2-Methylpentane

{{Chembox

| Verifiedfields = changed

| Watchedfields = changed

| verifiedrevid = 477214643

| ImageFileL1 = 2-Methylpentane 2.svg

| ImageFileL1_Ref = {{chemboximage|correct|??}}

| ImageSizeL1 = 100

| ImageNameL1 = Skeletal formula of 2-methylpentane

| ImageFileR1 = 2-Methylpentane 3D.png

| ImageSizeR1 = 140

| ImageName = Ball-and-Stick model of 2-methylpentane

| PIN = 2-Methylpentane{{Cite web|title=2-methylpentane - Compound Summary|url=https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=7892&loc=ec_rcs|work=PubChem Compound|publisher=National Center for Biotechnology Information|accessdate=5 March 2012|location=USA|date=26 March 2005|at=Identification and Related Records}}

| OtherNames = Isohexane{{CRC91|page=3-364}}

|Section1={{Chembox Identifiers

| CASNo = 107-83-5

| CASNo_Ref = {{cascite|correct|CAS}}

| PubChem = 7892

| ChemSpiderID = 7604

| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}

| EINECS = 203-523-4

| UNNumber = 1208

| RTECS = SA2985000

| MeSHName = 2-methylpentane

| ChEBI_Ref = {{ebicite|changed|EBI}}

| ChEBI = 88374

| ChEMBL = 30909

| ChEMBL_Ref = {{ebicite|correct|EBI}}

| Beilstein = 1730735

| SMILES = CCCC(C)C

| UNII_Ref = {{fdacite|changed|FDA}}

| UNII = 49IB0U6MLD

| StdInChI = 1S/C6H14/c1-4-5-6(2)3/h6H,4-5H2,1-3H3

| StdInChI_Ref = {{stdinchicite|correct|chemspider}}

| StdInChIKey = AFABGHUZZDYHJO-UHFFFAOYSA-N

| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}

}}

|Section2={{Chembox Properties

| C=6 | H=14

| Appearance = Colorless liquid

| Odor = Odorless

| Density = 653 mg mL⁻¹

| MeltingPtK = 113 to 127

| BoilingPtK = 333 to 335

| LogP = 3.608

| VaporPressure = 46.7 kPa (at 37.7 °C)

| HenryConstant = 5.7 nmol Pa⁻¹ kg⁻¹

| RefractIndex = 1.371

| MagSus = −75.26·10⁻⁶ cm³/mol

}}

|Section3={{Chembox Thermochemistry

| DeltaHf = −205.3 – −203.3 kJ mol⁻¹

| Entropy = 290.58 J K⁻¹ mol⁻¹

| HeatCapacity = 194.19 J K⁻¹ mol⁻¹

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|Section4={{Chembox Hazards

| GHSPictograms = {{GHS flame}} {{GHS exclamation mark}} {{GHS health hazard}} {{GHS environment}}

| GHSSignalWord = DANGER

| HPhrases = {{H-phrases|225|304|315|336|411}}

| PPhrases = {{P-phrases|210|261|273|301+310|331}}

| NFPA-H = 2

| NFPA-F = 3

| NFPA-R = 0

| FlashPtC = −7

| AutoignitionPtC = 306

| ExploLimits = 1.2–7%

| PEL = none{{PGCH|0323}}

}}

|Section5={{Chembox Related

| OtherFunction_label = alkanes

| OtherFunction = {{Unbulleted list|Isopentane|3-Methylpentane|3-Ethylpentane|2-Methylhexane|3-Methylhexane}}

| OtherCompounds = 2-Ethyl-1-butanol

}}

}}

2-Methylpentane, trivially known as isohexane, is a branched-chain alkane with the molecular formula C₆H₁₄. It is a structural isomer of hexane composed of a methyl group bonded to the second carbon atom in a pentane chain.

As of early 1990s, it was present in American{{Cite journal |last1=Doskey |first1=Paul V. |last2=Porter |first2=Joseph A. |last3=Scheff |first3=Peter A. |date=November 1992 |title=Source Fingerprints for Volatile Non-Methane Hydrocarbons |url=https://www.tandfonline.com/doi/full/10.1080/10473289.1992.10467090 |journal=Journal of the Air & Waste Management Association |language=en |volume=42 |issue=11 |pages=1437–1445 |doi=10.1080/10473289.1992.10467090 |bibcode=1992JAWMA..42.1437D |issn=1047-3289}} and European{{Cite journal |last1=Östermark |first1=Ulf |last2=Petersson |first2=Göran |date=1992-09-01 |title=Assessment of hydrocarbons in vapours of conventional and alkylate-based petrol |url=https://publications.lib.chalmers.se/records/fulltext/local_72590.pdf |journal=Chemosphere |volume=25 |issue=6 |pages=763–768 |doi=10.1016/0045-6535(92)90066-Z |bibcode=1992Chmsp..25..763O |issn=0045-6535}} gasoline in small amounts, and by 2011 its share in US gas varied between 2 and 8%.{{cite web |date=2011 |title=Hydrocarbon Composition of Gasoline Vapor Emissions from Enclosed Fuel Tanks |url=https://nepis.epa.gov/Exe/ZyPURL.cgi?Dockey=P100GPED.TXT |website=nepis.epa.gov |publisher=United States Environmental Protection Agency}} Using a quantitative structure-activity relationship (QSAR) prediction model, 2-Methylpentane has a research octane number (RON) of 75, motor octane number (MON) of 77, and cetane number (CN) of 29.{{cite book | doi=10.1039/b602366p | chapter=Catalytic strategies for improving specific fuel properties | title=Catalysis | date=2007 | last1=Do | first1=Phuong T. M. | last2=Crossley | first2=Steven | last3=Santikunaporn | first3=Malee | last4=Resasco | first4=Daniel E. | pages=33–64 | isbn=978-0-85404-244-9 }}