For each of the species below, identify any cyclic conjugated system, then: Dete

Question

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

Explanation / Answer

Rules

- must be planar

- Must have Pi electrns

- Hyuckel rule must apply 4n+2 = 2,6,10, 14..

Q1

Number of pi electron = 2*2 = 4, it can take 2 frm N so 4+2 = 6 electrns in conjguated system

it is lanar, therefore this is Aromatic

Q2

This is planar, t has 2 electrns (1 double bond)

n = 2

it applies huckel rule

It is NOT conjugated

so this is Antiaromatic!

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