Table 1 Example of aromatic or non-aromatic choices made for the representation of several compounds with arguable aromaticity

Pyrrole

c1ccc[nH]1

Thyophene

c1cccs1

Cyclopentadiene

C1=CC=CC1

Cyclopentadienyl anion

[cH-]1cccc1

Cyclopentadienone

c1(=O)cccc1

2-pyridone

c1(=O)[nH]cccc1

Uracil

C1(=O)NC(=O)NC=C1

Pyridine oxide

c1ccccn=O

Quinone

O=C1C=CC(=O)C=C1

Anthraquinone

c12ccccc1C(=O)c1ccccc1C2(=O)

9-Methylene-fluorene

c12ccccc1C(=C)c1ccccc12

Imidazolidene metal carbene

[Ni]=C1N(C)C=CN1C

\(\hbox {C}_{60}\)

c12c3c4c5c1c1c6c7c2c2c8c3c3c9c4c4c%10c 5c5c1c1c6c6c%11c7c2c2c7c8c3c3c8c9c4c4c 9c%10c5c5c1c1c6c6c%11c2c2c7c3c3c8c4c4c 9c5c1c1c6c2c3c41

A tetramethyl derivative of C\(_{60}\)

C12(C)C3C4(C)c5c1c1c6c7c2c2C8(C)C=3C3 (C)c9c4c4c%10c5c5c1c1c6c6c%11c7c2c2c7c 8c3c3c8c9c4c4c9c%10c5c5c1c1c6c6c%11c2c 2c7c3c3c8c4c4c9c5c1c1c6c2c3c41