Abstract
13C NMR spectra of a series of 1,3-di- and 1,2,3-trisubstituted imidazolidines with aryl, alkyl and aralkyl groups are analyzed and their spectroscopic parameters correlated with conformational features. Assignments were confirmed by means of two dimensional spectra of heteronuclear correlation HMQC and HMBC. Heterocyclic carbons are highly influenced by the nature of the substituent on adjacent nitrogen. Thus, carbon atoms adjacent to a nitrogen substituted with an alkyl or aralkyl group appear in the spectrum at 6 ca. 53 ppm as double doublets with 1 J C - H 134 and 145 Hz, due to a definite orientation of the substituent. Instead, carbon atoms adjacent to an N-aryl group appear at higher fields (6 ca. 47 ppm) as triplets with 1 J C - H ca 141-143 Hz.
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