Acta Cryst. (2005). E61, o1677-o1679  [ doi:10.1107/S160053680501398X ]

The 2-exo,7-exo,9-exo,10-exo isomer of 11-oxatricyclo[6.2.1.0^2,7]undec-4-ene-9,10-diyl diacetate

S. O. Yildirim, M. Akkurt, A. Baran, H. Seçen and O. Büyükgüngör

Abstract: The title compound, (2-exo,7-exo,9-exo,10-exo)-11-oxatricyclo[6.2.1.0^2,7]undec-4-ene-9,10-diyl diacetate, C₁₄H₁₈O₅, was synthesized in the same way as its 9-endo,10-endo isomer. The X-ray study showed that the Diels-Alder reaction of 5-exo,6-exo-diacetato-7-oxabicylclo[2.2.1]hepta-2-ene with 3-sulfolene, a protected 1,3-butadiene, yields the 2-exo,7-exo product, i.e. reacts in the same way as the 5-endo,6-endo isomer of the starting compound. Intermolecular C-HO interactions link the molecules into infinite chains extending along the b axis of the monoclinic crystal structure.

Online 14 May 2005

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