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Briefly, this preparation involves first adding the acetamide to a suspension of sodium hydride in an organic solvent, preferably a N,N-dimethylacetamide/benzene solvent system. The cessation of hydrogen indicates completion of the reaction after which the reaction mixture is cooled and carbon disulfide added slowly. When tetrahydrofuran is the solvent employed, a reaction time of approximately 1.5 hours is required to provide yields in excess of 80 percent while when a mixture of N,N-dimethylacetamide/toluene is used, yields in excess of 80 percent are obtained in approximately 20 minutes.

1. customcompletion of the reaction after which the reaction mixture
2. temperatureis cooled
3. customa reaction time of approximately 1.5 hours
4. customto provide
5. customyields in excess of 80 percent while when
6. customyields in excess of 80 percent
7. customare obtained in approximately 20 minutes