Aldehydes play an important role in biochemical processes of life. They add fragrance and flavour to nature, for example, vanillin (from vanilla beans), salicylaldehyde (from meadow sweet) and cinnamaldehyde (from cinnamon) have very pleasant fragrances.

The carbonyl compounds in which carbon of carbonyl group is bonded to carbon or hydrogen and oxygen of hydroxyl moiety (-OH) are known as carboxylic acids, while in compounds where carbon is attached to carbon or hydrogen and nitrogen of ...

Aldehydes contain the carbonyl group bonded to at least one hydrogen atom. Ketones contain the carbonyl group bonded to two carbon atoms. Aldehydes and ketones are organic compounds which incorporate a carbonyl functional group, C=O.

Anisole reacts with a mixture of concentrated sulfuric and nitric acids in nitration, yielding a mixture of ortho and para nitroanisole as the product.

Anisole undergoes Friedel-Crafts reaction with alkyl halide and acyl halide in the presence of anhydrous aluminum chloride as a Lewis acid catalyst. The reaction introduces the alkyl and acyl groups at ortho and para positions.