Kinetic and product study of the thermolyses of several nitrones and O-alkyloximes

The question of the regiodirection of the [2+3] cycloaddition reaction of triphenylnitrone to nitroethene

“…We also confirmed that nitroethene polymerized at high temperatures [3,5]. Simultaneously nitrone 1 was slowly converted into benzophenone [6,7]. Its presence in the reaction mixture was confirmed by HPLC.…”