Cumene

Cumene (isopropylbenzene) is an organic compound that contains a benzene ring with an isopropyl substituent.

The original route for manufacturing of cumene was by alkylation of benzene in the liquid phase using sulfuric acid as a catalyst, but because of the complicated neutralization and recycling steps required, together with corrosion problems, this process has been largely replaced.

As an alternative, solid phosphoric acid (SPA) supported on alumina has been used as the catalyst.

The tendency of cumene to form peroxides by autoxidation poses safety concerns.

Cumene is frequently found as an ingredient in thread locking fluids.

Skeletal formula of cumene
Ball-and-stick model of the cumene molecule
NFPA 704 four-colored diamond Health 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroform Flammability 3: Liquids and solids that can be ignited under almost all ambient temperature conditions. Flash point between 23 and 38 °C (73 and 100 °F). E.g. gasoline Instability 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g. calcium Special hazards (white): no code
Reaction of benzene with propylene to give cumene in the presence of phosphoric acid supported on silica and promoted with boron trifluoride
Reaction of benzene with propylene to give cumene in the presence of phosphoric acid supported on silica and promoted with boron trifluoride