NMR studies on intramolecular mobility of ortho-substituted push-pull phenyl butadienes†

T Freier, M Michalik, K Peseke, H Reinke

Index: Freier, Thomas; Michalik, Manfred; Peseke, Klaus; Reinke, Helmut Journal of the Chemical Society. Perkin Transactions 2, 1999 , # 6 p. 1265 - 1271

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Abstract

The 1H and 13C NMR spectra of a series of 3-aryl-2-cyano-5, 5-bis (methylthio) penta-2, 4- dienenitriles (3) and 3-aryl-2-cyano-5-dimethylamino-5-methylthiopenta-2, 4-dienenitriles (4) with different ortho-phenyl substituents were recorded. The NMR data are compared with those of the corresponding para-substituted compounds 1 and 2. Dynamic 1H NMR measurements showed rotation processes about the C-2, C-3, C-3, C-4, C-4, C-5, and C-5 ...