1: 60 percent / 40percent methanol. Triton-B, t-butanol / xylene / 6 h / Heating 2: 60 percent / p-toluenesulfonic acid / benzene / 10 h / Ambient temperature 3: 95 percent / NaBH4 / methanol; tetrahydrofuran / 2 h / Ambient temperature 4: 60 percent / H2 / 10percent Pd/C View Scheme

1: 40 percent / 40percent methanolic Triton-B, tert-butanol / xylene / 6 h / Heating 2: 35 percent / p-toluenesulfonic acid / benzene / 10 h / Ambient temperature View Scheme