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Liang‐Feng Yao Min Shi Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(15):3875-3881
Cascade reactions : Lewis acid catalyzed cascade reactions of 1,6‐diynes and 1,6‐enynes with arylvinylidenecyclopropanes produce polycyclic compounds and isopropylidene‐3,3‐diarylcyclobut‐1‐enylmethyl derivatives (see scheme) in good to high yields along with a PtCl2‐catalyzed cyclization and a Cu(OAc)2 ? H2O‐catalyzed Eglinton coupling reaction.
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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.
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Atsuya Muranaka Dr. Osamu Matsushita Kengo Yoshida Shigeki Mori Dr. Masaaki Suzuki Dr. Taniyuki Furuyama Masanobu Uchiyama Prof. Dr. Atsuhiro Osuka Prof. Dr. Nagao Kobayashi Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(15):3744-3751
Expanded porphyrins : The electronic excited states of two forms of meso‐hexakis(pentafluorophenyl)‐substituted gold(III) hexaphyrin(1.1.1.1.1.1), such as that depicted, have been investigated by density functional calculations and magnetic circular dichroism spectroscopy to assign their low‐energy excited singlet states.
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Guozan Yuan Chengfeng Zhu Weimin Xuan Yong Cui Prof. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(26):6428-6434
Our Schiff has come in : A homochiral porous lamellar solid based on chiral unsymmetrical Schiff base metal complexes was assembled by using coordination and hydrogen bonds (see picture). The host features a flexible helical framework and chiral amphiphilic channel surfaces capable of multiple interactions with guest species.
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Itaru Okamoto Dr. Kenji Iwamoto Yuko Watanabe Yoko Miyake Dr. Akira Ono Dr. 《Angewandte Chemie (International ed. in English)》2009,48(9):1648-1651
DNA duplexes containing 5‐modified uracil pairs (5‐bromo, 5‐fluoro, and 5‐cyanouracil) bind selectivity to metal ions. Their selectivity is sensitive to the pH value of the solution (see picture), as the acidities of the modified uracil bases vary according to the electron‐withdrawing properties of the substituents.
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State‐of‐the‐art molecular‐beam techniques reveal that the lowest lying electronic excited state in purine is the nπ* state. Using multiphoton ionization spectroscopy, the origin is found to occur at 31 309 cm?1, and a vibrational structure is visible that is assigned to the skeletal motion of the ring (see figure).
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Phased out: A combination of electrochemical and optical techniques is used to study the interaction of hydrogen with palladium nanoclusters. Hydrogen pressure‐composition isotherms reveal the reduced presence of the β phase in palladium nanoclusters. Hydrogen extraction transients relate the reduced miscibility gap to a core‐shell phase transformation in the palladium nanoclusters (see picture).
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Falk Hildebrand Stephan Lütz Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(20):4998-5001
Division of labour : The rapid enzyme inactivation in the electroenzymatic synthesis of chiral alcohols has been the main obstacle for synthetic applications during the last two decades. The reasons for this inactivation have now been elucidated. The development of a water‐soluble polymeric mediator and the spatial separation of enzyme and mediator led to the first stable process and significantly improved catalyst utilisations (see picture).
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Holger Ott Christoph Matthes Dr. Arne Ringe Dr. Jörg Magull Prof. Dr. Dietmar Stalke Prof. Dr. Uwe Klingebiel Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(18):4602-4609
Borenes and boranes : Silylaminoiminoborenes, such as depicted, were isolated after treatment of halogen triels with silylaminofluoroboranes. In addition, novel aryl‐ and silyl‐substituted diaminofluoroboranes were also prepared in order to substantiate this reaction route.
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Tetyana Beryozkina Dr. Ksenia Boyko Natalya Khanduyeva Volodymyr Senkovskyy Dr. Marta Horecha Ulrich Oertel Dr. Frank Simon Dr. Manfred Stamm Prof. Anton Kiriy Dr. 《Angewandte Chemie (International ed. in English)》2009,48(15):2695-2698
Graft work : The first surface‐initiated and site‐specific palladium‐catalyzed Suzuki polycondensation that allows selective grafting and patterning of semiconducting and emissive poly[9,9‐bis(2‐ethylhexyl)fluorene] ( 1 ) at room temperature is developed (see scheme). The pattering is demonstrated by AFM (see image).
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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.
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David Crich Prof. Dr. Indrajeet Sharma 《Angewandte Chemie (International ed. in English)》2009,48(13):2355-2358
Highly activated thioesters formed by the rapid reaction of C‐terminal thioacids derived from protected amino acids and peptides with the Sanger reagent and other electron‐deficient aryl halides in the presence of a free amine immediately form a peptide bond with the amine. This essentially epimerization‐free method was used for the 4+4 block synthesis of a hindered octapeptide (see scheme; Boc, Pbf, and Trt are protecting groups).
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Rik P. Megens Tieme A. van den Berg Dr. A. Dowine de Bruijn Ben L. Feringa Prof. Dr. Gerard Roelfes Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(7):1723-1733
Bleomycin mimics : Efficient oxidative double‐strand DNA cleavage has been achieved with multinuclear non‐heme iron complexes (see scheme). These complexes therefore represent model compounds that mimic the mode of action of the anti‐tumor drug bleomycin.