1: 1.) p-toluene-sulfonic acid monohydrate; 2.) hydrogen / 2.) PtO2 / 1.) benzene, reflux, 2.5 h; 2.) ethanol, 2.5 atm. 2: hydrogen / 10 percent Pd-on-charcoal / ethanol / 4 h / 1520 Torr View Scheme