ALPHA,P-DIMETHYLSTYRENE Property

Melting point:

−28 °C(lit.)

Boiling point:

186-189 °C(lit.)

Density 

0.904 g/mL at 25 °C(lit.)

refractive index 

n20/D 1.535(lit.)

FEMA 

3144 | P,ALPHA-DIMETHYLSTYRENE

Flash point:

144 °F

storage temp. 

2-8°C

solubility 

Chloroform (Slightly), Methanol (Slightly)

form 

Oil

color 

Colourless

Specific Gravity

0.85

Odor

at 0.10 % in dipropylene glycol. phenolic spicy styrene clove guaiacol

Odor Type

phenolic

Water Solubility 

Insoluble in water, soluble in alcohol, miscible with oils.

JECFA Number

1333

Stability:

Light Sensitive

LogP

3.71

CAS DataBase Reference

1195-32-0(CAS DataBase Reference)

NIST Chemistry Reference

4-CH3C6H4C(CH3)CH2(1195-32-0)

EPA Substance Registry System

p,.alpha.-Dimethylstyrene (1195-32-0)

Safety

Hazard Codes 

Xi

Risk Statements 

36/37/38

Safety Statements 

26-36-37/39

WGK Germany 

2

TSCA 

Yes

HS Code 

29029090

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Warning

Hazard statements

H315Causes skin irritation

H319Causes serious eye irritation

H335May cause respiratory irritation

Precautionary statements

P261Avoid breathing dust/fume/gas/mist/vapours/spray.

P264Wash hands thoroughly after handling.

P264Wash skin thouroughly after handling.

P271Use only outdoors or in a well-ventilated area.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P302+P352IF ON SKIN: wash with plenty of soap and water.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

ALPHA,P-DIMETHYLSTYRENE Chemical Properties,Usage,Production

Chemical Properties

Clear colorless to light yellow liquid

Chemical Properties

p,α-Dimethyl styrene has a citrusy-lemon-like aroma.

Occurrence

Reported found in pepper, coffee, anise and parsley

Uses

α, p-dimethylstyrene has been suggested for use in perfume compositions, mainly as a component in certain artificial essential oils. In Lemon fragrances for industrial masking purposes it may introduce lift, power and freshness.

Preparation

By passing a stream of p-cymene and water vapors over activated aluminum oxide at 730°C.

Definition

ChEBI: P-Mentha-1,3,5,8-tetraene is a monocyclic hydrocarbon and a monoterpene.

Taste threshold values

Taste characteristics at 2.5 ppm: spicy, balsamic, musty, and eugenol/guiacol-like with a nutty nuance.

Synthesis Reference(s)

Journal of the American Chemical Society, 118, p. 3970, 1996 DOI: 10.1021/ja9600486
The Journal of Organic Chemistry, 44, p. 3157, 1979 DOI: 10.1021/jo01332a014
Synthetic Communications, 19, p. 3353, 1989 DOI: 10.1080/00397918908052740

General Description

p,α-Dimethylstyrene has been identified as one of the volatile flavor constituents in litchi, essential oils of distilled Mexican lime and parsley.