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Names | |
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Preferred IUPAC name Henicosane | |
Other names n-Heneicosane | |
Identifiers | |
3D model (JSmol) | |
1748500 | |
ChEBI | |
ChemSpider | |
ECHA InfoCard | 100.010.109 |
EC Number |
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PubChem CID | |
UNII | |
CompTox Dashboard (EPA) | |
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Properties | |
C21H44 | |
Molar mass | 296.583 g·mol−1 |
Appearance | Waxy solid |
Density | 0.7919 g mL−1 |
Melting point | 40.5 °C (104.9 °F; 313.6 K) |
Boiling point | 356.10 °C; 672.98 °F; 629.25 K |
2.9·10−11 g/L | |
log P | 10.65 |
Vapor pressure | 8.73·10−5 mm Hg |
Henry's law constant (kH) | 120 atm·m3/mole |
Refractive index (nD) | 1.4441 |
Hazards | |
NFPA 704 (fire diamond) | |
Flash point | 113 °C (235 °F; 386 K) |
Related compounds | |
Related alkanes | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). |
Heneicosane is the organic compound with the formula CH3(CH2)19CH3. It is the straight chain, saturated C21 hydrocarbon. It is a white wax.
Heneicosane is used as a pheromone by the queen or king termites in the species Reticulitermes flavipes . [1] It also attracts mosquitoes in the genus Aedes and can be used in mosquito baits. [2] This works in nature as the hydrocarbon is produced in the skin of the larva. A 1:100000 fraction in water is the most attractive, but if the concentration is 1:1000 then mosquitoes are repelled instead. [3] Heneicosane is one of the major components of the safflower flower essential oil ( Carthamus tinctorius ). [4] All parts of the plant Periploca laevigata contain heneicosane. [5] Rosa damascena flower essential oil contains 5% heneicosane. [6] Sambucus nigra contains 2.3%.