potassium hydroxide; oxygen in ethanol 0.166667 h;

3-ethyl-5-(2-hydroxyethyl)-4-methyl-1,3-thiazolium bromide; 1,8-diazabicyclo[5.4.0]undec-7-ene in tert-butyl alcohol T=40°C; 1 h; Product distribution; Further Variations:ratio of reagents;

in tetrahydrofuran 0.75 h;

in diethyl ether