Abstract
Under UV-irradiation in a neutral medium (E)-3'-acetoxy-2'-hydroxy-2', 3'-dihydro-α-ionone afford-ed a mixture of (Z)-3'-acetoxy-2'-hydroxy-2', 3'-dihydro-α-ionone, 3'-acetoxy-retro-γ-ionone, (E)-3'-acetoxy-β-ionone and 10-acetoxy-1, 3, 7, 7-tetra-methyl-2-oxabicyclo[4. 4. 0]deca-3, 5-diene, in acidic medium a cyclized compound, 10-acetoxy-5-me-thoxy-1, 3, 7, 7-tetramethyl-2-oxabicyclo[4. 4. 0] dec-3-ene, and in basic medium a mixture of two cyclized compounds, 10-acetoxy-3-hydroxy- and 3, 10-dihy-droxy-1, 3, 7, 7-tetramethyl-2-oxabicyclo [4. 4.0] dec-5-ene.
