2,4-DIMETHYLPENTANE

CAS NO.：108-08-7
Empirical Formula: C7H16
Molecular Weight: 100.2
MDL number: MFCD00008945
EINECS: 203-548-0
Update Date: 2024-12-18 14:08:57

What is 2,4-DIMETHYLPENTANE?

Chemical properties

Colorless liquid with an odor resembling heptane. An odor threshold concentration of 940 ppb_v was reported by Nagata and Takeuchi (1990).

The Uses of 2,4-DIMETHYLPENTANE

It is not only used for synthesizing WeiNiGuan, but also used in binder and coating industry. It is used for synthesizing resin fiber. It is also used as intermediates and adhesives in oil drop coagulation thickener.

Source

In diesel engine exhaust at a concentration of 0.3% of emitted hydrocarbons (quoted, Verschueren, 1983). Schauer et al. (1999) reported 2,4-dimethylpentane in a diesel-powered medium-duty truck exhaust at an emission rate of 410 μg/km.
California Phase II reformulated gasoline contained 2,2-dimethylbutane at a concentration of 15,700 mg/kg. Gas-phase tailpipe emission rates from gasoline-powered automobiles with and without catalytic converters were 2.92 and 354 mg/km, respectively (Schauer et al., 2002).

Environmental Fate

Photolytic. Based on a photooxidation rate constant of 5.0 x 10^-12 cm³/molecule?sec for the reaction of 2,3-dimethypentane and OH radicals in air, the half-life is 27 h (Alltshuller, 1991).
Chemical/Physical. Complete combustion in air yields carbon dioxide and water vapor. 2,4- Dimethylpentane will not hydrolyze because it has no hydrolyzable functional group.

Purification Methods

Extract it repeatedly with conc H2SO4, wash with water, dry and distil it. Alternatively percolated it through silica gel (previously heated in nitrogen to 350o). Purify it by azeotropic distillation with EtOH, followed by washing out the EtOH with water, drying and distilling. [Beilstein 1 IV 406.]

Properties of 2,4-DIMETHYLPENTANE

Melting point:	−123 °C(lit.)
Boiling point:	80 °C(lit.)
Density	0.673 g/mL at 25 °C(lit.)
vapor density	3.48 (vs air)
vapor pressure	3.29 psi ( 37.7 °C)
refractive index	n20/D 1.381(lit.)
Flash point:	10 °F
solubility	Soluble in acetone, benzene, chloroform, alcohol and ether.
form	neat
pka	>14 (Schwarzenbach et al., 1993)
color	Colorless to Almost colorless
explosive limit	~7%
Odor Threshold	0.94ppm
Water Solubility	4.41mg/L(25 ºC)
BRN	1696855
Henry's Law Constant	2.94(atm?m³/mol) at 25 °C (Mackay and Shiu, 1981)
Exposure limits	ACGIH: TWA 400 ppm; STEL 500 ppm
Dielectric constant	1.9（-7℃）
CAS DataBase Reference	108-08-7(CAS DataBase Reference)
EPA Substance Registry System	2,4-Dimethylpentane (108-08-7)

Safety information for 2,4-DIMETHYLPENTANE

Signal word	Danger
Pictogram(s)	Flame Flammables GHS02 Exclamation Mark Irritant GHS07 Health Hazard GHS08 Environment GHS09
GHS Hazard Statements	H225:Flammable liquids H304:Aspiration hazard H315:Skin corrosion/irritation H336:Specific target organ toxicity,single exposure; Narcotic effects H410:Hazardous to the aquatic environment, long-term hazard
Precautionary Statement Codes	P210:Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P233:Keep container tightly closed. P273:Avoid release to the environment. P331:Do NOT induce vomiting. P301+P310:IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician. P303+P361+P353:IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.