PhCHCHCH3

PhCHCHCH3 is a substituted alkene commonly referred to as β-methylstyrene or 1-phenylprop-1-ene. Its formula is C9H10, and it comprises a vinyl group connected to a phenyl ring on one carbon and a methyl group on the other. The molecule can exist as two geometrical isomers (E and Z) around the carbon–carbon double bond, reflecting the relative positions of the phenyl and methyl substituents.

Structure and properties

The conjugated aryl–alkene system stabilizes the double bond and influences reactivity compared with nonconjugated alkenes. As a vinyl aryl compound, it is typically a colorless to pale liquid at room temperature and behaves as an activated olefin, undergoing typical alkene reactions such as electrophilic addition and radical polymerization.

Synthesis and occurrence

β-Methylstyrene is mainly produced as an industrial intermediate or monomer in polymer chemistry. It can be formed via vinylation or dehydrogenation routes from suitable phenyl- or propyl-containing precursors, and it may appear in mixtures during styrene-related manufacturing processes. It is not a natural product.

Reactions and applications

As a styrene derivative, it readily undergoes radical polymerization to give polystyrene-type materials with a phenyl-bearing side chain. It also participates in electrophilic addition and hydrogenation, and serves as an intermediate in organic synthesis for preparing fragrances, pharmaceuticals, or specialty polymers. Copolymerization with styrene or other monomers is a common application in materials science.

Safety and handling

β-Methylstyrene is a flammable liquid and can irritate skin and eyes. It should be handled with appropriate controls, stored away from heat and oxidizers, and used in a well-ventilated area with appropriate personal protective equipment.