Reactivity of bis(2-chloroprop-2-enyl)sulfide in the system hydrazine hydrate/alkali: A quantum chemical insight

The reactivity of bis(2-chloroprop-2-enyl)sulfide in the system hydrazine hydrate/alkali has been studied using quantum-chemical methods. The B2PLYP-D2//B3LYP approach shows a good agreement between the relative values of activation barriers compared to high-precision CBS//Q-B3. The correction for the entropy change during the transition from the gas phase to the binary solvent hydrazine hydrate is calculated. The IEF PCM model was parameterized for hydrazine hydrate solvent. The studied reaction routes includes (i) a competition between migration of the C=C bond and dehydrochlorination of bis(2-chloroprop-2-enyl)sulfide; (ii) 1,3-prototropic rearrangements of bis (allenyl)sulfide resulting from a dehydrochlorination; (iii) the possible substitution of sulfur and chlorine atoms with hydrazine. The probable formation of the thiiranium and thiirenium cations formation in the above has also been evaluated.