Octane

Octane
Names
	Systematic IUPAC name Octane
	Other names n-Octane;
Identifiers
CAS Number	111-65-9 ;
3D model (JSmol)	Interactive image;
Beilstein Reference	1696875
ChEBI	CHEBI:17590 ;
ChEMBL	ChEMBL134886 ;
ChemSpider	349 ;
DrugBank	DB02440 ;
ECHA InfoCard	100.003.539
EC Number	203-892-1;
Gmelin Reference	82412
KEGG	C01387 ;
MeSH	octane
PubChem CID	356;
RTECS number	RG8400000;
UNII	X1RV0B2FJV ;
UN number	1262
CompTox Dashboard (EPA)	DTXSID0026882 ;
	InChI InChI=1S/C8H18/c1-3-5-7-8-6-4-2/h3-8H2,1-2H3 Key: TVMXDCGIABBOFY-UHFFFAOYSA-N ;
	SMILES CCCCCCCC;
Properties
Chemical formula	CH3(CH2)6CH3
Molar mass	114.232 g·mol−1
Appearance	Colourless liquid
Odor	Gasoline-like
Density	0.703 g/cm3
Melting point	−57.1 to −56.6 °C; −70.9 to −69.8 °F; 216.0 to 216.6 K
Boiling point	125.1 to 126.1 °C; 257.1 to 258.9 °F; 398.2 to 399.2 K
Solubility in water	0.007 mg/dm3 (at 20 °C)
log P	4.783
Vapor pressure	1.47 kPa (at 20.0 °C)
Henry's law; constant (kH)	29 nmol/(Pa·kg)
Conjugate acid	Octonium
Magnetic susceptibility (χ)	−96.63·10−6 cm3/mol
Refractive index (nD)	1.398
Viscosity	0.509 mPa·s (25 °C); 0.542 mPa·s (20 °C);
Thermochemistry
Heat capacity (C)	255.68 J/(K·mol)
Std molar; entropy (S⦵298)	361.20 J/(K·mol)
Std enthalpy of; formation (ΔfH⦵298)	−252.1 to −248.5 kJ/mol
Std enthalpy of; combustion (ΔcH⦵298)	−5.53 to −5.33 MJ/mol
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H225, H304, H315, H336, H410
Precautionary statements	P210, P261, P273, P301+P310, P331
NFPA 704 (fire diamond)	1 3 0
Flash point	13.0 °C (55.4 °F; 286.1 K)
Autoignition; temperature	220.0 °C (428.0 °F; 493.1 K)
Explosive limits	0.96 – 6.5%
	Lethal dose or concentration (LD, LC):
LDLo (lowest published)	428 mg/kg (mouse, intravenous)
	NIOSH (US health exposure limits):
PEL (Permissible)	TWA 500 ppm (2350 mg/m3)
REL (Recommended)	TWA 75 ppm (350 mg/m3) C 385 ppm (1800 mg/m3) [15-minute]
IDLH (Immediate danger)	1000 ppm
Related compounds
Related alkanes	Methane; Ethane; Propane; Butane; Pentane; Hexane; Heptane;
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Octane is a hydrocarbon and an alkane with the chemical formula C₈H₁₈, and the condensed structural formula CH₃(CH₂)₆CH₃. Octane has many structural isomers that differ by the location of branching in the carbon chain. One of these isomers, 2,2,4-trimethylpentane (commonly called iso-octane), is used as one of the standard values in the octane rating scale.

Octane is a component of gasoline and petroleum. Under standard temperature and pressure, octane is an odorless, colorless liquid. Like other short-chained alkanes with a low molecular weight, it is volatile, flammable, and toxic. Octane is 1.2 to 2 times more toxic than heptane.^[5]

Isomers

N-octane has 23 constitutional isomers. 8 of these isomers have one stereocenter; 3 of them have two stereocenters.

Achiral Isomers:

Chiral Isomers:

Production and Use

In petrochemistry, octanes are not typically differentiated or purified as specific compounds. Octanes are components of particular boiling fractions.^[6]

A common route to such fractions is the alkylation reaction between iso-butane and 1-butene, which forms iso-octane.^[7]

Octane is commonly used as a solvent in paints and adhesives.

N-octane is the octane isomer that has the longest carbon skeleton. Unlike its constitutional isomers, it has a very low knock resistance.	The octane isomer, iso-octane, is used as one of the standards for octane ratings. It has a rating of 100 by definition.	The octane isomer 2,3,3-Trimethylpentane has an octane rating exceeding 100.

References

^ "octane - Compound Summary". PubChem Compound. USA: National Center for Biotechnology Information. 16 September 2004. Identification and Related Records. Retrieved 6 January 2012.
^ ^a ^b ^c ^d NIOSH Pocket Guide to Chemical Hazards. "#0470". National Institute for Occupational Safety and Health (NIOSH).
^ Dymond, J. H.; Oye, H. A. (1994). "Viscosity of Selected Liquid n-Alkanes". Journal of Physical and Chemical Reference Data. 23 (1): 41–53. Bibcode:1994JPCRD..23...41D. doi:10.1063/1.555943. ISSN 0047-2689.
^ "Octane". Immediately Dangerous to Life or Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).
^ "1988 OSHA PEL Project - Octane | NIOSH | CDC". www.cdc.gov. 2020-02-27. Retrieved 2024-04-19.
^ "Fractionation". www.appliedcontrol.com. Retrieved 2024-04-19.
^ Ross, Julian (January 1986). "Ullmann's Encyclopedia of industrial chemistry". Applied Catalysis. 27 (2): 403–404. doi:10.1016/s0166-9834(00)82943-7. ISSN 0166-9834.

External links

International Chemical Safety Card 0933
NIOSH Pocket Guide to Chemical Hazards. "#0470". National Institute for Occupational Safety and Health (NIOSH).
Dr. Duke's Phytochemical and Ethnobotanical Databases, Octane, [1]

[1] "octane - Compound Summary". PubChem Compound. USA: National Center for Biotechnology Information. 16 September 2004. Identification and Related Records. Retrieved 6 January 2012.

[PGCH-2] NIOSH Pocket Guide to Chemical Hazards. "#0470". National Institute for Occupational Safety and Health (NIOSH).

[Dymond1994-3] Dymond, J. H.; Oye, H. A. (1994). "Viscosity of Selected Liquid n-Alkanes". Journal of Physical and Chemical Reference Data. 23 (1): 41–53. Bibcode:1994JPCRD..23...41D. doi:10.1063/1.555943. ISSN 0047-2689.

[4] "Octane". Immediately Dangerous to Life or Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).

[5] "1988 OSHA PEL Project - Octane | NIOSH | CDC". www.cdc.gov. 2020-02-27. Retrieved 2024-04-19.

[6] "Fractionation". www.appliedcontrol.com. Retrieved 2024-04-19.

[7] Ross, Julian (January 1986). "Ullmann's Encyclopedia of industrial chemistry". Applied Catalysis. 27 (2): 403–404. doi:10.1016/s0166-9834(00)82943-7. ISSN 0166-9834.

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