The 2-Exo,7-Exo,10-Exo Isomer of 11-Oxa-Tricycolo[6.2.1.0(2,7)]Undec-4-ene-9,10-diyl Diacetate

Abstract

The title compound, (2-exo,7-exo,9-exo,10-exo)-11-oxatri-cyclo[6.2.1.0 2,7]undec-4-ene-9,10-diyl diacetate, C<inf>14</inf>H<inf>18</inf>O5, 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 - H⋯O interactions link the molecules into infinite chains extending along the b axis of the monoclinic crystal structure. © 2005 International Union of Crystallography Printed in Great Britain - all rights reserved.