Angewandte Chemie International Edition

Cover image for Vol. 54 Issue 21

Editor: Peter Gölitz, Deputy Editors: Neville Compton, Haymo Ross

Online ISSN: 1521-3773

Associated Title(s): Angewandte Chemie, Chemistry - A European Journal, Chemistry – An Asian Journal, ChemistryOpen, ChemPlusChem, Zeitschrift für Chemie

54_22/2015Cover Picture: In Situ Generation of Difluoromethyl Diazomethane for [3+2] Cycloadditions with Alkynes (Angew. Chem. Int. Ed. 22/2015)

The elusive reagent difluoromethyl diazomethane (CF2HCHN2) was generated in situ for the first time and employed in [3+2] cycloaddition reactions with alkynes. In his Communication on page 6558 ff., P. Mykhailiuk describes that this one-pot process for the synthesis of difluoromethylated pyrazoles is very practical as it does not require a catalyst or the isolation of the potentially toxic and explosive gaseous intermediate and can be easily scaled up.

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Also of Interest

The elusive reagent difluoromethyl diazomethane (CF2HCHN2) was generated in situ for the first time and employed in [3+2] cycloaddition reactions with alkynes. In his Communication on page 6558 ff., P. Mykhailiuk describes that this one-pot process for the synthesis of difluoromethylated pyrazoles is very practical as it does not require a catalyst or the isolation of the potentially toxic and explosive gaseous intermediate and can be easily scaled up.

Fluorescent Probesfor001

A photoactivatable organelle-specific live-cell imaging probe that is based on a 6π electrocyclization/oxidation mechanism is described by D. M. Chenoweth and M. N. Tran in their Communication on page 6442 ff.


Controlling Pore Sizefor002

A new method allows porous carbon fibers to be prepared without inorganic templates. In their Communication on page 6466 ff., T. Ogoshi et al. show the pore dimensions can be controlled at the Ångstrom level.


Clear Coatingsfor003

A graft-copolymer-based approach, described by M. Rabnawaz and G. Liu in their Communication on page 6516 ff., leads to clear polyurethane coatings that can protect surfaces from stains, fingerprints, and graffiti.


54_22i/2015Inside Cover: Cumulene Rotaxanes: Stabilization and Study of [9]Cumulenes (Angew. Chem. Int. Ed. 22/2015)

[n]Cumulenes are difficult to characterize owing to their reactivity. In their Communication on page 6645 ff., R. R. Tykwinski and co-workers present an approach for the stabilization of [n]cumulenes based on locking the cumulene within a rotaxane. The rotaxane acts as a “life saver” to provide molecules sufficiently stable for solution- and solid-state studies. The result is stable cumulene rotaxanes that enable the study of properties as a function of cumulene length in unprecedented detail.

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54_22c/2015Inside Back Cover: Porous Carbon Fibers Containing Pores with Sizes Controlled at the Ångstrom Level by the Cavity Size of Pillar[6]arene (Angew. Chem. Int. Ed. 22/2015)

Controlling pore size at the Ångstrom level is very difficult, and requires inorganic templates that have to be removed. In their Communication on page 6466 ff., T. Ogoshi and co-workers introduce a new method to synthesize porous carbon fibers without inorganic templates. Carbonization of the fibrous 2D porous sheets formed from hexagonal pillar[6]arenes gives porous carbon fibers with pores of a size precisely controlled at the Ångstrom level.

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54_22b/2015Back Cover: Graft-Copolymer-Based Approach to Clear, Durable, and Anti-Smudge Polyurethane Coatings (Angew. Chem. Int. Ed. 22/2015)

Clear anti-smudge coatings have been prepared by incorporating liquid poly(hexafluoroisopropylene oxide) into a polyurethane formulation. In their Communication on page 6516 ff., M. Rabnawaz and G. Liu show that these coating can be applied to different surfaces, including glass and steel. The coatings repel water, hexadecane, ink, paints, and an artificial fingerprint liquid, and thus have the potential to provide protection against stains, graffiti, and fingerprints.

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