Acetone thiosemicarbazone

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Acetone thiosemicarbazone[1]
Acetone thiosemicarbazone.png
IUPAC name
Other names
Acetone thiosemicarbazide; Dimethyl ketone thiosemicarbazone; Thiosemicarbazone acetone; NSC 711; 2-(1-Methylethylidene)hydrazinecarbothioamide
3D model (JSmol)
Abbreviations ATSC
ECHA InfoCard 100.015.580
EC Number 217-137-9
Molar mass 131.20 g·mol−1
Appearance White crystals
Melting point 172 to 175 °C (342 to 347 °F; 445 to 448 K)
Main hazards Toxic
Safety data sheet MSDS
R-phrases (outdated) R21 R25 R26
S-phrases (outdated) S22 S28 S36/37/39 S45
NFPA 704
Flammability (red): no hazard code Health code 4: Very short exposure could cause death or major residual injury. E.g., VX gas Reactivity (yellow): no hazard code Special hazards (white): no codeNFPA 704 four-colored diamond
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Acetone thiosemicarbazone is a chemical compound with the molecular formula C4H9N3S. It is used in the plastics industry in the manufacture of polyvinyl chloride (PVC) to terminate the polymerization process.[2][3]

It is classified as an extremely hazardous substance in the United States as defined in Section 302 of the U.S. Emergency Planning and Community Right-to-Know Act (42 U.S.C. 11002), and is subject to strict reporting requirements by facilities which produce, store, or use it in significant quantities.[4]


  1. ^ Acetone thiosemicarbazone,
  2. ^ US patent 3637632, Traynor, Lee, "Agents for shortstopping free radical polymerization of vinylidene monomers", issued 1972-Jan-25 
  3. ^ Acetone thiosemicarbazone (ATSC) Archived February 27, 2012, at the Wayback Machine.,
  4. ^ "40 C.F.R.: Appendix A to Part 355—The List of Extremely Hazardous Substances and Their Threshold Planning Quantities" (PDF) (July 1, 2008 ed.). Government Printing Office. Retrieved October 29, 2011.