Formation of cyclo-octyne by pyrolysis of cyclo-octeno-1,2,3-selenadiazole
Abstract
The reaction of cyclo-octanone semicarbazone (2) with SeO2 leads to cyclo-octeno-1,2,3-selenadiazole (3) from which, on heating to 170–220°, cyclo-octyne (5), the lowest stable cycloalkyne, can be prepared in good yields.