Symmetrical dimethylhydrazine

Symmetrical dimethylhydrazine
	Skeletal formula of 1,2-dimethylhydrazine with all implicit hydrogens shown
	Ball and stick model of 1,2-dimethylhydrazine
Names
	Preferred IUPAC name 1,2-Dimethylhydrazine
	Other names N,N'-Dimethylhydrazine; sym-Dimethylhydrazine; Hydrazomethane;
Identifiers
CAS Number	540-73-8 ;
3D model (JSmol)	Interactive image;
Abbreviations	SDMH
ChEBI	CHEBI:73755 ;
ChEMBL	ChEMBL162921 ;
ChemSpider	1282 ;
ECHA InfoCard	100.149.162
KEGG	C19176 ;
MeSH	1,2-Dimethylhydrazine
PubChem CID	1322;
RTECS number	MV2625000;
UNII	IX068S9745 ;
UN number	2382
CompTox Dashboard (EPA)	DTXSID0041228 ;
	InChI InChI=1S/C2H8N2/c1-3-4-2/h3-4H,1-2H3 Key: DIIIISSCIXVANO-UHFFFAOYSA-N ;
	SMILES CNNC;
Properties
Chemical formula	C2H8N2
Molar mass	60.100 g·mol−1
Appearance	Colourless liquid
Odor	Fishy, 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
Solubility in water	Miscible
Thermochemistry
Heat capacity (C)	171.04 J K−1 mol−1
Std molar; entropy (S⦵298)	199.15 J K−1 mol−1
Std enthalpy of; combustion (ΔcH⦵298)	−1987–−1978 kJ mol−1
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H301, H311, H331, H350, H411
Precautionary statements	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	Biurea; Daminozide;
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Symmetrical dimethylhydrazine (SDMH), 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, UDMH), which is used as a rocket fuel.^[7] Symmetrical dimethylhydrazine is more toxic than unsymmetrical dimethylhydrazine and is therefore an unwanted impurity in UDMH.^[8]