sodium hydroxide; tetrabutylammomium bromide in tetrahydrofuran; water; toluene T=25°C; 23 h; Product distribution / selectivity;

potassium hydroxide; tetrabutylammomium bromide in tetrahydrofuran; water; toluene T=25 - 40°C; pH=5.3 - 5.5; 4 h; Product distribution / selectivity;

sodium hydroxide; tetrabutylammomium bromide in water; N,N-dimethyl-formamide T=25 - 40°C; pH=5.3 - 5.5; 6 h; Product distribution / selectivity;