Abstract
The natural piperine 1 was photooxygenated using Tungsten-halogen lamp to give 1N-piperidino-1-oxo-5-(3'-formatyl-4'-hydroperoxyl phenyl)-2,4-pentadiene 2a and 1-N-piperidino-1-oxo-5-(4'-formatyl-3'-hydroperoxyl phenyl)-2,4-pentadiene 2b whereas, if the reaction was carried out using sodium lamp a mixture of 2a and b in addition to the cyclicperoxide derivative 3 was obtained.