ent-Daucane and acorane sesquiterpenes from x Cupressocyparis leylandii foliage.

One new ent-daucadiene and enantiomers of four previously reported daucadienes or acoradienes were identified in foliage of the hybrid cypress species xCupressocyparis leylandii. The major compound is (+)-dauca-5,8-diene; minor congeners are (-)-dauca-4,8-diene, (-)-dauca-8,11-diene, (-)-acora-3,7(14)-diene and 1S-dauca-4(11),8-diene. None of these compounds is observed in foliage of either of the parent species, Cupressus macrocarpa and Chamaecyparis nootkatensis. However, we have subsequently found them in some specimens of Cupressus macnabiana.