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Thiocarbonyl compounds from β-substituted vinylald- and -ketimmonium derivatives

“…A comparison of the 13 C NMR chemical shifts of compounds 66 and model 5,5-dimethyl-3-methylthiocyclohex-2-en-1-thione (23d) has been carried out. All the data obtained allowed a conclusion concerning the existence of dithionesulfide 66 in the gas phase and in solution, presumably as a non-planar cis-trans conformer (figure 4) [44]. Other pathways to the synthesis of bis(5,5-dimethyl-3-thioxocyclohex-1-enyl) sulfide (66) have been studied [41].…”

“…It is the product of hydrothiolysis of one immonium group of the salt 58 [39]. The conformation adopted by dithioxosulfide 66 has been studied using two-dimensional NMR spectroscopy, dipole moments and non-empirical quantum-chemical calculations (6-31G * basis set) [44]. Results of calculations of the energies and dipole moments of four possible conformers of compounds 66 have shown the non-planar cis-trans conformer to be the most stable.…”