1: With 2,2'-azo-bisisobutyronitrile in tetrahydrofuran T=60 - 68°C; 2.5 h; Inert atmosphere; 2: T=20 - 25°C; 24 h; Inert atmosphere;

1: 64 percent / Et3B; O2 / dioxane; hexane / 20 °C 2: 100 percent / MCPBA / CH2Cl2 / 20 °C View Scheme

in toluene under N2 or Ar, exclusion of oxygen and moisture, addn. of soln. of amine in toluene to a part of soln. of Co compound in toluene at 25°C, addn. of the rest of this soln. together with (C6H5)2HPS during 2 h, 15 h; decantation, evapn. of solvent in vac., residue dissolved in n-hexane, filtration of ((Et)(i-Pr)2NH)I and excess ICo(CO)2(P(C6H11)3)2, crystn. at -5°C, recrystn. from n-hexane at -5°C; elem. anal.;

potassium hydroxide in dimethyl sulfoxide T=20°C;

potassium hydroxide; dibenzo-18-crown-6 in dichloromethane T=8 - 10°C; 2 h;

sodium hydroxide in dichloromethane T=5 - 7°C; 0.5 h;

potassium hydroxide in dimethyl sulfoxide T=20°C;

potassium carbonate in acetonitrile T=20°C; 5 h; Further byproducts given;

potassium carbonate in acetonitrile T=20°C; 5 h; Further byproducts given;

potassium hydroxide in dimethyl sulfoxide T=20°C;