Aromatics

AROMATICS-AROMA-FRAGRANCE-FLAVOR

An aroma compound, also known as odorant, aroma, fragrance, or flavor, is a chemical compound that has a smell or odor. A chemical compound has a smell or odor when it is sufficiently volatile to be transported to the olfactory system in the upper part of the nose.

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Aldehyde C18
Citral SyntheticeEthyl Maltol
Dihydrocoumarin
Vanillin
Ethyl Vanillin
Vanilla
Peppermint Oil
Menthol Crystal

Ethyl Acetate
Camphor Powder
EucalyptolHeliotropin
Linalool
Maltol
Methyl Salicylate
Mustard flour
Mustard Seed
Strawberry Furanone

The term aromatic derives from the Latin word “aroma”, meaning fragrance. Until into the 19th century, substances were described as aromatics that were principally obtainable from resins or plants and that gave off a pleasant smell.

More accurate scientific tests showed many of these substances to be benzene derivatives. After the concept of aromaticity had been extended in the middle of the 19th century to include first all benzene derivatives, Emil Erlenmeyer suggested using the word “aromatic” for all compounds having similar properties to benzene. The decisive criterion for him was that the compound should tend more towards substitution reactions than towards addition ones.

In 1931 the scientist Erich Hückel achieved a breakthrough in defining the aromaticity of a substance. Named after him, “Hückel’s rule” enables aromatic and anti-aromatic compounds to be distinguished on the basis of the number of π-electrons.
Besides classification, the structure of aromatics – particularly that of benzene – also represents a challenge for the scientific world.
The crucial breakthrough here was achieved by Friedrich August Kekulé of Stradonitz in 1865. He introduced a ring-like structure of benzene, the carbon atoms being interchangingly linked together via simple and double bonds.

Based on the structure developed by Kekulé, Robinson in 1925 proposed the ring symbol for benzene: The π-electrons being delocalised, the benzene molecule is represented as lying between two bordering structures. This delocalisation of bonds at the same time determines the characteristic stability of the benzene molecule – which also distinguishes the other aromatics.

In today’s chemical industry, the BTX aromatics (benzene, toluene and xylene) – largely produced from petroleum – are especially important. Everyday, they help meet fundamental human needs, such as health, hygiene, housing and food; and they are also strong in areas as diverse as transport, high technology, sports, leisure – and even art restoration and crime detection!

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