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It will be understood in future that a phenol is a hydroxy-derivative of a benzenoid hydrocarbon.

The molecule is aromatic but not benzenoid; however, by the reduction of one half of the molecule, the other assumes a benzenoid character.

We are still without any evidence as to the possible transition of the hexoses to benzenoid compounds.

In other words, we might have had to wait till 1965 to reach our present state of knowledge concerning the theory of benzenoid compounds if the coal-tar industry had not been in existence.

These oxygen derivatives of benzenoid hydrocarbons form a special group of compounds known as quinones.