Cyclic [5]Paraphenyleneacetylene: Synthesis, Properties, and Formation of a Ring-in-Ring Complex Showing a Considerably Large Association Constant and Entropy Effect

In the ring: The title compound ([5]CPPA), the smallest belt‐shaped conjugated system known to date, forms a considerably stable ring‐in‐ring complex with [8]CPPA (see picture). [8]CPPA⊃[5]CPPA has a smaller contact area than [9]CPPA⊃[6]CPPA but its large Ka and ΔH values reveal that the interaction...

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Veröffentlicht in:Angewandte Chemie International Edition 2007-01, Vol.46 (7), p.1086-1088
Hauptverfasser: Kawase, Takeshi, Nishiyama, Yoshitaka, Nakamura, Takamitsu, Ebi, Takahiro, Matsumoto, Kouzou, Kurata, Hiroyuki, Oda, Masaji
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container_end_page 1088
container_issue 7
container_start_page 1086
container_title Angewandte Chemie International Edition
container_volume 46
creator Kawase, Takeshi
Nishiyama, Yoshitaka
Nakamura, Takamitsu
Ebi, Takahiro
Matsumoto, Kouzou
Kurata, Hiroyuki
Oda, Masaji
description In the ring: The title compound ([5]CPPA), the smallest belt‐shaped conjugated system known to date, forms a considerably stable ring‐in‐ring complex with [8]CPPA (see picture). [8]CPPA⊃[5]CPPA has a smaller contact area than [9]CPPA⊃[6]CPPA but its large Ka and ΔH values reveal that the interaction results from the electrostatic attractive force rather than the dispersion force.
doi_str_mv 10.1002/anie.200603707
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source Wiley Online Library Journals Frontfile Complete
subjects cyclic alkynes
host-guest systems
inclusion compounds
noncovalent interactions
strained molecules
title Cyclic [5]Paraphenyleneacetylene: Synthesis, Properties, and Formation of a Ring-in-Ring Complex Showing a Considerably Large Association Constant and Entropy Effect
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