1,4-dioxane

1: 90 percent / sodium / benzene / 12 h / Ambient temperature 2: 1.) diphosphorus tetraiodide, 2.) diazomethane / 1.) chloroform, room temp., 24 h, 2.) ether, 20 deg C, 0.5 h View Scheme

triethylamine T=80°C;