1: 79 percent / conc. H2SO4 / 1,2-dichloro-ethane / 6 h / Heating 2: 70 percent / NaH, methanol / xylene / 0.33 h / 20 - 25 °C 3: 1.) NaH / 1.) dimethoxyethane, 25 deg C, 15 min, 2.) dimethoxyethane, reflux, 18 h View Scheme

1: 70 percent / NaH, methanol / xylene / 0.33 h / 20 - 25 °C 2: 1.) NaH / 1.) dimethoxyethane, 25 deg C, 15 min, 2.) dimethoxyethane, reflux, 18 h View Scheme

sodium hydride 1.) dimethoxyethane, 25 deg C, 15 min, 2.) dimethoxyethane, reflux, 18 h; Yield given. Multistep reaction;

sodium ethanolate