engleski

Merocyanine isomers of spiro[indolino-indolopyrans]: 1H and 13C NMR and X-ray crystal structure study

The synthesis of stable merocyanine isomers 4 and 5 of the corresponding spyro[indolino-indolopyrans] is described. The structure of 4 and 5 was deduced on the basis of their 1H and 13C NMR spectra. Geometrical data from X-ray structure analysis show that indolo and indolino rings in 4 are coplanar with the central diene bridge. The bond length shortening of the central single bond and the heterocyclic moieties indicate an electron delocalization over the whole molecule.

spyro[indolino-indolopyrans] ; merocyanine isomers ; 1H and 13C NMR ; X-ray crystall structure study

Rad je prezentiran na skupu The Tenth Dubrovnik International Course and Conference MATH/CHEM/COMP, održanom u Dubrovniku, Hrvatska, 1995. god.