Hydrogen peroxide oxidation of polysubstituted pyrylium salts: formation of enol esters and furans

Biofest: Bioinspired Chemistry, Biomaterials and Bioelectrochemistry

Bio, bio, bio! This issue features the latest advances in bioinspired chemistry, biomaterials and bioelectrochemistry. Containing both original research and informative review articles, it is a must read for those committed to a multidisciplinary approach to these bio-orientated fields/topics.

Versatility of Pyrylium Salt/Vinyl Ether Initiating System for Epoxide Dual-Cure Polymerization: Kick-Starting Effect of the Coinitiator

Pyrylium salts combined with vinyl ethers are shown to act as new versatile dual-cure initiating systems for both photochemical and thermal initiation of oxirane monomers. The combination of both possibilities allows the curing of thick samples through photoinduced frontal polymerization. On the basis of quantum calculations and photochemical experiments, some clues are given about the reaction mechanisms involved. Interestingly, a sequential kick-starting effect is observed in the presence of vinyl ether enabling the curing of oxetane monomers. Thereby, this communication presents a short overview of potential of pyrylium salts in cationic polymerization of oxiranes.

Mechanistic approach to a photochemical/thermal dual-cure initiating system based on pyrylium salt–hydroperoxide for epoxide cationic polymerization

An initiating system based on pyrylium salts and the hydroperoxide group is a promising method to perform a dual-cure of epoxides via cationic polymerization.