Aldehyde C-11 Undecylenic

Other comments :

Aldehyde C-11 Undecylenic is greener and less zesty-lemon than Aldehyde C-11 Undecylic. Aldehydes C-12 are more orange and less butyric. C-8 is less green.

Stability :

Aldehydes may form diethylacetals in alcoholic perfumes, with no real impact on their smell

Uses in perfumery :

Aldehyde C-11 Undecylenic provides an aldehydic facet in green, chypre, rose, floral-violet, tuberose notes. Used in detergents for its stability.

Year of discovery :

Data not available.

Isomerism :

Ethyl Linalool is a constitutional isomer of Aldehyde C-11 Undecylenic. Its smell is however much more floral-fresh and less zesty.

Synthesis precursor :

Aldehyde C-11 undecylenic forms a Schiff base by reaction with Methyl Anthranilate or Indole, for example. It can also be used for condensation with another aldehyde or ketone to form the desired alcene.

Natural availability :

Aldehyde C-11 Undecylenic has been identified as present in trace amounts in Coriander Leaf EO, but is not extracted in its natural state.

Synthesis route :

Like the other aliphatic aldehydes, Aldehyde C-11 undecylenic, can be synthesized by a reaction of undecylenyl halides (chloride, for example) with dimethyl sulfoxide (DMSO), followed by an alkaline treatment with sodium bicarbonate. Other synthetic routes exist, such as a reduction of Rosenmund from undecylenic acid, using an acid chloride.