trimethylsilyl trifluoromethanesulfonate; 4,4'-diphenylsulfide in trifluoroacetic acid T=0°C; 0.5 h; New peptide deprotection procedure: hard-soft acid-base concept; the role of soft bases (thioanisole, dimethylsulfide, diphenylsulfide) employed; effect of var. hard bases; var. reaction cond.; Product distribution;

methanesulfonic acid; 3-methyl-phenol in dichloromethane T=25°C; 0.5 h;