copper(l) chloride in 1,4-dioxane 3 h; Heating;

1: 1.) potassium hydroxide, 65 percent alcohol / 1.) DMF, 1 h, r.t.; 2.) DMF, 70-80 deg C, 16 h 2: 28 percent / cuprous chloride / dioxane / 3 h / Heating View Scheme