2,3-Dimethylpentane

2,3-Dimethylpentane
Names
	Preferred IUPAC name 2,3-Dimethylpentane
Identifiers
CAS Number	(racemic): 565-59-3 ; (3S): 7485-45-2; (3R): 54665-46-2;
3D model (JSmol)	(racemic): Interactive image;
ChEBI	(racemic): CHEBI:151115 ;
ChemSpider	(racemic): 10786 ; (3S): 18527723; (3R): 553611;
ECHA InfoCard	100.008.437
EC Number	(racemic): 209-280-0;
PubChem CID	(racemic): 11260; (3S): 22810194; (3R): 638047;
UNII	(racemic): 8HPD5L8920 ;
UN number	1206
CompTox Dashboard (EPA)	(racemic): DTXSID20862203 ;
	InChI InChI=1S/C7H16/c1-5-7(4)6(2)3/h6-7H,5H2,1-4H3/t7-/m0/s1 Key: WGECXQBGLLYSFP-UHFFFAOYSA-N ;
	SMILES (racemic): CCC(C)C(C)C;
Properties
Chemical formula	C7H16
Molar mass	100.205 g·mol−1
Appearance	Colourless liquid
Density	0.7076 g/mL (25 °C), 0.6413 (80 °C), 0.7380 (25 °C, 45 MPa), 0.6891 (80 °C, 45 MPa) (racemic)
Boiling point	89.7 °C (racemic)
Vapor pressure	2.35 psi (37.7 °C)
Viscosity	0.356 mPa s (30 °C), 0.232 (80 °C), 0.624 (30 °C, 60 MPa) (racemic)
Thermochemistry
Heat capacity (C)	34.308 cal/K/mol (−189 °C), 51.647 (20 °C), 58.735 (86.6 °C) (racemic)
Std molar; entropy (S⦵298)	71.02 cal/K/mol (25 °C) (racemic)
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H225, H304, H315, H335, H336, H410
Precautionary statements	P210, P233, P240, P241, P242, P243, P261, P264, P271, P273, P280, P301+P310, P302+P352, P303+P361+P353, P304+P340, P312, P321, P331, P332+P313, P362, P370+P378, P391, P403+P233, P403+P235, P405, P501
Flash point	−7 °C (19 °F; 266 K)
Autoignition; temperature	337 °C (639 °F; 610 K)
Related compounds
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

2,3-Dimethylpentane is an organic compound of carbon and hydrogen with formula C
₇H
₁₆, more precisely CH
₃–CH(CH
₃)–CH(CH
₃)–CH
₂–CH
₃: a molecule of pentane with methyl groups –CH
₃ replacing hydrogen atoms on carbon atoms 2 and 3. It is an alkane ("paraffin" in older nomenclature), a fully saturated hydrocarbon; specifically, one of the isomers of heptane.

Like typical alkanes, it is a colorless flammable compound; under common ambient conditions, it is a mobile liquid, less dense than water.

2,3-Dimethylpentane is notable for being one of the two simplest alkanes with optical (enantiomeric) isomerism. The optical center is the middle carbon of the pentane backbone, which is connected to one hydrogen atom, one methyl group, one ethyl group –C
₂H
₅, and one isopropyl group –CH(CH
₃)
₂. The two enantiomers are denoted (3R)-2,3-dimethylpentane and (3S)-2,3-dimethylpentane. (The other simplest chiral alkane is its structural isomer 3-methylhexane.)

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