trimethylsilyl trifluoromethanesulfonate in dichloromethane P=11250900 Torr; 1.) -78 deg C, 30 min, 2.) 20 deg C, 30 min;

toluene-4-sulfonic acid; orthoformic acid triethyl ester in toluene; benzene T=40°C; P=11250900 Torr; 48 h;