A novel photolabile protecting group, thiochromone S, S-dioxide, possessing the 1, 2-diol group for protection of ketones and aldehydes is described. Photodeprotection of the successfully protected carbonyl derivatives proceeded smoothly under photoirradiation filtered through Pyrex glass (> 280 nm) using an ultrahigh-pressure mercury lamp to recover the corresponding carbonyl compounds and the starting protecting group.
![3-phenyl-2-(1,4-dioxaspiro[4.5]decan-2-yl)-4H-thiochromen-4-one 1,1-dioxide结构式](https://image.chemsrc.com/caspic/192/1187758-91-3.png)
