The Chemical Record

Cover image for The Chemical Record

2009

Volume 9, Issue 2

Pages 87–154

    1. Structural colored gels for tunable soft photonic crystals (pages 87–105)

      Mohammad Harun-ur-Rashid, Takahiro Seki and Yukikazu Takeoka

      Article first published online: 20 MAR 2009 | DOI: 10.1002/tcr.20169

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      Structural colored gels for the fabrication of environmentally sensitive tunable soft photonic crystals were demonstrated using closest-packed colloidal crystals as templates. This account describes the potential application of the structural colored gels for sensors and displays.

    2. Bifunctional transition metal-based molecular catalysts for asymmetric C[BOND]C and C[BOND]N bond formation (pages 106–123)

      Takao Ikariya and Ilya D. Gridnev

      Article first published online: 20 MAR 2009 | DOI: 10.1002/tcr.20172

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      New bifunctional chiral Ru and Ir catalysts effectively catalyze enantioselective Michael addition of 1,3-dicarbonyl compounds to cyclic enones and nitroalkenes, and enantioselective direct amination of α-cyanoacetates with diazoesters. Convenient synthetic procedures allow multigram scale syntheses of practically important chiral compounds. Stereoselection takes place through building a three-dimensional chiral pocket in the complex formed in the reaction of the catalyst with a pronucleophilic reagent.

    3. Flexible host frameworks with diverse cavities in inclusion crystals of bile acids and their derivatives (pages 124–135)

      Kazunori Nakano, Kazuaki Aburaya, Ichiro Hisaki, Norimitsu Tohnai and Mikiji Miyata

      Article first published online: 20 MAR 2009 | DOI: 10.1002/tcr.20171

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      Flexible host frameworks with zero-, one- and two-dimensional cavities are formed by steroidal hosts capable of including many organic compounds. The structural flexibility quantitatively estimated by size fit between the guest molecule and the host cavity, whereas shape fit and host–guest interactions in the cavities also play a decisive role in the formation of the host frameworks. Moreover, even the same guest can give different host frameworks to form polymorphs of the inclusion crystals. Control of the structural flexibility permits us to use the inclusion compounds as functional materials possessing molecular recognition and dynamic properties.

    4. Synthesizing interlocked molecules dynamically (pages 136–154)

      Philip C. Haussmann and J. Fraser Stoddart

      Article first published online: 20 MAR 2009 | DOI: 10.1002/tcr.20173

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      As the complexity of mechanically interlocked molecular architectures increases, it is important to understand the underlying principles, such as molecular recognition and self-assembly, that govern the processes of template-directed synthesis necessary to create these particular compounds. In this review, we explain the importance of dynamic processes in the synthesis of mechanically interlocked compounds. We show how many different dynamic covalent bonds have been used in the synthesis of rotaxanes, catenanes, and other higher-order mechanically interlocked compounds, with the goal of revealing the state of the art in dynamic covalent chemistry.

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