Dominik Lungerich

Multiple pentagons were synthetically embedded in cylinder-shaped molecules to obtain segments of haeckelite nanotubes with imperfect honeycomb arrays. In these cylinder-shaped molecules, conjugation was observed over the pentagon bridges. These compounds also provide intermediate structures for retrosynthetic analysis and inspiration for novel defective carbon nanotubes.

[Communication]
Shunpei Hitosugi, Sota Sato, Taisuke Matsuno, Takashi Koretsune, Ryotaro Arita, Hiroyuki Isobe
Angew. Chem. Int. Ed., June 29, 2017, https://doi.org/10.1002/anie.201704676 Read article

Good character: Cyclopenta ring fused bisanthene (middle) was facilely synthesized and shows global anti-aromaticity with moderate diradical character. The dication exhibits a unique [10]annulene-within-[18]annulene structure with an open-shell singlet ground state, while the dianion is a closed shell and displays a diatropic ring current on the π-conjugated periphery.

[Communication]
Qing Wang, Tullimilli Y. Gopalakrishna, Hoa Phan, Tun Seng Herng, Shaoqiang Dong, Jun Ding, Chunyan Chi
Angew. Chem. Int. Ed., June 29, 2017, https://doi.org/10.1002/anie.201704805 Read article

Losing O's: Graphene can be prepared by heating oxo-functionalized graphene. Defunctionalization resulting in graphene formation (path I) is the dominant process.

[Communication]
Fabian Grote, Christoph Gruber, Felix Börrnert, Ute Kaiser, Siegfried Eigler
Angew. Chem. Int. Ed., June 30, 2017, https://doi.org/10.1002/anie.201704419 Read article

Abstract

Polycycles: Depending on the auxiliary bases applied in Pd-catalyzed C−C coupling reactions electron-poor polycyclic aromatic hydrocarbons are obtained by selective five- or six-membered ring annulation.

[Communication]
Sabine Seifert, David Schmidt, Kazutaka Shoyama, Frank Würthner
Angew. Chem. Int. Ed., May 23, 2017, https://doi.org/10.1002/anie.201702889 Read article

One by one or all in one: meta-Arylated anilines are key moieties in a variety of high-value chemicals. To access these compounds, four key flow steps were identified, including synthesis of the diaryliodonium salt, meta-selective C−H arylation, and the removal of both the copper catalyst and the directing group. Each module has great individual potential, however, combining them allowed straightforward access to meta-arylated anilines within a reasonable time scale and with good purity.

[Communication]
Hannes P. L. Gemoets, Gabriele Laudadio, Kirsten Verstraete, Volker Hessel, Timothy Noël
Angew. Chem. Int. Ed., May 22, 2017, https://doi.org/10.1002/anie.201703369 Read article

A new type of twisted nanographene containing an [8]circulene moiety in a polycyclic framework of 96 sp² carbon atoms was synthesized from a macrocyclic diyne (see picture). Its structure was studied with X-ray crystallography and DFT calculations.

[Communication]
Kwan Yin Cheung, Chi Kit Chan, Zhifeng Liu, Qian Miao
Angew. Chem. Int. Ed., May 16, 2017, https://doi.org/10.1002/anie.201703754 Read article

A π-conjugated dumbbell: [5]Cumulene-bridged 2H-corrole dimers capable of accommodating Zn^II ions are synthesized from the corresponding meso-alkynyl-substituted 3H-corroles (see scheme). Their structures are revealed by X-ray diffraction analysis and the bond-length alternations in the cumulene segments are slightly larger than in conventional [n]cumulenes.

[Communication]
Kento Ueta, Koji Naoda, Shota Ooi, Takayuki Tanaka, Atsuhiro Osuka
Angew. Chem. Int. Ed., May 16, 2017, https://doi.org/10.1002/anie.201703139 Read article

Turn up the amplification: Solid-state heating of a mixture containing seven atropostereo-isomers converts almost all its components into a single product. This process takes place, even though the amplified stereoisomer represents only a minor (<25 mol %) component of the mixture at equilibrium in solution. Favorable crystal-packing interactions induce the high selectivity observed in this process.

[Communication]
Mona Sharafi, Joseph P. Campbell, Sinu C. Rajappan, Natavan Dudkina, Danielle L. Gray, Toby J. Woods, Jianing Li, Severin T. Schneebeli
Angew. Chem. Int. Ed., May 16, 2017, https://doi.org/10.1002/anie.201701876 Read article

Think big: Oxahelicenes comprising up to 19 fused rings (see example) were synthesized by multiple cobalt(I)-mediated cycloisomerization reactions of oligoynes, most efficiently in a flow reactor. The stereogenic centers in enantiomerically pure substrates steered the diastereoselective polycyclization of the oligoynes. Single-molecule conductivity was studied in a pyridooxa[9]helicene by the break-junction method.

[Communication]
Jindřich Nejedlý, Michal Šámal, Jiří Rybáček, Miroslava Tobrmanová, Florence Szydlo, Christophe Coudret, Maria Neumeier, Jaroslav Vacek, Jana Vacek Chocholoušová, Miloš Buděšínský, David Šaman, Lucie Bednárová, Ladislav Sieger, Irena G. Stará, Ivo Starý
Angew. Chem. Int. Ed., April 18, 2017, https://doi.org/10.1002/anie.201700341 Read article