1: 2,3-dichloro-5,6-dicyano-1,4-benzoquinone / CH2Cl2; H2O / 0.5 h / Ambient temperature 2: 1.) 2,4,6-trichlorobenzoyl chloride, Et3N, 2.) 4-dimethylaminopyridine / 1.) toluene, room temperature, 2 h, 2.) toluene, overnight. 3: 31 percent / AgNO3, phosphate buffer, N-chlorosuccinimide / acetone / 0.17 h / Ambient temperature; pH=7 5: 80 percent / pyridinium poly(hydrogen fluoride) / tetrahydrofuran / 0 °C View Scheme