1: 1,2-bis-(2-hydroxyethoxy)-ethane With sodium hydride in tetrahydrofuran; mineral oil 1 h; Inert atmosphere; 2: propargyl bromide in tetrahydrofuran; mineral oil T=23°C; 48 h; Inert atmosphere;

sodium hydride in tetrahydrofuran T=40°C; 18 h;

sodium hydride in tetrahydrofuran