Thiourea is an odorless crystalline compound that was first synthesized by fusing NH4SCN (R. E. Powers, 1951).Today it is manufactured, chiefly in Germany, China, and Japan, by the reaction of H2S and CaCN2. Its uses include photographic processing, rubber manufacture, and organic synthesis. Recently, D. Seidel and co-workers used thiourea and other inexpensive reagents in acylation reactions to give products that can be enantiomerically resolved.
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