ISSN:
0009-2940
Keywords:
Conformational analysis
;
Benzene, donor-acceptor-substituted
;
Benzene ring, distortion of
;
Cyanine concept
;
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The π system of 1a may adopt markedly different electronic structures with concomitant strong conformational preferences for the six-membered ring. Neutral 1a can exist either in a quinoid boat form or as a twist boat, formally resulting from the coupling of an anionic with a cationic trimethinecyanine. Deprotonation gives a rigid quinoid boat structure; protonation occurs at a ring atom to form an equally rigid cyanine.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/cber.19931260924
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