Symmetrical dimethylhydrazine, or 1,2-dimethylhydrazine, is the organic compound with the formula (CH3NH)2. It is one of the two isomers of dimethylhydrazine. Both isomers are colorless liquids at room temperature, with properties similar to those of methylamines. Symmetrical dimethylhydrazine is a potent carcinogen that acts as a DNA methylating agent.[5][6] The compound has no commercial value, in contrast to its isomer unsymmetrical dimethylhydrazine (1,1-dimethylhydrazine), which is used as a rocket fuel.[7]
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| Names | |
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| Preferred IUPAC name
1,2-Dimethylhydrazine[2] | |
| Other names
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| Identifiers | |
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3D model (JSmol) |
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| Abbreviations | SDMH[1] |
| ChEBI | |
| ChEMBL | |
| ChemSpider |
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| ECHA InfoCard | 100.149.162 
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| KEGG |
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| MeSH | 1,2-Dimethylhydrazine |
PubChem CID |
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| RTECS number |
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| UNII | |
| UN number | 2382 |
CompTox Dashboard (EPA) |
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| Properties[3] | |
| C2H8N2 | |
| Molar mass | 60.100 g·mol−1 |
| Appearance | Colourless liquid |
| Odor | Ichtyal, ammoniacal |
| Density | 827.4 kg m−3 (at 20 °C) |
| Melting point | −9 °C (16 °F; 264 K) |
| Boiling point | 87 °C; 188 °F; 360 K |
| Miscible | |
| Thermochemistry | |
Heat capacity (C) |
171.04 J K−1 mol−1 |
Std molar |
199.15 J K−1 mol−1 |
Std enthalpy of |
−1987–−1978 kJ mol−1 |
| Hazards | |
| GHS labelling:[4] | |
  
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| Danger | |
| H301, H311, H331, H350, H411 | |
| P201, P202, P261, P264, P270, P271, P273, P280, P281, P301+P310, P302+P352, P304+P340, P308+P313, P311, P312, P322, P330, P361, P363, P391, P403+P233, P405 | |
| Related compounds | |
Related compounds |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
It is used to induce colon tumors in experimental animals—particularly mice and feline cell samples.[2][8][9]
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