1: 1.) 2,4,6-trichlorobenzoyl chloride, Et3N, 2.) 4-dimethylaminopyridine / 1.) toluene, room temperature, 2 h, 2.) toluene, overnight. 2: 31 percent / AgNO3, phosphate buffer, N-chlorosuccinimide / acetone / 0.17 h / Ambient temperature; pH=7 4: 80 percent / pyridinium poly(hydrogen fluoride) / tetrahydrofuran / 0 °C View Scheme