Cover Picture: Palladium-Catalyzed Oxidative Cross-Coupling between Heterocycles and Terminal Alkynes with Low Catalyst Loading (Angew. Chem. Int. Ed. 13/2013)

Authors

  • Dr. Xiaoming Jie,

    1. State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Yangqiao west road 155#, Fuzhou, Fujian 350002 (China)
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  • Yaping Shang,

    1. State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Yangqiao west road 155#, Fuzhou, Fujian 350002 (China)
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  • Peng Hu,

    1. State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Yangqiao west road 155#, Fuzhou, Fujian 350002 (China)
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  • Prof. Dr. Weiping Su

    Corresponding author
    1. State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Yangqiao west road 155#, Fuzhou, Fujian 350002 (China)
    • State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Yangqiao west road 155#, Fuzhou, Fujian 350002 (China)===

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Abstract

original image

The direct alkynylation of electron-rich aromatic heterocycles with terminal alkynes was accomplished in high yields and good selectivity when using a low loading of palladium catalyst, as described by W. Su and co-workers in their Communication on page 3630 ff. A high loading of palladium catalyst led to poor yields because of the undesired homocoupling of alkynes.

Cartoon 1.

The direct alkynylation of electron-rich aromatic heterocycles with terminal alkynes was accomplished in high yields and good selectivity when using a low loading of palladium catalyst, as described by W. Su and co-workers in their Communication on page 3630 ff. A high loading of palladium catalyst led to poor yields because of the undesired homocoupling of alkynes.

Dispersants for Nanotubes

Polymer-based Janus micelles provide excellent stabilization for carbon nanotubes in a variety of solvents. The “Janus balance” is critical for good stabilization properties as A. H. Gröschel, A. H. E. Müller et al. explain in their Communication on page 3602 ff.

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Artificial Nacre

An ultratough artificial nacre based on graphene oxide sheets is presented by Q. F. Cheng, M. Z. Li, Z. Y. Tang et al. in their Communication on page 3750 ff. This conductive nacre shows excellent mechanical properties and a hierarchical microstructure.

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Metal–Organic Framework

In their Communication on page 3695 ff., R. Lyndon, M. R. Hill, et al. report a metal–organic framework constructed with light-responsive linkers, which are activated upon exposure to light and release the stored carbon dioxide.

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Ancillary