Abstract: | Three new compounds, one with the molecular formula C6H8S and two corresponding to C7H10S have been isolated together with the main product, divinyl sulphide, from the reaction products of acetylene with sodium sulphide. Structure determination through 1H and 13C NMR with selective 13C? {1H} decoupling, showed C6H8S to be a new heterocyclic compound, 2-thiabicyclo3.2.0]hept-3-ene, and the two C7H10S compounds its exo- and endo-6-methyl derivatives. Since the spectral parameters of these heterocycles were not known, all possible structures corresponding to the molecular formulae were considered. |