Occh3

thymohydroquinone thymoquinone carvacrol acetate thymol acetate thymohydroquinone thymoquinone

Figure 3.9 Most common cymyl-compounds found in Origanum spp.

O. hypercifolium O. Schwarz et P.H. Davis were found to be rich in p-cymyl compounds (Baser et al, 1992, Baser et al.,1994a) while O. libanoticum Boiss (Arnold et al., 2000) is rich inp-cymyl and sesquiterpenoid compounds. Thus, it seems that in both these sections taxa are characterized by the p-cymyl monoterpenoids. In section Brevifilamentum, O. acutidens Ietswaart was rich in carvacrol while O. bargyli Mouterde, O. haussknechtii Boiss. and O. leptocladum Boiss. were found to be rich in p-cymyl compounds and borneol (Baser et al., 1997a, Baser and Duman, 1998; Baser et al, 1998a; Baser et al, 1996a). O. rotundifolium Boiss. contains mainly cis-sabinene hydrate, linalyl acetate, a-terpineol, ^-caryophyllene, and trans-sabinene hydrate (Baser et al., 1995) and the newly found species O. husnucan-baserii H. Duman, Z. Aytag et A. Duran contains borneol, cis- and trans-sabinene hydrate, j6-caryophyl-lene and germacrene-D (Baser et al., 1998b). It is only in the section Brevifilamentum that there is a large accumulation of borneol in the volatile compounds, while sesquiterpenoids are present too. In the whole group A, only O. rotundifolium and O. husnucan-baserii tend to accumulate sabinyl compounds instead of cymyl as in the other 13 analyzed taxa. In group A, taxa are characterized by a poor essential oil yield (<0.5 per cent) (Table 3.4).

thujene sabinene sabinene

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