Propadienethione synthesis

As mentioned earlier, flash vacuum thermolysis (FVT) is a very useful technique for the synthesis of reactive species20. It has been applied to the synthesis of thioketenes288 (equation 56), such as propadienethione, which were trapped by reaction with dimethylamine. 

Ripoll and coworkers288 have reported the cleavage of silylated ketene dithioacetals under flash vacuum thermolysis (FVT) conditions20, which allowed the synthesis of propadienethione by combining this process along with the retro-Diels-Alder reaction (see Section III.F.5). Propadienethione was not isolated, but it underwent addition of the nucleophiles present in the reaction mixture288 (equation 65). 

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