13. Cycloheptatriene is not aromatic, but the boron containing ring shown below, where one carbon is replaced by boron, is aromatic. Explain why replacing carbon with boron allows aromaticity. (Hint: think of the Lewis dot structure) not aromatic aromatic
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Step 1: In cycloheptatriene, the ring has 7 carbons with alternating double bonds, but it is not aromatic because it does not follow the criteria for aromaticity. Show more…
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(a) Why is furan aromatic? Draw a picture showing the two atomic orbitals for the two lone pairs on the oxygen, using the "side-on" view of furan below. Then, use that picture to explain why furan is aromatic, not antiaromatic. (4 points) furan "side-on" view (b) Pyrrole (left) is quite aromatic. But the phosphorus analogue is much less aromatic, and the arsenic analogue is essentially non-aromatic. What might be changing, going down the periodic table, that would reduce the aromaticity of the ring? Why? (2 points)
Adi S.
The structure shown below is not aromatic since all carbons have orbital delocalization of the electrons. It is aromatic since there are 4n+2 electrons in each ring. It is not aromatic since each ring has only 2 electrons. Aromaticity is never present in fused multi-ring structures.
The molecule given above is (a) aromatic (b) non-aromatic because it does not satisfy Huckel rule of aromaticity. (c) non-aromatic because its electron distribution is not uniform. (d) non-aromatic because there are two trans double bonds which force the molecule out of planarity.
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