Please use this identifier to cite or link to this item: https://doi.org/10.1002/chem.201102506
Title: Intramolecular domino electrophilic and thermal cyclization of peri-ethynylene naphthalene oligomers
Authors: Huang, X.
Zeng, L.
Zeng, Z.
Wu, J. 
Keywords: cyclization
domino reactions
fluoranthenes
hydrocarbons
polycycles
Issue Date: 23-Dec-2011
Citation: Huang, X., Zeng, L., Zeng, Z., Wu, J. (2011-12-23). Intramolecular domino electrophilic and thermal cyclization of peri-ethynylene naphthalene oligomers. Chemistry - A European Journal 17 (52) : 14907-14915. ScholarBank@NUS Repository. https://doi.org/10.1002/chem.201102506
Abstract: The intramolecular electrophilic or thermal cyclization of arylene ethynylene precursors recently became a powerful method for the synthesis of new polycyclic aromatic hydrocarbons (PAHs). In this work, we investigated in detail the synthesis and intramolecular cyclization reaction of a series of peri-ethynylene naphthalene oligomers in which the ethynylene units are fixed in close proximity within the naphthalene framework. The high reactivity of these precursors led to simultaneous thermal cyclization reactions, even during their syntheses. Electrophilic cyclizations with iodine were also undertaken. Several new PAHs containing five-membered rings, for example, indeno[2,1-a]phenalene, acenaphtho[1,2-a]pyrene, and benzo- or naphtho-annulated fluoranthene derivatives, were synthesized and their structures were unambiguously determined by X-ray crystallographic analysis. Plausible mechanisms were proposed and it was demonstrated that oligomers most probably underwent intramolecular domino cyclization via either radical or cationic intermediates. The photophysical and electrochemical properties of these new PAHs were investigated and some of them displayed amphoteric redox behavior, due to the existence of five-membered rings. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Source Title: Chemistry - A European Journal
URI: http://scholarbank.nus.edu.sg/handle/10635/94084
ISSN: 09476539
DOI: 10.1002/chem.201102506
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