pyridinium p-toluenesulfonate in acetone 4 h; Heating;

1: 2.) p-toluenesulfonic acid / 1.) benzene, reflux, 28 h, 2.) benzene, reflux, 23 h 2: 1.) NaH / 1.) DMF 3: 87 percent / PPTS / acetone / 4 h / Heating View Scheme

1: 1.) NaH / 1.) DMF 2: 87 percent / PPTS / acetone / 4 h / Heating View Scheme