Dye sensitized photooxygenations of 5-amido-1-naphthols were investigated with artificial light and sunlight, and the corresponding 5-amido-1, 4-naphthoquinones were isolated in moderate to excellent yields. Under sunny conditions the yields were higher for almost all cases studied. The energy demand of the equipment used was determined, revealing significant energy savings for solar exposures.
![(Z)-3-(4-chloro-2,5-dimethoxyanilino)-2-[4-(4-methoxyphenyl)-1,3-thiazol-2-yl]prop-2-enenitrile Structure](https://image.chemsrc.com/caspic/125/5813-59-2.png)