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Unsymmetrical dimethylhydrazine (abbreviated as UDMH; also known as 1,1-dimethylhydrazine, heptyl or Geptil) is a chemical compound with the formula H 2 NN(CH 3) 2 that is primarily used as a rocket propellant. [4] At room temperature, UDMH is a colorless liquid, with a sharp, fishy, ammonia-like smell typical of organic amines.
Dimethylhydrazine is the name of two compounds with the molecular formula C 2 H 8 N 2. These are: unsymmetrical dimethylhydrazine (1,1-dimethylhydrazine), with both methyl groups bonded to the same nitrogen atom; symmetrical dimethylhydrazine (1,2-dimethylhydrazine), with one methyl group bonded to each of the two nitrogen atoms
1,1-dimethylhydrazine (unsymmetrical dimethylhydrazine, UDMH) and 1,2-dimethylhydrazine (symmetrical dimethylhydrazine) are hydrazines where two hydrogen atoms are replaced by methyl groups. UDMH is the easier of the two to manufacture and is a fairly common rocket fuel.
Symmetrical dimethylhydrazine (1,2-dimethylhydrazine) Unsymmetrical dimethylhydrazine (1,1-dimethylhydrazine) Trimethylhydrazine. 1,1,2-trimethylhydrazine; 1,1,1-trimethylhydrazinium (cationic and exists as a variety of salts e.g. 1,1,1-trimethylhydrazinium iodide) Tetramethylhydrazine. 1,1,2,2-tetramethylhydrazine
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]
1,1-dimethylhydrazine: 57-14-7 C 2 H 8 N 2: 1,2-dimethylhydrazine: 540-73-8 (CH 3) 2 SO: dimethyl sulfoxide: 67-68-5 C 4 H 8 O 2: 1,4-Dioxane: 123-91-1 C 2 H 6 O ...
The RP-1/LOX Merlin on the Falcon 9 can also be restarted. [12] The most common hypergolic fuels, hydrazine, monomethylhydrazine and unsymmetrical dimethylhydrazine, and oxidizer, nitrogen tetroxide, are all liquid at ordinary temperatures and pressures.
Aerozine 50 is a 50:50 mix by weight of hydrazine and unsymmetrical dimethylhydrazine (UDMH), [1] [2] developed in the late 1950s by Aerojet General Corporation as a storable, high-energy, hypergolic fuel for the Titan II ICBM rocket engines.