Synthesis and Conformation of Some Dioxaspiranes with Bicyclo [2.2.2]octane System
By condensation of 7,7‐bis‐(bromomethyl)‐2,3,5,6‐dibenzo‐bicyclo[2.2.2]octane with different diols, three new “bridge‐spiranes” 1, 2 and 3 were obtained. On the basis of 1H‐n.m.r. spectra and the respective topic relations of the hydrogen atoms the dominant conformations of heterocyclic rings in these compounds have been assigned.
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