3-Methyl-1-pentyn-3-ol Property

Melting point:

-30 °C

Boiling point:

121-122 °C(lit.)

Density 

0.866 g/mL at 25 °C(lit.)

vapor density 

3 (vs air)

vapor pressure 

6.5 mm Hg ( 20 °C)

refractive index 

n20/D 1.431(lit.)

Flash point:

80 °F

storage temp. 

Flammables area

solubility 

Cellosolve: miscible

pka

13.34±0.29(Predicted)

form 

clear liquid

color 

Colorless to Light yellow

explosive limit

1.8-16.0%(V)

Merck 

13,5870

BRN 

969340

CAS DataBase Reference

77-75-8(CAS DataBase Reference)

NIST Chemistry Reference

Meparfynol(77-75-8)

EPA Substance Registry System

3-Methyl-1-pentyn-3-ol (77-75-8)

Safety

Hazard Codes 

Xn,F+

Risk Statements 

10-22-51/53-2017/10/22

Safety Statements 

23-36-61

RIDADR 

UN 1986 3/PG 3

WGK Germany 

1

RTECS 

SC4900000

HazardClass 

3

PackingGroup 

III

HS Code 

29052990

HS Code 

29280090

Toxicity

LD50 orally in mice, rats, guinea pigs: 600-900 mg/kg (Margolin)

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Warning

Hazard statements

H226Flammable liquid and vapour

H302Harmful if swallowed

Precautionary statements

P210Keep away from heat/sparks/open flames/hot surfaces. — No smoking.

3-Methyl-1-pentyn-3-ol Chemical Properties,Usage,Production

Chemical Properties

Clear slightly yellow liquid or low melting solid

Originator

Citodorm,Haury

Uses

3-Methylpent-1-yn-3-ol is an inhibitor; used in method for preparing high-insulation solvent-free silicone resin for composite insulator.

Uses

Stabilizer in chlorinated solvents, viscousreducer, electroplating brightener, intermediate insyntheses of hypnotics and isoprenoid chemicals,solvent for polyamide resins, acid inhibitor, preven-tion of hydrogen embrittlement, medicine (soporificand anesthetic).

Definition

ChEBI: Methylpentynol is a ynone.

Manufacturing Process

To 5 parts of sodium acetylene in absolute ether 6 parts of dry methyl ethyl ketone was slowly dropwise added with ice cooling and stirring. Than the reaction mixture was poured into excess of acetic acid by ice cooling and extracted with ether. The ether extract was washed with solution of potash for removing the diluted acetic acid and dried over potassium carbonate. The ether was distilled off and residual colorless oil methylpentynol had BP at 120°-121°C. Instead of sodium acetylene the solution of sodium acetylene in liquid ammonia may be successfully used.

brand name

Dormison (Schering).

Therapeutic Function

Sedative

Hazard

Moderate fire risk. Toxic.