Tetramethylsuccinonitrile

Tetramethylsuccinonitrile

Names
IUPAC name Tetramethylsuccinonitrile
Other names Butanedinitrile, 2,2,3,3-tetramethyl
Identifiers
CAS Number	3333-52-6 N
3D model (Jmol)	Interactive image
Abbreviations	TMSN
ChemSpider	17700 Y
ECHA InfoCard	100.129.378
MeSH	tetramethylsuccinonitrile
PubChem	18745
UNII	116XMU2GHK Y
InChI InChI=1S/C8H12N2/c1-7(2,5-9)8(3,4)6-10/h1-4H3 Y Key: ZVQXQPNJHRNGID-UHFFFAOYSA-N Y
SMILES CC(C)(C#N)C(C)(C)C#N
Properties
Chemical formula	C8H12N2
Molar mass	136.20 g·mol−1
Appearance	Colourless crystals
Odor	odorless
Density	1.07 g mL−1
Melting point	169.1 °C; 336.3 °F; 442.2 K
Boiling point	sublimes
Thermochemistry
Std enthalpy of formation (ΔfHo298)	13.6–16.2 kJ mol−1
Std enthalpy of combustion (ΔcHo298)	−4.8767–−4.8793 MJ mol−1
Hazards
Lethal dose or concentration (LD, LC):
LD50 (median dose)	38.9 mg/kg (rat, oral)
LCLo (lowest published)	28 ppm (mouse, 3 hr) 6 ppm (rat, 30 hr)
US health exposure limits (NIOSH):
PEL (Permissible)	TWA 3 mg/m3 (0.5 ppm) [skin]
REL (Recommended)	TWA 3 mg/m3 (0.5 ppm) [skin]
IDLH (Immediate danger)	5 ppm
Related compounds
Related alkanenitriles	Propanenitrile Aminopropionitrile Malononitrile Pivalonitrile Acetone cyanohydrin Butyronitrile Succinonitrile Glutaronitrile
Related compounds	DBNPA
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N  (what is YN ?)
Infobox references

Tetramethylsuccinonitrile or TMSN is an organic compound with the formula (C(CH₃)₂CN)₂. Classified as a dinitrile, it is a colorless and odorless solid. TMSN is the by-product from the use of some radical initiators used in polymer manufacture.

TMSN is derived from 2,2'-azobis-isobutyronitrile:

AIBN is a common radical initiator in the manufacture of polyvinyl chloride polymers.

Because PVC is pervasive and can contain TMSN, the safety aspects of this dinitrile has generated interest.

Symptoms of large or short exposure to this substance include convulsions, dizziness, headache, nausea, vomiting or even unconsciousness, hence affects central nervous system.

In regards to occupational exposures, the Occupational Safety and Health Administration and the National Institute for Occupational Safety and Health have set limits for dermal exposure at 3 mg/m³ over an eight-hour time-weighted average.