Essential oil ofSantolina rosmarinifolia L. ssp.rosmarinifolia: first isolation of capillene, a diacetylene derivative

Capillene (1-phenylhexa-2,4-diyne) was found to be the main constituent (35.2%) of the essential oil of Santolina rosmarinifolia L. ssp. rosmarinifolia. The related ketone capillin (1-phenylhexa-2,4-diyn-1-one, 0.4%) was also found. The reset of the oil was made up of monoterpenes (53.3%) and sesquiterpenes (9.6%). The main monoterpenes were: β-phellandrene (14.9%), myrcene (13.1%), β-pinene (7.8%) and sabinene (5.5%), while the principal sesquiterpene was ar-curcumene (4.3%).