Composition and chemical variability of the bark oil of Cedrelopsis grevei H. Baillon from Madagascar

A commercial sample of Cedrelopsis grevei H. Baillon from Madagascar was repeatedly chromatographed and the combined analysis of all the fractions by GC, GC–MS and 13C‐NMR led to the identification of 114 components. The major constituents were (E)‐β‐caryophyllene (9.3%), α‐copaene (7.7%), α‐selinene (5.8%), δ‐cadinene (4.9%), β‐selinene (4.5%), α‐humulene (3.3%) and β‐bisabolene (2.8%). Analysis of five other commercial samples confirmed the pre‐eminence of sesquiterpene hydrocarbons and exhibited a variation in the contents of the main components: ishwarane (1.0–17.4%), (E)‐β‐caryophyllene (1.3–12.5%), α‐copaene (4.9–11.0%), β‐elemene (0.2–9.6%) and α‐selinene (1.1–9.4%).