Study of C-H...N specific intramolecular interactions in heteroaryl vinyl ethers,by means of regression and cluster analysis of parameters of1H and13C NMR parameters

By means of regression and cluster analysis of the parameters of the¹ and¹³C NMR spectra of the vinyloxy group in a broad series of aryl and heteroaryl vinyl ethers, it has been proven statistically that these parameters are abnormal for ethers in which the vinyloxy group occupies a position adjacent to an endocyclic nitrogen atom; this is evidence for the existence of a C-H...N specific intramolecular interaction between the -hydrogen atoms of the vinyl group and the endocyclic nitrogen.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 6, pp. 1344–1351, June, 1991.