carbon dioxide; ammonia; potassium hydroxide; zinc oxide in water T=50 - 100°C; pH=8.57 - 10.67; Product distribution / selectivity;

in ethanol addn. of Zn-compound to hot soln. of ligand with stirring;; filtration of ppt.; washed (EtOH); dried (vacuum, 80°C);

in ethanol mixing the soln. of Zn(CH3CO2)2 and 2-mercaptobenzothiazole with stirring, 30 min cooling in ice water bath, filtration; collection of the precipitate, washing (de-ionized water), vac. drying at 60 °C overnight;

in chlorobenzene 7 h; Heating;

in benzene Heating;

in benzene Heating;