@article{142e36abcc7d4a68a0a7bc6839f1b60d,
title = "Rhodium-Catalyzed Synthesis, Crystal Structures, and Photophysical Properties of [6]Cycloparaphenylene Tetracarboxylates",
abstract = "The synthesis of C2-symmetrical [6]cycloparaphenylene (CPP) tetracarboxylates has been achieved via macrocyclization by the rhodium-catalyzed intermolecular stepwise cross-alkyne cyclotrimerization and subsequent reductive aromatization. The 1H NMR spectra of the thus-obtained C2-symmetrical [6]CPP-tetracarboxylates revealed that the rotation of unsubstituted benzene rings is slow at room temperature. These [6]CPPs formed columnar packing structures, and their absorption maxima were significantly blue-shifted compared to that of nonsubstituted [6]CPP due to the presence of four electron-withdrawing ester moieties.",
author = "Norihiko Hayase and Haruki Sugiyama and Hidehiro Uekusa and Yu Shibata and Ken Tanaka",
note = "Funding Information: This research was supported in part by a Grant-in-Aid for Scientific Research on Innovative Areas “π-System Figuration: Control of Electron and Structural Dynamism for Innovative Functions” (No. JP26102004) from the Japan Society for the Promotion of Science (JSPS, Japan) and ACT-C (No. JPMJCR1122YR) from the Japan Science and Technology Agency (JST, Japan). We thank Takasago International Corp. for the gift of H8−BINAP and Umicore for generous support in supplying the rhodium complex. Funding Information: This research was supported in part by a Grant-in-Aid for Scientific Research on Innovative Areas {"}?-System Figuration: Control of Electron and Structural Dynamism for Innovative Functions{"} (No. JP26102004) from the Japan Society for the Promotion of Science (JSPS, Japan) and ACT-C (No. JPMJCR1122YR) from the Japan Science and Technology Agency (JST, Japan). We thank Takasago International Corp. for the gift of H8-BINAP and Umicore for generous support in supplying the rhodium complex. Publisher Copyright: {\textcopyright} 2019 American Chemical Society.",
year = "2019",
month = jun,
day = "7",
doi = "10.1021/acs.orglett.9b00820",
language = "English",
volume = "21",
pages = "3895--3899",
journal = "Organic Letters",
issn = "1523-7060",
publisher = "American Chemical Society",
number = "11",
}