Reactions of Thiourea with Chloro- and Bromoacetic Acids
The reaction of chloroacetic acid with thiourea represents an SN2 substitution of chlorine by sulphur atom and is about two orders of magnitude slower than that of bromoacetic acid.Chloroacetate ion reacts slower than chloroacetic acid by only about 30percent.The acid catalyzed splitting off of hydroxyl group from the formed tetrahedral intermediate is rate-limiting in the cyclization of the S-carboxylatomethyleneisothiouronium salt, formation of the intermediate being rate-limiting below pH 2.
Kavalek, Jaromir,Said-El-Bahaie,Sterba, Vojeslav
p. 263 - 268
(2007/10/02)
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