Phenacyl and para-substituted phenacyl halides react with ethylenethiourea in acetone at room temperature to yield 2-phenacylmercapto-2-iiidwohium halides (I). Treatment of an aqueous solution of thie salt with ammonium hydroxide yields the Corresponding free baae, 2-phenacylmercapto-Ziidazoline (11). When the para group is hydrogen, bromine, methyl mercapto or phenyl, the infrared spectra of these salts show a carbonyl absorption in the ...
![3-(4-bromophenyl)-5,6-dihydroimidazo[2,1-b][1,3]thiazole,hydrobromide Structure](https://image.chemsrc.com/caspic/105/74038-89-4.png)
![3-(4-bromophenyl)-5,6-dihydroimidazo[2,1-b][1,3]thiazole Structure](https://image.chemsrc.com/caspic/059/7496-59-5.png)