Design und Synthese von Kohlenstoffnanoröhrensegmenten

Abstract

Ein langfristiges Ziel der organischen Synthesechemie und der Nanokohlenstoffchemie ist die selektive und vorhersagbare Synthese von strukturell gleichförmigen Kohlenstoffnanoröhren (CNTs). Dieser Aufsatz konzentriert sich auf synthetische Arbeiten, die dieses Ziel einer gesteuerten Synthese von chiralen CNTs durch die organische Synthese von CNT‐Segmenten und mithilfe eines durch organische Template vermittelten CNT‐Wachstums in Reichweite bringen.

Synthesis and Structure of Functionalized Zigzag Hydrocarbon Belts

“…In summary, we have shown the construction of a biscarbonyl-embedded octahydrobelt [8]arene by means of stitching all fjords of resorcin [4]arene backbone in a stepwise manner. Further chemical transformations of cyclic ketone moieties of the resulting product enabled the divergent synthesis of edgefunctionalized zigzag hydrocarbon belts.…”

“…For example, soon after the first proposal as synthetic macrocyclic hosts in early 1980s, [1] fully conjugated belt[n]arenes or cyclacenes provoked great interest of synthetic chemists. [2][3][4][5][6][7] Recent years witness the renaissance of study [8][9][10][11][12][13][14][15][16][17] since belt[n]arenes can be viewed as the shortest segments of zigzag carbon nanotubes and are predicted to possess extraordinary physical and chemical properties. In addition to elusive belt[n]arenes, whose synthesis in bulk still remains as a formidable challenge, [15,16] other classic examples of belts include cucurbiturils [18,19] and cavitands.…”

“…Closure of all fjords of resorcin[n]arenes (n = 4, 6) by means of multiple intramolecular alkylation reactions enabled the straightforward synthesis of partially hydrogenated belt[n]arene (n = 8, 12) compounds. [15,16] Subsequent oxidative aromatization and spontaneous cycloaddition reaction of octahydrobelt [8]arene produced outer surface functionalized belt molecules. [15] To explore the generality of the fjord-stitching protocol and to construct edge-functionalized molecular belts, we undertook the current study of the synthesis of carbonyl-embedded molecular belts.…”

Synthesis, Structures, and Photophysical Properties of Alternating Donor–Acceptor Cycloparaphenylenes

“…Severall inear donor-acceptor oligomers and polymers have been synthesized and appliedf or these purposes. [3,4] For example,d ecreasing the ring size of CPPs decreases the HOMO-LUMO gap as ar esult of significant bending andt orsion effects. [3,4] For example,d ecreasing the ring size of CPPs decreases the HOMO-LUMO gap as ar esult of significant bending andt orsion effects.…”

New Members of the Editorial Board and International Advisory Board

“…[3] Itami ist außerdem Mitglied der Editorial oder Advisory Boards von Advanced Synthesis &C atalysis, Chemistry-An Asian Journal und The Chemical Record,u nd 2013-2016 gehçrte er zudem dem International Advisory Board von ChemCat-Chem an. Itami arbeitet mit seiner Gruppe an der Entwicklung von Katalysatoren zu C-H-Aktivierung und von Reaktionen fürdie Synthese funktioneller Moleküle wie molekularer Nanokohlenstoffe, p-konjugierter Materialien, Pharmaka und niedermolekularer Verbindungen fürd ie Pflanzenbiologie und -chronobiologie.I ne inem Aufsatz in der Angewandten Chemie hat er das Design und die Synthese von Kohlenstoffnanorçhrensegmentend iskutiert.…”