Chemistry:Syntin
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| Preferred IUPAC name
21-Methyl-11,21:22,31-tercyclopropane | |
| Other names
1-Methyl-1,2-dicyclopropylcyclopropane; Sintin; Synthin; Tsycklin; Tsiklin
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| Identifiers | |
3D model (JSmol)
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PubChem CID
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| Properties | |
| C10H16 | |
| Molar mass | 136.238 g·mol−1 |
| Density | 0.851 g/mL |
| Boiling point | 158 °C (316 °F; 431 K) |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
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| Infobox references | |
Syntin is a hydrocarbon with the molecular formula C10H16 used as a rocket fuel. It is a mixture of four stereoisomers (see below). It has a density of 0.851 g/mL, and a boiling point of 158 °C. Due to the presence of three strained cyclopropane rings, the molecule has a highly positive enthalpy of formation: ΔfH°(l)= 133 kJ/mol (980 kJ/kg, the average value for the isomeric mixture),[1] bringing additional energy into the combustion process. It has advantages over the traditional hydrocarbon fuels, such as RP-1, due to higher density, lower viscosity and higher specific heat of oxidation.
Syntin was used in the Soviet Union and later Russia as fuel for the Soyuz-U2 rocket from 1982 until 1995.[2][3]
It was first synthesized in the USSR in 1959[1] and brought to mass production in the 1970s. It was prepared in a multi-step synthetic process from easily obtained acetylcyclopropane (the 3rd molecule):
Syntin synthesis 01
After dissolution of the USSR, the production of this fuel was halted due to the expense of the synthesis. On September 3, 1995, Soyuz TM-22, the seventy-first and last Soyuz-U2 rocket launched, being the last rocket fueled with Syntin.[3]
Stereoisomers
Syntin has two stereocenters at the central cyclopropane ring. Thus, four stereoisomers exist:
Four Syntin Stereoisomers
In practice, syntin is used as a racemic mixture (a mixture where all stereoisomers are present in equal amounts).
See also
References
- ↑ 1.0 1.1 A.P., Mesheheryakov; V.G., Glukhovtsev; A.D., Petrov (26 September 1959). "Error: no
|title=specified when using {{Cite web}}" (in ru). Institute of Organic Chemistry, UdSSR Academy of Sciences.. pp. 779–781. http://www.mathnet.ru/links/aad75c8a915bf9d604a2a3200dd4cb2c/dan39595.pdf. - ↑ "Error: no
|title=specified when using {{Cite web}}" (in ru). http://www.lpre.de/energomash/RD-107/index.htm. - ↑ 3.0 3.1 "Error: no
|title=specified when using {{Cite web}}" (in ru). Novosti Kosmonavtiki. 2008. pp. 44–46. http://www.novosti-kosmonavtiki.ru/nk/forum-pic/Omar_NK2008-02.pdf.
Literature
- A. P. Mesheheryakov, V. G. Glukhovtsev, A. D. Petrov, “Synthesis of 1-methyl-1,2-dicyclopropylcyclopropane”, Doklady Akademii Nauk SSSR, 1960, 130, 779-81.
- Yu. P. Semenov, B. A. Sokolov, S. P. Chernykh, A. A. Grigor'ev, O. M. Nefedov, N. N. Istomin, G. M. Shirshov, “Multiple strained-ring alkane as high-performance liquid rocket fuel”, RU 2233385, C2 20040727.
- T. Edwards, “Liquid Fuels and Propellants for Aerospace Propulsion: 1903-2003”, Journal of Propulsion and Power, 2003, 19(6), 1089-1107.
- V. Azov, D. Vorontsov, "The last battle of hydrocarbons?", Novosti Kosmonavtiki, 2008, 18, No. 2 (301), 44-46.
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