an imprinted hybrid silica (see picture).
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Herbert Meier Prof. Dr. 《Angewandte Chemie (International ed. in English)》2009,48(22):3911-3913
En route to molecular electronics : As extended, conjugated oligomers are desirable for molecular electronics, their electrical conductance should display a low attenuation factor. Zinc‐complexed oligo(ethynyleneporphyrindiylethynylene)s have been prepared that are distinguished by ultralow attenuation factors in single‐molecule conductance.
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Xiukai Li Dr. Naoki Kikugawa Dr. Jinhua Ye Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(14):3538-3545
Slip between the sheets! The intercalation properties of lamellar solid acids have a profound impact on nitrogen doping as well as on the resultant visible‐light photocatalysis, and the effects depend strongly on the protonic acidities of the samples (see figure).
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Muriel Amatore Dr. Teresa D. Beeson Sean P. Brown David W. C. MacMillan Prof. 《Angewandte Chemie (International ed. in English)》2009,48(28):5121-5124
Time for SOme MOre : For the first time SOMO (singly occupied molecular orbital) activation has been exploited to allow a new approach to the α‐chlorination of aldehydes. This transformation can be readily implemented as part of a linchpin catalysis approach to the enantioselective production of terminal epoxides.