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13C NMR spectra of 1,3-dipyridyl- and pyridylphenylthioureas. Chemical shift assignments and conformational implications

✍ Scribed by L.V. Sudha; D.N. Sathyanarayana; S. Manogaran

Publisher: Elsevier Science
Year: 1986
Tongue: English
Weight: 434 KB
Volume: 42
Category: Article
ISSN: 1386-1425
DOI: 10.1016/0584-8539(86)80247-1

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✦ Synopsis

The 13C NMR spectra of a series of 1,3-dipyridyl-and pyridylphenylthioureas have been obtained. Complete analyses of the experimental spectra have provided the chemical shifts and coupling constants. The spectra of dipyridylthioureas over a temperature range showed important changes which could be attributed to an intramolecular conversion between the two equivalent E,Z and Z,E conformations.

The coalescence temperature of the '% signals leads to a AG* of _ 58.0 kJ mol-' for the dynamic process involved. The results show that pyridylphenyl thioureas exist in a single conformation at ambient temperature.

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