copper(I) bromide in tetrahydrofuran T=20°C; 2 h; Inert atmosphere;

1.1: n-butyllithium / tetrahydrofuran; hexane / -78 - 0 °C / Inert atmosphere 1.2: -78 - 20 °C / Inert atmosphere 2.1: potassium hydroxide / diethyl ether / 0.5 h / 0 °C 3.1: copper(I) bromide / tetrahydrofuran / 2 h / 20 °C / Inert atmosphere View Scheme

1,4-bis(2,4,6-trimethylphenyl)-1,2,3-triazol-3-ium iodide in tetrahydrofuran T=20°C; 6 h;

copper(l) iodide; water; ammonium chloride; lithium bromide 1.) THF, -5 deg C, 2 h; Yield given. Multistep reaction;