Cp. Brock et al., PRODUCT OF A PATERNO-BUCHI REACTION OF PENTAFLUOROBENZALDEHYDE AND 4-TERT-BUTYL-1-ACETOXYCYCLOHEXENE, Acta crystallographica. Section C, Crystal structure communications, 50, 1994, pp. 1345-1347
The stereochemistry of the product of the photoaddition of pentafluoro
benzaldehyde to 4-tert-butyl-1-acetoxycyclohexene, tert-butyl-8-pentaf
luorophenyl-7-oxabicyclo[4.2.0] oct-1-yl acetate, C19H21F5O3, has been
established. The ring fusion is cis, and the aryl and acetoxy substit
utents are trans to the tertiary butyl group.