-Alkynes Ethyne(acetylene)is used in welding torches because it burns at high temperature Many alkynes are of biological interest Ethyne Capillin is an antifungal agent found naturally Dactylyne is a marine natural product Ethinyl estradiol is a synthetic estrogen used in oral contraceptives Br CH C=C-C=C-CH; Br HO Capillin Dactylyne Ethinyl estradiol [17a-ethynyl-1,3,5(10)-estratriene-3,17 B-diol] – Alkynes • Ethyne (acetylene) is used in welding torches because it burns at high temperature • Many alkynes are of biological interest – Capillin is an antifungal agent found naturally – Dactylyne is a marine natural product – Ethinyl estradiol is a synthetic estrogen used in oral contraceptives