For each of the species below identify any cyclic conjugated system, then: A. De

Question

For each of the species below identify any cyclic conjugated system, then: A. Determine the number of electrons in a system of cyclic conjugation (zero if no cyclic conjugation). B. Specify whether the species is "a" - aromatic, "aa" - anti-aromatic, or "na" - non-aromatic (neither aromatic nor (Presume rings to be planar unless structure obviously prevents planarity. If there is more than one conjugated in the largest.) A. Electrons in a cyclic conjugated system. 2 B. The compound is (a, aa, or na) na A. Electrons in a cyclic conjugated system. 8 B. The compound is (a, aa, or na) aa

Explanation / Answer

1)

A) Electrons in a cyclic conjugated system = 2

According to Huckel's rules, [4n+2] = 2 pi eletrons

4n = 2-2 = 0

n = 0 so it is aromatic

B) The compound is aromatic.

2)

A) Electrons in a cyclic conjugated system = 8

B) The compound is anti aromatic.

According to Huckel's rules,

4n = 8 pi electrons

n = 8/4 = 2

Therefore, it is anti aromatic.

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