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In furan, the oxygen atom is spÂ² hybridized. One lone pair is in the Ï system and the other in the plane of the ring (analogous to C-H bond on the other positions). There are 6 Ï electrons, so furan is aromatic.he circulating Ï electrons in an aromatic molecule produce ring currents that oppose the applied magnetic field in NMR. The NMR signal of protons in the plane of an aromatic ring are shifted substantially further down-field than those on non-aromatic spÂ² carbons. This is an important way of detecting aromaticity.