1: 52 percent / PPh3, LiCl, 2,6-(1,1-dimethylethyl)phenol / Pd(dba)2 / dioxane / 20 h / Heating 2: 78 percent / PPh3, CO / Pd(OAc)2 / acetonitrile / 46 h / 3040 Torr / Heating View Scheme

With  sulfuric acid; nitric acid 14 h;  Ambient temperature;