toluene-4-sulfonic acid in benzene 2 h; Heatingfurther catalists: acetic acid, trifluor acetic acid; further solvent: none; further temperature: r.t; further reaction time; Product distribution;

in methanol 0.333333 h; Ambient temperatureIrradiation;

1: 95 percent / tetrahydrofuran / Heating 2: 2.) HCl / 1.) aq. EtOH, -20 deg C, irradiation View Scheme