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Nmr-study of (6-X-7-Y-8-Z)-substituted 3-dimethylamino-2H-1-benzopyranones

T. Liptaj, P. Hrnčiar, A. Gáplovský, and J. Donovalová

Department of Physical Chemistry, Faculty of Chemical Technology, Slovak Technical University, CS-81237 Bratislava

 

Abstract: Previous suggestion, concerning the product formed in the reaction of salicylaldehyde, betaine, and acetic anhydride, was confirmed by an in-depth NMR analysis. The product is 34iimethylamino-2H-l-benzopyranone. In reactions with substituted salicylaldehydes, substituted products are formed. Unambiguous assignment of their NMR resonances was made on the basis of the results of several advanced NMR experiments. Transfer of the substituent chemical shift (SCS) between the two rings of the studied molecules, as well as SCS of dimethylamino group are briefly discussed.

Full paper in Portable Document Format: 441a71.pdf

 

Chemical Papers 44 (1) 71–76 (1990)

Monday, October 25, 2021

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