What are aroma chemicals

Aromatic compound is a kind of compound with aromatic ring structure. They are stable in structure, not easy to decompose, and may cause serious pollution to the environment. Historically, a class of aromatic substances obtained from vegetable gums was called aroma chemicals. aroma chemicals generally refer to cyclic compounds containing at least one delocalized bond in the molecule, but there are examples of modern aroma chemicals that do not contain a benzene ring. aroma chemicals all have "aromaticity".

Modern aromatics refer to a class of compounds that contain at least one benzene ring with a delocalized bond in the hydrocarbon molecule, and have unique properties (called aromaticity) different from open-chain compounds or alicyclic hydrocarbons. Such as benzene, naphthalene, anthracene, phenanthrene and its derivatives. Benzene is the simplest and most typical representative. They are prone to electrophilic substitution reactions, are relatively stable to heat, and are mainly derived from petroleum and coal tar.