1: benzene-1,2-diol With potassium carbonate in DMF (N,N-dimethyl-formamide) T=40°C; 1 h; 2: 2,2-dimethylpropane-1,3-diyl-bis-(4-methylbenzenesulfonate) in DMF (N,N-dimethyl-formamide) T=140°C; 5 h;