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Bao‐Hua Zhu Dr. Yusuke Shibata Satoshi Muratsugu Yoshinori Yamanoi Dr. Hiroshi Nishihara Prof. 《Angewandte Chemie (International ed. in English)》2009,48(21):3858-3861
Two dragons playing ball : Direct metal–metal bond formation using a π‐conjugated dinuclear metalladithiolene complex with two electron‐deficient metal centers as building blocks led to a cyclic double trinuclear heterometalladithiolene cluster with two parallel plane bridges (see structure; Rh pink, Mo green, S yellow, C gray, O red).
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Andreas Lohr Dr. Matthias Grüne Dr. Frank Würthner Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(15):3691-3705
Dipolar aggregation : Examples of a novel class of tweezer molecules have been constructed through the tethering of two dipolar merocyanine chromophores. The electrostatic‐interaction‐directed self‐assembly of these tweezers affords centrosymmetric bimolecular complexes with a unique aggregate geometry of four π‐stacked chromophores (see picture) with an alternating arrangement of their dipole moments and very high dimerization constants, even in the good solvating solvent chloroform.
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Liana M. Klivansky Gayane Koshkakaryan Dennis Cao Yi Liu Dr. 《Angewandte Chemie (International ed. in English)》2009,48(23):4185-4189
Cage me! A linear dumbbell‐shaped bipyridinium molecule can template cage formation around itself through sixfold imine bond formation to give an interlocked [2]rotaxane as the single product (see picture). This highly efficient [2+3] clipping occurs despite the symmetry mismatch between the template and the formed macrobicycle.
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Paolo Melchiorre Dr. 《Angewandte Chemie (International ed. in English)》2009,48(8):1360-1363
Following the light: Photoredox catalysis along with aminocatalysis have proved to be the right combination for one of the most challenging asymmetric transformation in organic synthesis: the direct intermolecular α‐alkylation of aldehydes.
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Hiromitsu Maeda Prof. Dr. Yoshihiro Ito Yohei Haketa Nazuki Eifuku Eunji Lee Myongsoo Lee Prof. Dr. Takeshi Hashishin Dr. Kenji Kaneko Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(15):3706-3719
Just subtract water : Amphiphilic π‐conjugated acyclic oligopyrroles form solvent‐assisted H‐aggregates that give rise to vesicular structures in aqueous solution (see figure). The H‐aggregates are sensitive to the conditions and are transformed into J‐aggregates by the removal of water.
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Natalya Hessenauer‐Ilicheva Alicja Franke Dr. Dominik Meyer Wolf‐D. Woggon Prof. Dr. Rudi van Eldik Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(12):2941-2959
Two new models for cytochrome P450 in which the thiolate axial ligand is replaced by an RSO3? group, form oxo‐iron(IV) porphyrin π‐cation radicals as sole oxidation products in “peroxo shunt” reactions (see scheme) independent of the nature of the employed solvent (polar or non‐polar) and electronic nature of the porphyrin rings.
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Omrane Fadhel Dr. Dénes Szieberth Dr. Valérie Deborde Christophe Lescop Dr. László Nyulászi Prof. Muriel Hissler Prof. Régis Réau Prof. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(19):4914-4924
PS, I love you! Novel mixed phosphole/thiophene π‐conjugated systems were synthesized and their electronic properties have been studied both experimentally by UV/Vis spectroscopy and electrochemistry and by theoretical calculations. Exploiting the chemistry of both P‐ and S‐heteroles allows the generation of a diverse range of novel ring‐fused benzophosphole–thiophene derivatives.
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Romas Kudirka Sean K. J. Devine Christopher S. Adams David L. Van Vranken Prof. 《Angewandte Chemie (International ed. in English)》2009,48(20):3677-3680
As easy as 1, 2, 3 : A palladium‐catalyzed three‐component coupling generates α,β‐unsaturated γ‐amino acids in a single step (see scheme). The reaction is believed to involve migration of a vinyl substituent to a highly electrophilic palladium carbene. Unlike previous synthetic approaches, this synthesis provides access to γ‐amino acids with non‐natural side chains.
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Andrew R. Shaffer Joseph A. R. Schmidt Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(11):2662-2673
Phorteen phine phosphines : Fourteen new α,β‐unsaturated β‐chloroimines were synthesized from inexpensive ketones by using the Vilsmeier–Haack reagent followed by Schiff‐base condensation. Each imine was subsequently converted to an α,β‐unsaturated 3‐iminophosphine through either late‐metal‐catalyzed phosphorus–carbon cross‐coupling or through an addition–elimination sequence (see scheme). This high‐yield protocol serves as a general means to produce α,β‐unsaturated 3‐iminophosphines.
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Anthony Yiu‐Yan Tam Keith Man‐Chung Wong Dr. Vivian Wing‐Wah Yam Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(19):4775-4778
Helical superstructures : A series of luminescent chiral alkynylplatinum(II)–terpyridyl complexes has been successfully synthesised and shown to be capable of forming metallogels that show helical fibrous nanostructures. The chiral supramolecular structure and the spectroscopic properties are found to depend on the extent of aggregation through Pt???Pt and π–π interactions in various counteranions, as revealed by UV/Vis, circular dichroism (CD), and luminescence studies (see picture).
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Yong‐beom Lim Dr. Kyung‐Soo Moon Myongsoo Lee Prof. 《Angewandte Chemie (International ed. in English)》2009,48(9):1601-1605
Protein roll call : Peptide‐based building blocks, in which both an α‐helix‐forming segment and a β‐sheet segment are located within a single macrocyclic structure, self‐assemble into α‐helix‐decorated artificial proteins. This approach provides a starting point for developing artificial proteins that can modulate α‐helix‐mediated interactions occurring in a multivalent fashion.
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Andrew J. Hallett Dr. Gerard J. Kwant Dr. Johannes G. de Vries Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(9):2111-2120
Resolution through revolution : It is possible to extract 3,5‐dinitrobenzoyl‐protected amino acids enantioselectively with the aid of a table‐top centrifugal contact separator and a catalytic amount of a chiral host compound based on the Cinchona alkaloids. Enantioselectivities of up to 80 % could be reached in a single pass. This allows the development of a process for the continuous separation of racemates.
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Daryl A. Guthrie John D. Tovar Prof. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(21):5176-5185
No protection? A unique, albeit fairly specialized, example of what promises to be a useful retrosynthetic consideration for those designing complex π‐molecular systems, namely, using conformation as a protecting group to shield a given reactive site in lieu of protecting‐group manipulation, is described (see scheme).
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Xue‐Yi Chen Charles Barnes Dr. Jerry R. Dias Prof. T. C. Sandreczki Prof. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(9):2041-2044
Triethylamine hydroiodide crystals were formed during Sonogashira reactions; after complete reaction the solution retains a characteristic light color (see picture). Very sluggish Sonogashira reactions of electron‐enriched aryl diiodides have been carried out in high yield in an oxygen‐free, two‐chamber reaction system. The formation of triethylamine hydroiodide crystals was monitored to determine the completion of reaction.