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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.
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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
The most common hypergolic fuels, hydrazine, monomethylhydrazine and unsymmetrical dimethylhydrazine, and oxidizer, nitrogen tetroxide, are all liquid at ordinary temperatures and pressures. They are therefore sometimes called storable liquid propellants. They are suitable for use in spacecraft missions lasting many years.
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 ]
Unsymmetrical dimethylhydrazine; Symmetrical dimethylhydrazine; Ethylenediamine, or ethane-1,2-diamine This page was last edited on 24 July 2024, at 03:30 ...