
Alpha Methylstyrene (MF: C9H10, MW: 118.18), features a molecular structure where a phenyl ring is connected to an allyl group. It belongs to the class of aromatic olefins and serves as a crucial organic chemical monomer. The presence of a carbon-carbon double bond in its molecule facilitates homopolymerization or copolymerization reactions. Due to its benzene ring, it undergoes Friedel-Crafts alkylation, acylation, and other aromatic substitution reactions; however, the double bond confers higher reactivity than pure benzene.
| Item | Specification |
| Melting point | −24°C (lit.) |
| Boiling point | 165–169°C (lit.) |
| Density | 0.909 g/mL at 25°C (lit.) |
| Vapor density | 4.1 (vs air) |
| Vapor pressure | 2.1 mmHg (20°C) |
| Refractive index | n20/D 1.539 |
| Flash point | 114°F |
| Solubility | Easily soluble in organic solvents such as ethanol, diethyl ether, and benzene; slightly soluble in water. |
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