A ¹³C NMR Study of 3,5,5-Trimethyl-4-Oxoimidazolidine-2-Thione and 3,5,5-Trimethyl Imidazolidine-2,4-Dithione Complexes with Molecular Diiodine

Abstract

The ¹³C NMR spectra of C.T. complexes between donors containing a thioamido group and diiodine are reported. The rapid exchange of donor between the free and the adduct state makes the variation in the position of the resonance depend on the ratio of these two species.

Data are comparatively examined with those of the related molecules: 5,5-dimethyl-4-oxoimidazolidine-2-thione and 5,5-dimethylimidazolidine-2,4-dithione. The influence of diiodine on the ¹³C chemical shifts shows that I₂ affects C(2) more than C(4) and confirms that, in the two compounds with two C=S groups, the interaction of I₂ takes place with the sulphur bonded to C(2).

Key Words:

• ¹³C NMR
• HYDANTOIN DERIVATIVES
• CYCLIC THIOAMIDES
• C.T. COMPLEXES WITH I₂