A cation-radical in liquid sulfur dioxide. Polymerization of styrene by anthracene in the presence of oxygen.

One‐electron transfer initiated polymerization reactions I. Initiation through monomer cation radicals

“…(103-104). (104) Styrene in liquid sulfur dioxide readily polymerizes t o polystyrene on the addition of aromatic hydrocarbons such as anthracene and trans-or cis-stilbene in the presence of oxygen (81,105). The cationic nature of the propagating reaction is shown by the formation of polystyrene rather than styrene polysulfone and inhibition on the addition of dimethyl sulfoxide.…”

Polymerization of isobutylene by radical cation initiation

“…It h a s been reported recently that some polymerization reactions a r e believed to b e initiated by radical cations. They a r e t h e polymerization of N-vinylcarbazole by p-chloranil and other c a t a l y s t s (l), and that of styrene by anthracene and oxygen in liquid sulfur oxide (2). W e wish to report on a polymerization which is very likely to b e initiated by rad i c a l cation.…”

Bis-1,3-dithiolium Salts as Initiators for the Cationic Polylnerization of Vinyl Monomers

“…A radical cation of anthracene generated by the reaction of anthracene with oxygen in sulfur dioxide, can initiate the cationic polymerization of styrene. 3 However, this radical cation is not stable enough to be isolated. I recently reported a convenient method for synthesis of 1, in high yield, with some anions by the selective one-electron oxidation of TTF.…”