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The solution‐phase synthesis is one of the most promising strategies for the preparation of well‐defined graphene nanoribbons (GNRs) in large scale. To prepare high quality, defect‐free GNRs, cycloaromatization reactions need to be very efficient, proceed without side reaction and mild enough to accommodate the presence of various functional groups. In this Minireview, we present the latest synthetic approaches for the synthesis of GNRs and related structures, including alkyne benzannulation, photochemical cyclodehydrohalogenation, Mallory and Pd‐ and Ni‐catalyzed reactions. [ABSTRACT FROM AUTHOR]

Abstract: Narrow thiophene‐edged graphene nanoribbons (GNRs) were prepared from polychlorinated thiophene‐containing poly(p‐phenylene)s using the photochemical, metal‐free cyclodehydrochlorination (CDHC) reaction. 1H NMR and Raman spectroscopy confirmed the structures of the GNRs. The regioselectivity of the CDHC reaction allows the preparation of both laterally symmetrical and unsymmetrical GNRs and, consequently, the modulation of their optical and electronic properties. [ABSTRACT FROM AUTHOR]

Graphene is a zero-gap, semiconducting 2D material that exhibits outstanding charge-transport properties. One way to open a band gap and make graphene useful as a semiconducting material is to confine the electron delocalization in one dimension through the preparation of graphene nanoribbons (GNR). Although several methods have been reported so far, solution-phase, bottom-up synthesis is the most promising in terms of structural precision and large-scale production. Herein, we report the synthesis of a well-defined, helically coiled GNR from a polychlorinated poly( m-phenylene) through a regioselective photochemical cyclodehydrochlorination (CDHC) reaction. The structure of the helical GNR was confirmed by 1H NMR, FT-IR, XPS, TEM, and Raman spectroscopy. This Riemann surface-like GNR has a band gap of 2.15 eV and is highly emissive in the visible region, both in solution and the solid state. [ABSTRACT FROM AUTHOR]

Novel nanographenes were prepared by a photochemical cyclodehydrochlorination (CDHC) reaction. Chlorinated precursors were irradiated in acetone in the presence of a base or in pure benzene and underwent multiple (up to four) regioselective cyclization reactions to provide rigid π-conjugated molecules. Pure compounds were recovered in good yields by simple filtration at the end of the reaction. The CDHC reaction showed compatibility with both electron-poor and electron-rich substrates, thus allowing the synthesis of pyridine- and thiophene-fused nanographenes. It also enabled the synthesis of sterically hindered contorted π-conjugated molecules without causing full aromatization. A kinetic study showed that the CDHC reaction under the conditions used is a very fast process, and some reactions are completed within minutes. The CDHC reaction thus shows great potential as an alternative to other reactions involving harsher conditions for the preparation of nanographenes. [ABSTRACT FROM AUTHOR]

Nanobänder aus Helicen ‐ artigem Graphen (HGNRs) wurden durch regioselektive photochemische Cyclodehydrochlorierung eines polychlorierten Polyphenylens synthetisiert. In ihrer Zuschrift auf S. 6309 zeigen J. ‐ F. Morin et al., dass die HGNRs stark leuchten und im Vergleich zu anderen GNRs eine große Bandlücke aufweisen. Solche definierten helikalen GNR ‐ Strukturen bergen zahlreiche Anwendungsmöglichkeiten in der Wirt ‐ Gast ‐ Chemie, der molekularen Elektronik und in Sensoren. [ABSTRACT FROM AUTHOR]