Acetone thiosemicarbazone

Acetone thiosemicarbazone^[1]

Names
IUPAC name (Propan-2-ylideneamino)thiourea
Other names Acetone thiosemicarbazide; Dimethyl ketone thiosemicarbazone; Thiosemicarbazone acetone; NSC 711; 2-(1-Methylethylidene)hydrazinecarbothioamide
Identifiers
CAS Number	1752-30-3
Abbreviations	ATSC
ChEMBL	ChEMBL500557
ChemSpider	2050659
EC Number	217-137-9
Jmol interactive 3D	Image Image
PubChem	2770166
InChI InChI=1S/C4H9N3S/c1-3(2)6-7-4(5)8/h1-2H3,(H3,5,7,8) Key: FQUDPIIGGVBZEQ-UHFFFAOYSA-N InChI=1/C4H9N3S/c1-3(2)6-7-4(5)8/h1-2H3,(H3,5,7,8) Key: FQUDPIIGGVBZEQ-UHFFFAOYAR
SMILES CC(=NNC(=S)N)C S=C(N)N/N=C(\C)C
Properties
Chemical formula	C4H9N3S
Molar mass	131.20 g·mol^−1
Appearance	White crystals
Melting point	172 to 175 °C (342 to 347 °F; 445 to 448 K)
Hazards
Main hazards	Toxic
Safety data sheet	MSDS
EU classification (DSD)	T+
R-phrases	R21 R25 R26
S-phrases	S22 S28 S36/37/39 S45
NFPA 704	4
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]

Acetone thiosemicarbazone is listed as an extremely hazardous substance because of its high toxicity.

References

1. Acetone thiosemicarbazone, chemicalland21.com
2. US patent 3637632, Traynor, Lee, "Agents for shortstopping free radical polymerization of vinylidene monomers", issued 1972-Jan-25 
3. Acetone thiosemicarbazone (ATSC), 88chem.com