Valensene

Valensene is a naturally occurring organic compound classified as a sesquiterpene. It is a bicyclic hydrocarbon with the chemical formula C15H24. Valensene is found in the essential oils of various plants, most notably in the peel of oranges, where it contributes to the characteristic aroma. It can also be found in other citrus fruits and some herbs.

The compound exists as several stereoisomers, with the most common being alpha-valensene and beta-valensene. These isomers can differ slightly in their physical properties and aroma profiles. Valensene is a colorless to pale yellow liquid at room temperature with a terpene-like, somewhat citrusy scent. Its volatility and aroma make it a component of interest in the fragrance and flavor industries.

In perfumery, valensene is used as a fragrance ingredient to impart citrusy and woody notes. Its presence in orange oil also contributes to the overall flavor profile of orange-derived products. While primarily known for its sensory properties, research has explored other potential applications for valensene, including its possible role as an insect attractant or repellent, and its presence in plants has been linked to defense mechanisms. Its biosynthesis in plants involves the mevalonate pathway or the methylerythritol phosphate pathway, common routes for terpene production.