Is vanillin an aldehyde or a ketone

Aldehydes

Aldehydes are organic compounds that contain an aldehyde group -CHO. Here are a few examples of aldehydes:

Formaldehyde, acetaldehyde and 2-methyl-undecanal belong to the alkanals within the aldehydes, i.e. to the aldehydes derived from an alkane.

  • Formaldehyde is derived from methane and is therefore also called methanal. Methanal is the simplest aldehyde of all, it basically consists of a carbonyl group that is connected to two hydrogen atoms.
  • Acetaldehyde, or ethanal, derived from ethane, is the second simplest aldehyde. In the human metabolism, ethanal is formed when ethanol is broken down.
  • 2-methyl-undecanal is derived from 2-methyl-undecane. This connection became known because it is an important component of the famous Chanel NÂș 5 perfume.

The other four aldehydes in the figure do not belong to the alkanals, they are more complex and contain a benzene ring apart from citral A.

  • Benzaldehyde is the simplest aromatic aldehyde. It occurs, among other things, in white wine and determines the aroma of the wine. Apart from that, benzaldehyde is harmful to health.
  • Vanillin is the most important flavoring substance in spiced vanilla.
  • Cinnamaldehyde is the main flavoring of the bark of the cinnamon tree.
  • Finally, citral, our last example of aldehydes, is a fragrance found in tomatoes, among other things.