How many isomers does heptane have

Heptane C.7H16 

Teflon closure

Clear, colorless liquid
Petroleum, essential oils of pine
molar mass 100.202 g / mol

AGW 500 ml / m3 (TRGS 900)
density 0.6837 g / cm3   
Melting point −90.549 ° C
boiling point +98.38 ° C
Water solubility at 25 ° C 2 mg / l
Refractive index (20 ° C)  1,3855
Explosion limit1 to 6.7% by volume (air)
Flash point −4 ° C
Ignition point +204 ° C
GHS 02
GHS 07
GHS 08
GHS 09
Hazard classes + category   
Flammable liquids 2
Skin corrosion / irritation 2
Specific target organ toxicity e. CNS 3
Aspiration hazard 1
Acute aquatic hazard 1
Hazardous to waters chron. 1
HP rates (see also note)       
H 225, 304, 315, 336, 400, 410
P 210, 261, 273, 280.1-3, 301 + 310, 331,
304+340, 403+235     
disposal G 1
Print a labelGerman designation 
Synonyms (German)
English designation 
CAS 142-82-5Heptane 
Note for schools and do-it-yourselfers: At room temperature, explosive mixtures with air can form. There is an acute danger to life if the liquid is swallowed, especially if it gets into the lungs, as breathing is blocked. When working with heptane or gasoline fractions, protective goggles, protective gowns and protective gloves made of nitrile rubber are required. Good ventilation must be ensured. Containers must be kept out of the reach of children and tightly closed in a well-ventilated and cool place.

Effect on the human body
Inhaling the vapors leads to dizziness and headaches; in higher concentrations they have a narcotic effect. Heptane irritates the eyes and the mucous membranes, nausea and vomiting may occur if swallowed. Intensive skin contact leads to cracked skin, and eczemas can also form.
n-Heptane is a colorless liquid that smells like petrol. It is hardly soluble in water; it dissolves very well in organic solvents such as ethyl alcohol or benzene. Fats and oils also dissolve well in heptane. The liquid is volatile and evaporates at room temperature. This creates explosive gas mixtures with the air. The flash point is −4 ° C, so the alkane can be ignited at room temperature with a flame as an ignition source. It burns with a weakly sooting flame.

Heptane can be ignited with a flame at room temperature.

There are nine isomers of heptane. The branched isomers have compared to the unbranched n-Heptane has a lower boiling point. In addition, their anti-knock properties are better. Like hexane, heptane reacts with halogens in a substitution reaction.


Heptane is a universal solvent and extraction agent, for example linseed oil can be extracted from linseed with heptane. In platinum reforming, toluene is obtained from heptane by dehydrocyclization. Heptane is contained in paints and adhesives as a thinner.