Tetramethylsuccinonitrile
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| Names | |||
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| Preferred IUPAC name
Tetramethylbutanedinitrile | |||
| Other names
Butanedinitrile, 2,2,3,3-tetramethyl | |||
| Identifiers | |||
3D model (JSmol) |
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| Abbreviations | TMSN | ||
| ChemSpider | |||
| ECHA InfoCard | 100.129.378 | ||
| MeSH | tetramethylsuccinonitrile | ||
PubChem CID |
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| UNII | |||
CompTox Dashboard (EPA) |
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| Properties | |||
| C8H12N2 | |||
| Molar mass | 136.198 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 (ΔfH⦵298) |
13.6–16.2 kJ mol−1 | ||
Std enthalpy of combustion (ΔcH⦵298) |
−4.8767–−4.8793 MJ mol−1 | ||
| Hazards | |||
| GHS labelling: | |||
| Danger | |||
| H300, H310, H315, H319, H330, H370, H372, H412 | |||
| P260, P262, P264, P270, P271, P273, P280, P284, P301+P310, P302+P350, P302+P352, P304+P340, P305+P351+P338, P307+P311, P310, P314, P320, P321, P322, P330, P332+P313, P337+P313, P361, P362, P363, P403+P233, P405, P501 | |||
| 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) | ||
| NIOSH (US health exposure limits): | |||
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 | ||
| Safety data sheet (SDS) | ICSC 1121 | ||
| Related compounds | |||
Related alkanenitriles |
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Related compounds |
DBNPA | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references | |||
Tetramethylsuccinonitrile or TMSN is an organic compound with the formula (C(CH3)2CN)2, classified as a dinitrile, and a colorless and odorless solid derived from 2,2'-azobis-isobutyronitrile, a common radical initiator in the manufacture of PVC:
- [(CH3)2C(CN)]2N2 → [(CH3)2C(CN)]2 + N2.
Because PVC is pervasive and can contain TMSN, the safety aspects of this dinitrile has generated interest.
In regards to occupational exposures, the U.S. Occupational Safety and Health Administration and the U.S. National Institute for Occupational Safety and Health have set limits for dermal exposure at 3 mg/m3 over an eight-hour time-weighted average.