Photo Reactions of Esters and Photodeprotection

3 nioto Reactions of Esters and Photodeprotection - Laser irradiation at 183 nm of a series of alkyl acetates has been reported. The aryl phenylacetates (105) undergo photo-Fries reactions when irradiated in acetonitrile solution. The reactivity is appreciably more selective when they are irradiated within the cavities in NaY zeolites. Under these conditions only the ortho photo-Fries product is formed. The oxime derivative (106) undergoes N-O bond fission when the compound is irradiated on a micellar surface. Such bond fission results in 

A new method has been described for the protection of amino acids with a photoremovable group. This procedure involves the conversion of the amino acid into the phenacyl derivative (114). Irradiation of (114) in a buffered aqueous 

---