共查询到20条相似文献,搜索用时 31 毫秒
1.
Karaked Tedsree Adam T. S. Kong Dr. Shik Chi Tsang Prof. 《Angewandte Chemie (International ed. in English)》2009,48(8):1443-1446
Formic acid adsorption on ruthenium nanoparticles of different sizes allows differentiation of differently bound formate species by solution 13C NMR spectroscopy (see picture). The chemical shifts are comparable to those of organometallic analogues, thus indicating that formate can act as a probe to distinguish surface features of metallic nanoparticles in solution with good quantification and resolution.
2.
3.
4.
5.
6.
7.
Willem‐Jan van Zeist Ruud Visser F. Matthias Bickelhaupt Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(25):6112-6115
Twisted! We show, based on DFT analyses, that the well‐known dependence of a catalyst's activity in bond activation on the ligand–metal–ligand angle, or bite angle, has a primarily steric origin, not an electronic one. Thus, by bending or twisting the catalyst a priori, one avoids unfavorable nonbonded interactions with the substrate (see figure).
8.
9.
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.
10.
11.
Long Yi Heyang Li Lu Sun Liangliang Liu Caihong Zhang Zhen Xi Prof. Dr. 《Angewandte Chemie (International ed. in English)》2009,48(22):4034-4037
Fast detection of cellular thiols in aqueous medium was achieved using a newly developed fluorescence probe (see picture). Based on this probe, a high‐throughput fluorescence assay for glutathione reductase was developed.
12.
Hazel I. A. Phillips Luca Ronconi Peter J. Sadler 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(7):1588-1596
Lighting up new platinum anticancer complexes : Photoactivation of a platinum(IV) diazido anticancer complex in the presence of a derivative of imidazole, an important constituent of biomolecules, gives surprising photoproducts, including a tetrakis imidazole platinum(II) adduct (see figure), together with free azide, dioxygen and ammonia.
13.
14.
15.
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).
16.
Benoît Blank Stefan Michlik Rhett Kempe Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(15):3790-3799
Selective amine alkylation : A P,N‐ligand‐stabilized iridium complex has been used as an efficient catalyst for the alkylation of (hetero)aromatic amines with alcohols at mild reaction temperatures and catalyst loadings as low as 0.1 mol % Ir (see scheme). The excellent selectivity of the catalyst for monoalkylation of the amine function has also been exploited for the N,N′‐dialkylation of diamines in both symmetric and nonsymmetric fashions.
17.
18.
19.
Elena López‐Torres Dr. Jonathan R. Dilworth Prof. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(12):3012-3023
Careful metal selection : Control of the reaction conditions of CuII and SnIV with Me2NNHCSNHPh permits the selective synthesis of metal complexes or a range of heterocyclic compounds generated by the oxidative coupling of two thiosemicarbazides (see figure).
20.