1: 93.6 percent / m-CPBA / CH2Cl2 / 12 h / Ambient temperature 2: 89.3 percent / Et3N / benzene / 3 h / Heating View Scheme

1: potassium carbonate / N,N-dimethyl-formamide / 12 h / 50 °C 2: 15 h / 140 °C / Inert atmosphere 3: tris-(dibenzylideneacetone)dipalladium(0); tris(4-trifluoromethylphenyl)phosphine / 1,4-dioxane / 12 h / 80 °C 4: 5 Pd(II)/C(eggshell); hydrogen / ethyl acetate / 16 h / 20 °C View Scheme

bromine in tetrachloromethane

3-chloro-benzenecarboperoxoic acid in dichloromethane 12 h; Ambient temperature;

triethylamine; trichlorophosphate