Synthesis of Alpha-Peroxylactones by Direct Oxygenation of Ketenes. Evidence for an Intermediate.

摘要

The reaction of ketenes with TPPO at low temperatures provides a facile entry to alpha-peroxylactones. This reaction involves 0 as the reactive oxidizing species and does not result from direct reaction of TPPO and ketene or of reaction of triplet oxygen with ketene. An intermediate (presumably a perepoxide or zwitterion) occurs as precursor to alpha-peroxylactone formation.