A new naturally occurring linear sesquiterpene (tanacetene) (1). having irregular
non-head- to- tail attachment of isoprene units, a new long chain ester (2). and 10
known compounds have been isolated from hexane and chloroform extracts of the roots
and aerial parts of Tanacetum longifolium wall. The structure of (tanacetene) (1).
was established as (2E,6E,10E)-2,6,11-trimethyl-dodeca-2,6,10-triene and that of (2).
as heptatriacontanyl eicosanoate by spectroscopic methods along with 10 known compounds.
From the oily fraction twelve volatile compounds were identified by GC-MS. The roots
of this plant were found to be a new major source of Z-spiroketalenol ether-6,7-epoxy-diyne
in 3.2% yield on dry weight basis.