Technical detail
At nine carbons, Aldehyde C-9 occupies the lighter end of the classic aliphatic aldehyde range. Its olfactive profile combines a green, grassy, slightly rose-like quality with the characteristic waxy fatty facet of the series. It occurs naturally in trace amounts in many citrus and floral essential oils, giving its use in perfumery a naturalistic effect even when synthetically sourced (IFRA ingredient data, accessed 2026-05-27).
Compared to C-10 and C-12, C-9 is used less frequently in canonical aldehydic florals but appears more often in chypre and green floral structures where its lighter, more herbaceous quality adds freshness. It is also found as a trace contributor in rose absolute reconstructions (Basenotes molecule guide, accessed 2026-05-27).
Examples
- Green floral chypres: Aldehyde C-9 contributes green naturalness to the fresh top layers.
- Rose reconstructions: trace C-9 adds a naturalistic waxy-green facet to synthetic rose accords.
- Often found alongside C-10, C-11, C-12 in the classic aldehyde palette of pre-1940 French perfumery compositions.