It has been shown that 1-acetoxyhexen-5-yn-2 undergoes the diene synthesis reacion with hexacloro- and 5,5-dimethoxytetrachlorocyclopentadienes at 125-130°C due to the end double bond with formation of endo izomers. The synthesized adducts undergo the interaction with triorganosilanes in the presence of H₂PtCl₆^.6H₂O in medium of benzene. The reaction proceeds on triple bond but with preferential yield (77–99%) of β-adduct (relatively oxygen atom)