A novel photochemical conversion of 1,7,7-trimethyl-3-(E-2′-arylethenyl)-2-oxabicyclo[4.4.0]deca-3,5-dienes (6a–c) into the corresponding endo-1,7,7-trimethyl-11-aryl-tricyclo[4.4.0.12,4]undec-5-en-3-ones (7a–c) in high yield (75–80%) is reported.
R. P. Gandhi and R. C. Aryan, J. Chem. Soc., Chem. Commun., 1988, 1024 DOI: 10.1039/C39880001024
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