共查询到20条相似文献,搜索用时 31 毫秒
1.
2.
Bringing order : A new class of periodic mesoporous organosilicas (PMOs) with a urea‐bridged organosilica precursor under acid‐catalyzed and inorganic‐salt‐assisted conditions was obtained. The large‐pore hybrid materials have ordered mesostructure with uniform pore size distributions, which can be seen from the TEM images.
3.
Jianhui Zhu Yongmei Zhao Dr. Yanyan Zhu Ziyi Wu Miaoxin Lin Weijiang He Dr. Yan Wang Dr. Guangju Chen Prof. Dr. Lei Dong Dr. Junfeng Zhang Prof. Dr. Yi Lu Prof. Dr. Zijian Guo Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(21):5245-5253
The center of it all : An antitumor‐active trinuclear platinum complex forms unprecedented interstrand cross‐linked triadducts with 18‐mer DNA duplexes (see figure; complex in yellow with the platinum centers in red) and behaves differently from its dinuclear analogue.
4.
5.
Manuel Ojeda Dr. Enrique Iglesia Prof. 《Angewandte Chemie (International ed. in English)》2009,48(26):4800-4803
Selective HCOOH decomposition to H 2 /CO 2 on Au : Au species catalyze HCOOH dehydrogenation at higher rates than on Pt, previously considered the most active metal. Dehydrogenation occurs through formate decomposition limited by H2 desorption on Au species undetectable by TEM. CO did not form (<10 ppm), making products suitable for low‐temperature fuel cells.
6.
Pier Giorgio Cozzi Prof. Dr. Fides Benfatti Dr. Luca Zoli Dr. 《Angewandte Chemie (International ed. in English)》2009,48(7):1313-1316
Work‐alcoholic! The elusive enantioselective catalytic α‐alkylation of aldehydes, a widely sought transformation, was brought to execution by the use of alcohols capable of forming stabilized carbocations (see scheme, TFA=trifluoroacetic acid).
7.
8.
Qingwei Meng Dr. Xiao‐Hua Sun Dr. Zhengyu Lu Ping‐Fang Xia Zehua Shi Dongzhong Chen Prof. Dr. Man Shing Wong Prof. Dr. Salem Wakim Dr. Jianping Lu Dr. Jean‐Marc Baribeau Dr. Ye Tao Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(14):3474-3487
Supramolecular chirality and liquid crystalline OFET : Achiral end‐capped oligothiophenes can be tuned to exhibit supramolecular chirality with unique striped textures showing distinct circular dichroism signals as well as a highly ordered SmE phase that leads to high hole carrier mobility.
9.
10.
11.
12.
Jung Hee Yoon Dae Won Ryu Hyoung Chan Kim Dr. Sung Won Yoon Byoung Jin Suh Prof. Chang Seop Hong Prof. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(15):3661-3665
Two‐step magnetic transitions : An azide‐bridged 1D MnIII coordination polymer with a unique single end‐on mode was prepared; it displayed atypical antiferromagnetic couplings and field‐induced two‐step magnetic transitions (see figure). The spin‐canted phenomenon in the antiferromagnetic chain complex plays a pivotal role in establishing the slow magnetic relaxation.
13.
Fruity electrodes : A simple bottom‐up self‐assembly method was used to fabricate rambutan‐like tin–carbon (Sn@C) nanoarchitecture (see scheme, green Sn) to improve the reversible storage of lithium in tin. The mechanism of the growth of the pear‐like hairs is explored.
14.
Haifeng Yu Dr. Zhengkun Yu Prof. Dr. 《Angewandte Chemie (International ed. in English)》2009,48(16):2929-2933
Let's make 'meri' : Metal‐free direct alkenylation of indoles was realized by acid‐mediated substitution reactions of α‐oxo ketene dithioacetals with indoles in trifluoroacetic acid/dichloromethane, selectively affording β‐indolyl mono‐ and disubstituted α,β‐unsaturated carbonyl compounds (see scheme). Condensation of the indolyl/ketene monothioacetals and guanidine nitrate efficiently produced meridianin derivatives.
15.
Hak‐Suk Sim Xinhui Feng Jaesook Yun Prof. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(8):1939-1943
Josi or Mandy? Asymmetric conjugate addition of diboron to acyclic enones catalyzed by copper affords chiral organoboronates that possess a boronate group at the β stereocenter with excellent chemical yields and enantioselectivities (see scheme). This method accommodates the structural variation of acyclic enones and provides access to highly functionalized chiral organoboronates in one step.
16.
Na Na Yu Xia Zhenli Zhu Xinrong Zhang Prof. R. Graham Cooks Prof. 《Angewandte Chemie (International ed. in English)》2009,48(11):2017-2019
Selective and specific dihydrogenation of benzene and other arenes has been observed in a low‐temperature helium plasma. A surface Birch reduction mechanism has been proposed in which benzene molecules adsorbed on the discharge surface capture low‐energy surface‐adsorbed electrons and subsequently undergo protonation (see picture). Gas‐phase oxidation processes accompany the reduction reaction.
17.
Rosa E. Estévez José Justicia Dr. Btissam Bazdi Noelia Fuentes Miguel Paradas Duane Choquesillo‐Lazarte Dr. Juan M. García‐Ruiz Prof. Rafael Robles Dr. Andreas Gansäuer Prof. Juan M. Cuerva Dr. J. Enrique Oltra Prof. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(12):2774-2791
Versatility of titanium : Titanocene(III) complexes catalyze Barbier‐type allylations, intramolecular crotylations (cyclizations), and prenylations of a wide range of aldehydes and ketones. These reactions take place at RT under mild conditions compatible with many functional groups; provide good yields of open‐chain and cyclic homoallylic alcohols, including heterocyclic derivatives; and can be conducted enantioselectively by using enantiomerically pure titanium catalysts.
18.
Fabien Mançois Jean‐Luc Pozzo Prof. Jianfeng Pan Dr. Frédéric Adamietz Vincent Rodriguez Prof. Laurent Ducasse Dr. Frédéric Castet Dr. Aurélie Plaquet Benoît Champagne Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(11):2560-2571
Molecular switches : Highly efficient acido‐ and photoswitchable frequency doublers (see scheme) based on the indolinooxazolidine core are studied by means of hyper‐Rayleigh experiments and quantum‐chemical calculations.
19.
José Luis García Ruano Prof. Dr. Vanesa Marcos José Alemán Dr. 《Angewandte Chemie (International ed. in English)》2009,48(17):3155-3157
No hurdle is too high : The regioselectivity and stereoselectivity of the halohydroxylation of non‐activated allenes are controlled by a remote sulfinyl group through anchimeric assistance (see scheme). The resulting halohydrines are excellent chiral targets for the preparation of optically pure propargylic alcohols and Baylis–Hillman‐type products.
20.
Shengbin Lei Dr. An Ver Heyen Dr. Steven De Feyter Prof. Dr. Mathieu Surin Dr. Roberto Lazzaroni Prof. Dr. Sabine Rosenfeldt Dr. Matthias Ballauff Prof. Dr. Peter Lindner Dr. Dennis Mössinger Sigurd Höger Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(11):2518-2535
Round and round : Covalently bound spokes induce an efficient template‐directed cyclization towards a rigid molecular wheel (see figure) and afford dramatically increased shape‐persistence properties compared with non‐strutted macrocycles.