A facile oxidation and oxygen insertion of the cyclopentadiene ring by molecular oxygen in solution.
[reaction: see text] Oxidation of substituted cyclopentadienes by molecular oxygen afforded the corresponding pyrylium cations in acidic solution, whereby an oxygen atom was inserted into the cyclopentadiene ring. This novel one-step reaction proceeds in a different yield depending on substitution patterns of the cyclopentadiene. A possible reaction pathway and formation mechanism of the pyrylium cation are proposed and discussed.
Gong
Wei-Tao
WT
State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116012, PR China.
Ning
Gui-Ling
GL
Li
Xin-Cheng
XC
Wang
Li
L
Lin
Yuan
Y