1969/01/01 by R. L. Huang, Tong-Wai Lee, S. H. Ong · 1 citation
Chemistry · #Free Radicals and Antioxidants #Oxidative Organic Chemistry Reactions #Chemistry #Benzaldehyde #Carbon tetrachloride #Solvent #Radical #Photochemistry #Ether #Organic chemistry #Diethyl ether #Pentane #Medicinal chemistry #Catalysis
paper · doi:10.1039/j39690000040
openalex publication_date 1969/01/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/06/11
The α-methoxybenzyl radical, generated from benzyl methyl ether at 110° by the action of t-butoxy-radicals (from di-t-butyl peroxide) in an excess of the ether as solvent, undergoes mainly dimerisation, and breaks down to benzaldehyde to a small extent. In the presence of carbon tetrachloride as solvent, the radical in part breaks down, and in part abstracts a chlorine atom from the solvent to form Ph·CHCl·OMe which at 110° suffers thermolysis to benzaldehyde, but which can be isolated if the reaction is carried out at 60°(using t-butyl hyponitrite as the source of t-butoxy-radicals). Evidence is presented to show that, with carbon tetrachloride as solvent, the main hydrogenabstracting radical is the trichloromethyl radical. In pentane, octane, and hexadecane as solvent, the tendency of the radical to undergo dimerisation, which is the preponderant reaction, increases with increasing viscosity of the solvent. In diphenyl ether, diphenyl monosulphide, and tetrachloroethylene, however, the radical suffers extensive breakdown to benzaldehyde. This behaviour is attributed to complexing of the radical with these latter solvents, rendering dimerisation more difficult.