1: 85 percent / hydrogen / 10percent palladium on calcium carbonate / tetrahydrofuran; methanol / 2 h 2: 43.6 percent / p-toluenesulfonic acid monohydrate / ethanol / 0.5 h / Heating View Scheme

1: 86.6 percent / 16percent methanolic ammonia / methanol / 67 h / 5 °C 2: 85 percent / hydrogen / 10percent palladium on calcium carbonate / tetrahydrofuran; methanol / 2 h 3: 43.6 percent / p-toluenesulfonic acid monohydrate / ethanol / 0.5 h / Heating View Scheme

toluene-4-sulfonic acid in ethanol 0.5 h; Heating;