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 com is (a, aa, or na).

Explanation / Answer

Rules:

- must be plana

- must have all pi conjguated electrons

- must apply huckel rule = 4n +2; 2,6,10 etc

Q1.

this is planar, but huckel rule does not applies, since there are only 2*2 = 4 bonds in the ring, this is AA

Q2.

this is NOT planar, thereofre not even antiaromatic, this msut be Nonaromatic

The Carbon bodned to the CH3 is tetrahedral, so this can't be aromatic

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