different between bicyclic vs oxabicyclic

English

bi- +? cyclic

bicyclic (not comparable)

Having two cycles.
(chemistry) Having two rings of atoms in the molecule; the rings may be fused, as in naphthalene, or separate, as in biphenyl.

bicyclic (plural bicyclics)

oxa- +? bicyclic

oxabicyclic (not comparable)

(organic chemistry) Describing a bicyclic compound having a bridging oxygen atom.
Aldrichimica Acta Volume 30 No 4 (pdf) from Sigma-Aldrich
These oxabicyclic systems are very versatile intermediates in organic synthesis and have been prepared typically in racemic form by the [3 + 4] annulation between allyl cations and furans.

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