Acetylenic peroxides react as radicals in good hydrogen-donor solvents
. Addition to the triple bond leads to monoadducts and attack on the O
-O bond gives unsaturated acetals. The intermediate vinyl radical obta
ined in the first case does not seem to lead to homolytic intramolecul
ar substitution. Unlike their ethylenic homologous these compounds are
not unsaturated heterocycle precursors.