1: 90 percent / CH2Cl2 2: 1.) N,N'-carbonyldiimidazole (CDI) / 1.) THF, 1 h, 2.) THF, RT, 8 h View Scheme

1: 97 percent / benzyltrimethylammonium dichloroiodate, CaCO3 / CH2Cl2; methanol / 48 h 2: 98 percent / 10percent aq. KOH / 1 h / Heating 3: 1.) N,N'-carbonyldiimidazole (CDI) / 1.) THF, 1 h, 2.) THF, RT, 8 h View Scheme

1: 98 percent / 10percent aq. KOH / 1 h / Heating 2: 1.) N,N'-carbonyldiimidazole (CDI) / 1.) THF, 1 h, 2.) THF, RT, 8 h View Scheme

1,1'-carbonyldiimidazole 1.) THF, 1 h, 2.) THF, RT, 8 h; Yield given. Multistep reaction;

sodium azide; acetic acid; sodium nitrite 1.) 0 deg C, 4 min, 2.) water, RT, 3 min; Yield given. Multistep reaction;