Abstract
It was demonstrated by PMR spectroscopy that alkylidene derivatives of vic-(Nalkylhydrazino) thiols in solutions exist exclusively in the cyclic form, i.e., as perhydro-1,3,4-thiadiazines. Only pinacolone derivatives undergo reversible isomerization to the corresponding hydrazones. The thermodynamic parameters of the ring-chain equilibria were determined. The static stereochemistry and the dynamics of the conformational transitions of perhydro-1,3,4-thiadiazines are discussed.
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