''alpha''-Methylstyrene

alpha-Methylstyrene

Names
IUPAC name Isopropenylbenzene
Other names α-Methylstyrene; 2-Phenyl-1-propene; 1-Methyl-1-phenylethylene; 2-Phenylpropene; (1-Methylethenyl)benzene; beta-Phenylpropene; 2-Phenylpropylene; beta-Phenylpropylene; alpha-Methylstyrol; 1-Phenyl-1-methylethylene; 2-Phenyl-2-propene
Identifiers
CAS Number	98-83-9 Y
3D model (JSmol)	Interactive image Interactive image
Abbreviations	AMS
ChemSpider	7129 Y
ECHA InfoCard	100.002.459
KEGG	C14395 Y
PubChem CID	7407
InChI InChI=1S/C9H10/c1-8(2)9-6-4-3-5-7-9/h3-7H,1H2,2H3 Y Key: XYLMUPLGERFSHI-UHFFFAOYSA-N Y InChI=1/C9H10/c1-8(2)9-6-4-3-5-7-9/h3-7H,1H2,2H3 Key: XYLMUPLGERFSHI-UHFFFAOYAS
SMILES C=C(c1ccccc1)C CC(=C)c1ccccc1
Properties
Chemical formula	C9H10
Molar mass	118.18 g·mol−1
Appearance	Colorless liquid
Density	0.91 g/cm3
Melting point	−24 °C (−11 °F; 249 K)
Boiling point	165 to 169 °C (329 to 336 °F; 438 to 442 K)
Solubility in water	Insoluble
Vapor pressure	2 mmHg (20 °C)[1]
Magnetic susceptibility (χ)	-80.1·10−6 cm3/mol
Hazards
NFPA 704	0 3 0
Flash point	45 °C (113 °F; 318 K)
Explosive limits	1.9%-6.1%[1]
Lethal dose or concentration (LD, LC):
LD50 (median dose)	4900 mg/kg (oral, rat)[2]
US health exposure limits (NIOSH):
PEL (Permissible)	C 100 ppm (480 mg/m3)[1]
REL (Recommended)	TWA 50 ppm (240 mg/m3) ST 100 ppm (485 mg/m3)[1]
IDLH (Immediate danger)	700 ppm[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

α-Methylstyrene (AMS) is a chemical intermediate used in the manufacture of plasticizers, resins and polymers.^[3] It is a co-product formed in a variation of the cumene process. The homopolymer obtained from this monomer, poly(α-methylstyrene), is unstable, being characterized by a low ceiling temperature.

References