ISSN:
0749-1581
Keywords:
13C NMR
;
Temperature dependent
;
1HNMR spectra
;
Pyrylium/thiopyrylium salts
;
Pyrones/thiopyrones
;
Rotational barriers
;
Partial double bond character
;
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Temperature-dependent 13C and 1H NMR spectra of three series of six-membered heteroaromatic systems with NR2 substituents attached to pyrylium/thiopyrylium salts and pyrones/thiopyrones have been recorded. The rotational barriers thus determined about the exocyclic partial double bonds are discussed in terms of dominating mesomeric structures, in order to describe the electronic state and the spatial conditions in the molecular framework. Cyanine and merocyanine substructures have been identified by NMR and express the electronic state predominantly present in the compounds.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/mrc.1260250807
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