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2-Methyl-1-butanol

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2-Methyl-1-butanol Basic information

Product Name:
2-Methyl-1-butanol
CAS:
137-32-6
MF:
C5H12O
MW:
88.15
EINECS:
205-289-9
Mol File:
137-32-6.mol
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2-Methyl-1-butanol Chemical Properties

Melting point:
−70 °C(lit.)
alpha 
-0.1~+0.1°(20℃/D)(neat)
Boiling point:
130 °C mm Hg(lit.)
Density 
0.819 g/mL at 20 °C(lit.)
vapor density 
3 (vs air)
vapor pressure 
3 mm Hg ( 20 °C)
refractive index 
n20/D 1.411
FEMA 
3998 | (+/-)-2-METHYL-1-BUTANOL
Flash point:
110 °F
storage temp. 
Flammables area
solubility 
water: slightly soluble3.6g/a00g at 30°C
form 
Liquid
pka
15.24±0.10(Predicted)
color 
Clear colorless to very slightly yellow
PH
7 (H2O)
explosive limit
1.2-10.3%(V)
Water Solubility 
3.6 g/100 mL (30 ºC)
Merck 
14,6030
JECFA Number
1199
BRN 
1718810
CAS DataBase Reference
137-32-6(CAS DataBase Reference)
NIST Chemistry Reference
1-Butanol, 2-methyl-(137-32-6)
EPA Substance Registry System
2-Methyl-1-butanol (137-32-6)
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Safety Information

Hazard Codes 
Xn
Risk Statements 
10-20-37-66
Safety Statements 
46-24/25
RIDADR 
UN 1105 3/PG 3
WGK Germany 
3
RTECS 
EL5250000
Autoignition Temperature
725 °F
TSCA 
Yes
HazardClass 
3
PackingGroup 
III
HS Code 
29051500
Hazardous Substances Data
137-32-6(Hazardous Substances Data)
Toxicity
LD50 orally in Rabbit: 4170 mg/kg LD50 dermal Rabbit 2900 mg/kg

MSDS

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2-Methyl-1-butanol Usage And Synthesis

Chemical Properties

clear colorless to very slighlty yellow liquid

Chemical Properties

Amyl alcohols (pentanols) have eight isomers. All are flammable, colorless liquids, except the isomer 2,2- dimethyl-1-propanol, which is a crystalline solid.

Chemical Properties

(+/–)2-Methyl-1-butanol has a cooked, roasted aroma with fruity or alcoholic undernotes.

Occurrence

Reportedly present in over 120 natural food products, including apple, apricot, banana, orange, bilberry, black currant, cranberry, papaya, strawberry, tomato and alcoholic beverages

Uses

2-Methyl-1-butanol is a whiskey-scented amyl alcohol that is naturally present in all fruits wine and beer. 2-Methyl-1-butanol is commercially used as a solvent in paints and oils and as flavorant in many processed foods. 2-Methyl-1-butanol has a characteristic redolence, which is thought to account for its active properties as an attractant for hornets and certain wasps, such as yellowjackets, in traps. As a biochemical active ingredient, it has a non-toxic mode of action – targeted pests are killed through physical entrapment.

Uses

Solvent, organic synthesis (introduction of active amyl group), lubricants, plasticizers, additives for oils and paints.

Definition

The active alcohol from fusel oil. The synthetic product is a racemic mixture of both dextroand levorotatory compounds and therefore not optically active.

Preparation

Prepared from hydroboration of 2-methyl-1-butene. (–)2-Methyl-1-butanol is isolated by fractional distillation of fusel oil

Production Methods

2-methyl-1-butanol are refined from ethanol production as fusel oil. Isoamyl alcohols are used as solvents for oils, fats, resins, and waxes; in the plastics industry in spinning polyacrylonitrile; and in manufacturing lacquers, chemicals, and pharmaceuticals.

Aroma threshold values

Odor threshold in air: detection at 0.14 mg/m3; recognition at 0.83 to 1.7 mg/m3.

Hazard

Moderate fire and explosion risk. Toxic by ingestion, inhalation, and skin absorption.

Safety Profile

Moderately toxic by skin contact and intraperitoneal routes. Mddly toxic by ingestion. An eye, skin, and mucous membrane irritant. Can cause deafness, delirium, headache, nausea, and vomiting. Flammable liquid when exposed to heat, flame, or oxidizers. Explosive in the form of vapor when exposed to heat or flame. Incompatible with H2S3. To fight fire, use alcohol foam, spray, mist, dry chemical. When heated to decomposition it emits acrid smoke and irritating fumes. See also ALCOHOLS.

Potential Exposure

(n-isomer); Suspected reprotoxic hazard, Primary irritant (w/o allergic reaction), (iso-, primary): Possible risk of forming tumors, Primary irritant (w/o allergic reaction), (sec-, active primary-, and other isomers) Primary irritant (w/o allergic reaction). Used as a solvent in organic synthesis and synthetic flavoring, pharmaceuticals, corrosion inhibitors; making plastics and other chemicals; as a flotation agent. The (n-isomer) is used in preparation of oil additives, plasticizers, synthetic lubricants, and as a solvent.

Shipping

UN2811 Pentanols, Hazard Class: 3; Labels: 3- Flammable liquid. UN1987 Alcohols, n.o.s., Hazard Class: 3; Labels: 3-Flammable liquid.

Purification Methods

Reflux the butanol with CaO, distil, reflux with magnesium and again fractionally distil it. A small sample of highly purified material is obtained by fractional crystallisation after conversion into a suitable ester such as the trinitrophthalate or the 3-nitrophthalate. The latter is converted to the cinchonine salt in acetone and recrystallised from CHCl3 by adding pentane. The salt is saponified, extracted with ether, and fractionally distilled. [Terry et al. J Chem Eng Data 5 403 1960, Beilstein 1 IV 1666.]

Incompatibilities

Forms an explosive mixture with air. Contact with strong oxidizers and hydrogen trisulfide may cause fire and explosions. Incompatible with strong acids. Violent reaction with alkaline earth metals forming hydrogen, a flammable gas.

Waste Disposal

Dissolve or mix the material with a combustible solvent and burn in a chemical incinerator equipped with an afterburner and scrubber. All federal, state, and local environmental regulations must be observed.

2-Methyl-1-butanol Preparation Products And Raw materials

Preparation Products

Raw materials

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