dicobalt octacarbonyl; hydrogen in tetrahydrofuran T=100°C; 16 h; Product distribution; Further Variations:TemperaturesCO/H2 ratio;

dipotassium peroxodisulfate; 3-pyridinecarboxylic acid ethyl ester; tetrabutylammomium bromide; copper(ll) bromide in acetonitrile T=20°C; 24 h; Inert atmosphere; Reagent/catalystSolvent;

1.1: trifluoromethanesulfonic anhydride; 2-chloropyridine / CH2Cl2 / -78 - 0 °C 1.2: 78 percent / CH2Cl2; tetrahydrofuran / -78 - 0 °C 2.1: 77 percent / ammonium hexafluorophosphate; 2-dicyclohexylphosphino-2',6'-dimethoxy-1,1'-biphenyl / CpRuCl(PPh3)2 / toluene / 105 °C View Scheme