cyclohexa-1,4-diene; palladium on activated charcoal in N,N-dimethyl-formamide 1.5 h;

1: 99 percent / 1.4-cyclohexadiene / Pd/C / dimethylformamide / 1.5 h 2: 31 percent / POcl3 / acetonitrile / 1 h / 0 °C 3: 78 percent / H2 / Pd/C / ethanol / 48 h View Scheme